We just lost a 2021 6.2 motor on a GMC Yukon Denali at 31,500 miles. They told me it was a Cam Shaft issue and replaced the motor under warranty. The engine made a light ticking sound for about 20 minutes before total failure at low speeds. No light on the dash or codes were ever thrown before it fell apart. Love this channel because I learn a ton.
@@DavidBrown-jt7yi So sorry señor David …it’s a shame on those car makers I really don’t know what is happening with them I still remember when you see a commercial of a truck “ Like a rock “ and you feel completely confident that you own a truck that is reliable but right after the 2005 truck models all the reliable ones just went down the drain 😫😫
@@uptownsamcv Gosh 😫😫a Corvette…those should be a top notch quality car I don’t like to hear about any vehicle getting broken down even if they are not mine
That no code thing is the stuff of nightmares. I’ve had misfires before that I couldn’t believe didn’t throw a check engine light on the dash. Scan tool produced nothing also.
@@munozinni it was a Z51 with a 6 speed, first year 6.0 with D.O.D. issues that also caused oil pressure drop. the shop that was working on it recommended just dropping in an Escalade engine which are aluminum with an aftermarket cam. he ended up selling it cheap to someone that wanted it for a build.
It all sounds expensive, but it also gives them comfort, knowing that their vehicle is being cared for by professionals. You guys are absolutely amazing.
I'm saying stuck lifter since the problem just started overnight. Cam going flat isn't going to happen overnight. Also, I'm with the group that checks plugs, wires, coils first. Then the compression test. Love this channel ! Dave and crew seem to be the most honest and upfront of any shops that I know of. Good hearted folks!
Yep, a can slowly going away WILL result in subtle problems, like light back firing and missing, starting at only light throttle WAY before it gets real bad, for at least several weeks in advance, and then starts to get worse and worse. A sudden, severe, overnight issue is not a cam going flat
Dump the oil and inspect it and the oil filter for any metallic bits. If the cam's been worn to the point it won't actuate the lifter there should be metal everywhere. If there's no metal then a collapsed lifter is most likely (thought not 100%) the extent of the issue. The information gathered from inspecting the oil/filter will make choosing one of the three described options a lot easier for the client.
@@genehart261 not really upsell when the condition of the engine is unknown, if you pull it out and get it done then theres a warranty on the engine and considering it's done by a machine shop i would prob go with a rebuilt engine, they are legit giving him 3 options lmao
That is what garage floor mechanics do, they guess while looking at the oil in the pan...like it is reading tea leaves..... Real mechanics do the proper disassemble to determine the exact issue. Pulling the valve covers is easy and quick and tells you 100% the issue. Keep guessing GF Mech !!!!!!!!!!! LOL
Dave, first I want to say I love the channel. Guys like you and I are dying breed. Being a semi retired factory trained gold master Porsche Tech specializing in diagnostics. I have the same standard that you that you have. One must prove the problem to get to the root cause before you start throwing parts at it. They don’t train these guys properly anymore. They want to plug an OBD scanner, get the codes and change the part without proving the root cause. IE: parts changers. Love that you are mentoring and training your guys the proper way. Keep up the good work.
AFM Lifter failed- they go bad all the time on GM trucks. Just pull the valve cover off and crank it over, if the rocker arm isn't moving the AFM lifter failed. Sometimes it needs a cam also.
Yep! The fact that GM is still using this PROVEN problematic system is criminal. Most drivers haven't a clue what DoD is cause if they did they wouldn't buy the vehicle in the first place.
Hey man, my dad is a master mechanic, and every time I don't have to ask him for help, I just tell him what I did, brings me the pride that I never got as a kid. Thanks for helping me on my journey, this isn't relevant to my current trail, but I'm gonna put it in my hat for later.
The first thing you do to find a single cylinder misfire is NOT a compression test. The first thing you do is swap the coil from the offending cylinder with that from a known good cylinder. If the misfire moves, then the problem is the coil. If it doesn't move, then you pull and inspect the plug and replace if necessary. If the plug is good but it's not firing, then inspect the electrical system for the fault. If the plug is firing as it should, THEN you do a compression test. You got lucky going straight to the compression test THIS time, but this is a rare failure. Start with the cheapest to fix, simplest to fix, and most likely cause/s first.
Agree with Eddie. The chances of it being compression related is much less likely than a spark plug, coil or fuel injector. Do I want to fight trying to get the compression gauge into cylinder 4 or 8 on any Chevy engine just to find I have a bad coil? No. It’s cheaper for the customer if I use common sense and check the most likely issue first.
Don’t overthink compression testing. Keep it simple. Use relative compression. If you have one dead hole only like in this video, then crank the engine over in clear flood mode. Use your ears and listen to how it turns over. Does it have a consistent cadence to it? Do you hear an uneven rhythm? You can get an idea of where you need to go next based on what you hear before you even start putting tools on things.
Thanks, that’s great advice. Not a mechanic but understand a lot about mechanical devices. Never crossed my mind to check gross compression variances by flood cranking and using my ears.
The government throws money at a problem without finding the cause and a bad mechanic does the same thing with parts. I love your channel keep up the good work. Dave you are the man!!!!!!!!!!!
If the camshaft is still ok, and the rest of the engine is deemed ok, check to see if there are any updated parts for the AFM manifold and valve covers, PCV, or just put a catch-can on it.
I'll never forgive myself for making an old lady pay 300+ on her credit card (cuz she had no other money) because I made the mistake of not realizing the loss of compression her car developed. At the time I was a teenager, worked at few mom n pop shops. Never got any sort of worth while training. Just turned bolts and changed parts (slightly exagerating) but I had gotten away from that and spent some time at an autozone. My manager said hey this old lady just needs some plugs n wires in her corolla if you want the side job. So I'm like ok w/e auto zone don't pay shit sounds easy enough. Noticed the valve cover leaking in around plugs, changed em an seemed to run slightly better. Told her she'd probly need the wires and should soon change valve cover. So I did the wires, again running slightly better. But the entire time I subconsciously thought they're was something wrong with the sound of the engine turning over. By time I was done I did plugs wires and coils and didn't fix it... so not only did I have to deliver the bad news that I didn't fix it, but also that the motor was going to need internal work.. and it was like -20f working outside and could not bring myself to remove and return the parts.. over 15 years ago and still feel terrible... never will that happen again.. diagnose and diagnose more until there's 100%proof of a bad part
Just did a lifter job on 2018 gmc over the summer...81,000 Miles now my son 2016 Tahoe is having the same issue.. GM cylinder deactivating is corporate I believe...
Save the guy some money. Pull the intake. Remove the valley cover. Take a modified 1/4 drive extension and stick it through the dod oil port and give it a couple wacks with a hammer. Should hear the lifter release. Then block the oil port for DOD under the oil pressure sensor and deactivate DOD with a reflash. Good to go after that. Lots of success!
That is what shoud be done. But That pays too little for they anbishion. Its like a doctor saying, it May be treated with medicine But lest open u UP to know what is really happening.
I had a constant misfire on two cylinders, I knew the engine had decent compression , I removed the spark plugs and they stunk of gas so I knew it wasn't fuel injectors, I swapped coil packs and problem was still there so I eliminated coil packs I then tested wires and I saw I wasn't getting enough power to the coil pack signal wire, I got a wiring diagram and tested the wires at the pcm harness and was still no signal, now I'm faced with getting a new pcm😬 thanks Dave for your wisdom you share🙏
After doing this for so long it’s pretty easy to tell if it’s a compression issue..perform a relative compression test if you see a low hole go in cylinder with the transducer and you can see where the compression is going
Option 4…. AFM delete. Better than a new motor with intact but flawed afm. Deal with the cause as Dave says. AFM is most likely the cause of the failure.
I been thru that telling people bad news it's hard to tell someone to bend over because it's going to hurt to fix it right keep up the good work making videos and have a blessed day today 🙏
Last week, I fixed a 2017 ish ford escape with spark plugs. The dealer quoted a short block, saying coolant was in the cylinder. Imagine my surprise when I couldn't get the cooling system to pressurize, and I couldn't find coolant in any of the holes. I swapped coils, misfire stayed, the misfire moved with the spark plug, though. And while waiting for coolant to drip, I saw some dripping from the fuel injector. The customer was happy to pay for new spark plugs and a couple of fuel injectors vs. a short block. Oh yeah, this vehicle had 46k miles on it.
If it's a 1:5, should probably just do the short block for maintenance if it hasn't been done yet. It will fail. At that miles could still be covered under extended coverage recall
If it’s a 1.5L Ecoboost, it likely does need a short block. There a service bulletin for it. I’ve probably done a few dozen when I was at a Ford dealer.
As a VW master tech, 90+% of the misfires we see in small displacement turbocharged European engines are spark plugs or coils. They take less than 5 minutes to confirm. Almost always takes more time to call the customer for authorization than to just test them for free
Exactly. I've seen people do relative compression tests first. Honestly, though, only seen those done on very expensive cars with hard to swap coils/plugs. Depends on the application, depends on what you have. Someone who knows what they are doing can do a compression test with a scope in less than five minutes. But if you can do an rpm drop test easily, sometimes it might take you 10s to find the misfire.
Mechanics today make there paycheck by tossing parts at it. Look how many times they come back to make more money by selling you more parts. Dishonesty is running hard today. Appreciate you honesty in bring back some faith in repairing.
Really today alot mechanics just aren't trained properly and just change parts based in what the computer tells the. They don't know how to do real diagnostics.
Wow great video, I find the hardest part about being a mechanic is trying to explain to customers all the possible solutions for one problem. You guys nailed it, like always. Keep up the great work.
I have a 2009 GMC 2500HD it has a 6.0 Liter Gas engine . I had a lifter stick in the block at 38,000 miles . Of course it was out of warranty so I had to have our local GMC dealership do the work because I am disabled . They put a new long block in it and charged me $ 6,995.99 . They put everything else back on the long block from my original engine , including the WATER pump ! Within less than 500 miles , you guest it right , the water pump went bad . They tried to charge me another $ 795.00 for that , but after threatening to call the BBB they put a new one on it for free ! I LOVE your videos Dave ! ❤
If this is happening to an AFM engine, to where the lifters are failing, should an owner look at removing that entire system? And yes, I learn so much from watching these videos. Dave, his Sons and the entire crew are phenomenal people 👍🏼🙏🙏
We had a 2007 Avalanche for the wife, first year model AFM. As I recall, cylinder number 3 misfire @ 120k ish miles. None of the usual suspects like cam degradation or VLOM failure. Turned out it was a single valve tuliping essentially creating an improper valve seal. Our mechanic was actually able to physically demonstrate the failure with fluid over the inverted head. The leaky valve showed itself immediately, yes rudimentary, but when old school is cool!
Yup --- just left a dealership and we dealt with quite a few of these. The mistake a lot of techs are making is not inspecting the engine fully. They recommend only lifters, push rods, and maybe a rocker arm. Meanwhile the cam is wiped out or worse the bottom end has suffered from an oil filter clogged with metal or one that has hit the bypass and ruined the motor completely. After a while we started letting customers know worst case scenario up front: we may need to replace the motor, warranty or not. Extra note: right before I quit we replaced a 6.2L that had lifter problems. Customer drove on the blinking CEL. I'm talking severe. I pulled this in and the whole shop was looking at me it was that loud. Bottom end was lost: Gold in oil filter. We replaced the motor with one from GM. Brand new. The thing is banging and clacking after a 20 mile test drive. I pull the oil filter and it looks like someone's kid dumped about 5 lbs of gold glitter into the engine oil. Filter internally looks like something from Alice and wonderland with the gorgeous gold color streaks and I took my TIME pre-lubing this engine. GM (GMC) had sent us a SECOND bad engine (Sierra 1500): this vehicle had maybe 15k miles max. The customer was out of their rig for over 3 months. Do NOT buy a new vehicle and take care of your old one. We had to replace the replacement motor.
I had a 2018 suburban. Same. Engine I put about 256k miles on it I had disabled the AFM since new never had a issue always change your oil early 3k or so miles SUV still running like a panther
Hey I just Wana say I love your work it really reminds me of my dad he was just a crazy self trained mechanical genius and he showed me things about motors that I have only seen again on your channel so thank you just a thought he loved the 60s broncos and he put a 429 gt 500 motor in a 66 bronze you should do one of those it was the most insane vehicle I ever rode in
I had 1978 Camaro that I had to change the camshaft. That year had issues with soft cams. One of the lobes wore down enough to barely open the valve. It didn't even mess with the performance oddly enough. The engine sounded normal...no noises like ticking or clattering.
That's why I've been hooked on Scanner Danner videos. Guy shows me every day what I means to truly diagnose an issue thoroughly and not just throw parts at something hoping it works. You get lucky 7/10 times and most shops are fine with that. But they learn and find nothing by just throwing parts at it. And that other 3/10 times? Well, this happens. Or cars get sold to auction and then guys like Scanner Danner come along and literallt bring the car back to life afterike 30mins. Something 10+ shops couldnt figure out. Diagnostics os the future, especially with cars becoming so unreliable and expensive. I trult think that, along with electronics is the way that will weed out the parts changers. Honestly, watched a ScannerDanner video in which a truck with an intermittent misfire got towed to him after visiting multiple other shops. All the guy did to find the fault was a clear-flood crank test. He heard the engine tick every other cycle. Identified what 5 or so shops couldnt in less than 10s. Know your fundamentals!
@@enderlane the computer will get confused sometimes with the misfire. It watches the crank speed and tries to guess which cylinder is causing the misfire.
I used to load up the parts cannon all the time. After many dollars and lots of headaches. I’ve learned to test things first like compression for a misfire
I think part of why people often overlook compression is in part due to the phrase "an engine needs 3 things to run, air, fuel, and spark" my mentor at work had to correct my thinking about this recently because I said that exact phrase to him when diagnosing a miss and he corrected me by saying that compression is the 4th thing.
I dont really post comments on youtube must i must say & appreciate how this is one of the best put together videos iv seen on youtube love it just love it
I remember the day doing all these tune-ups with points and condensers having a lot of fun replacing plug wires and cleaning caps and rotors. It was amazing but a lot of the champion spark plugs that pulled out the the outer electrode was missing. Poor quality control by champion. And they used to be the number one company.
I was at the Chevy dealer on Thursday afternoon and in their shop they had several trucks with the engines out of the vehicle. All had problems one way or the other. Doesn't say much for the brand. In 1993 I bought a brand new Chevy truck that had a miss, I had shown it to a mechanic at work and while it was running he said sounds like a bad camshaft to him. The dealer would not fix it, so I traded it off. We had moved from Florida to Missouri and we took our vehicles to a dealership for oil changes. I went to pick up my wife's car and they told me to bring it back the next day because they were telling me that the engine was leaking oil. So I looked at it at home and all I seen is where the mechanic had spilled oil. I thought to myself that they wanted to charge for another appointment for nothing. That service manager is no longer there, imagine that!
All the haters here either aren't mechanics or they aren't very good ones. A relative compression test should be backed up with a manual one. Either way, you will end up with the valve cover off and the plug out to see WHY you have low compression. Relative or manual makes no difference in the outcome, and there is no time difference when you actually have an issue (because you end up doing both). The options they offer are fine, too. The cheap option is sensible, but it will cost more in the event that the cam is toast. Some people want the engine gone through, some want warranties, and some have money to spend. Looking at the oil filter tells you if you're screwed or probably okay. Probably okay isn't very assuring, and it's guessing. Getting eyes on the camshaft is required for high-quality work. No guessing. Yes, he's in business to make a profit. Yes, he's an engine builder, but note that he also offers the customer budget friendly options. A shady shop doesn't give you options. Keep doing what you're doing, Dave. You set an example for other shops to follow. Most service managers should watch this channel and learn a thing or two.
You can’t give options. You will end up in court. You are an expert. You determine what needs to be done to fix the vehicle and have the repair last longer than the rest of the engine. That is your job and why you are in business. If they want to band-aid it or gamble then let them do that elsewhere. No amount of documentation and explanation will stop you from having some psycho screaming at you and calling you a crook in front of other customers. No relative compression test needed on that. You can hear it’s down while cranking. These valve covers are easier to pull than doing a compression check.
When I was in Auto shop back in the early 70's , The teacher spent the whole class time that day teaching how to read a vacuum gage .That would tell a lot before jumping into needless diagnosis .Today there is so much diagnostic tools out there to find and fix (miss fires) to spin your head around . Miss Fires are caused by a lot of issues ,and it takes a trained skilled mechanic with logic ,scanners and basic tests to find the cause ,with out throwing parts against the wall ,of the past. Scanners don't fix miss fires trained technicians do ,sad there is not a lot out there is some garages (dealerships). Yes compression test tells alot to some techs .
I like Dave's advice on checking misfires, but with a slight tweak. Before doing a compression test, always swap a coil. It's way less labor for the customer, and if it turns out to be a bad coil, this will always confirm it. The customer will appreciate the reduced cost, and plus if the misfire doesn't move, it's even more indication to do a compression test, and doesn't involve any new parts.
I worked at Ford when 6.7 first introduced. Had a misfire on cyl 3. Base engine miss. Found all valves on that cylinder had hairline cracks. Contacted Warranty department and asked for time and labor approval to pull both heads and replace all valves, seals, keepers etc....Ford warranty only approved cyl 3 and thats it lol BS
That’s crazy I can’t tell you how many times I’ve been there.. I like to do everything right if I’m gonna be in there that deep I wanna make sure I get the job done ford don’t think like that obviously
First problem? Late model GM. I'm not bashing GM, but it seems there have been a lot of QC issues over the last 15 years on many GM components and assembly. Just my take. As for this one, as you approach $4k of repairs on a 120k-mile motor, you might as well pull the motor. You can get a GM 6.2 (if that's what in there) remanufactured for about $5.5k. Full warrentee. Just hope you don't start having drivetrain issues. Those transmissions are also on the QC watch list. Another $5.5k. Sigh. Unfortunatly, motor vehicles are a bit disposable. They don't last forever.
Not all vehicles are disposable. Our 19.5 year old Lexus hybrid has never had any reliability issues, and it's more complicated and fuel efficient than most Ford, Chevy, or Dodge vehicles.
A spark plug story from Europe: I bought a new car almost 2 years ago. After about 1.5 yers, I decided to install lpg because 😊. Soon after I tried the lpg, I have seen that it didn't work as on gasoline. After many visits on two lpg services I found out that one of rubber pipe, which is installed between one spark plug and one ignition coil, it had the metal spring too compressed. The sollution was just to stretch it enough to create a little presure on both side: spark plug and ignition coil. That was a happy end after about 3 monts of strugle with lpg.
After being a mechanic for 30+ years, It took the first ten years of my career for that lesson to get burned into head as being routine. A spark plug will not fail prematurely if the compression is within 10% of Specs, and fuel mixture and delivery system are functioning properly, and learning to read those old spark plugs will often work as breadcrumbs pointing you in the right direction
Cam and Lifters went out in my ram at 160k. Instead of just doing the and cam and Lifters I had that motor rebuilt with mds delete and hellcat oil pump. My engine runs like new
How was the sludge in the motor? The VVT system on those engines will beat the crap out of the lifters if you let it. Did you go with better cam or stock? Good choice on the hellcat oil pump.
GREAT VIDEO AS USUAL AS A 65 YEAR OLD MASTER TECH I WAS ALWAYS TAUGHT TO DO A VISUAL INSPECTION BEFORE ANYTHING THEN CHECK FLUID LEVELS THEN CONTINUE DIAG
This is a VERY common problem with the 5.3's from around 2005 on up included the LT series engines. The AFM system eats cams and lifters like candy corn. I used to work at a GM dealership and basically had one tech that was doing cams/lifters and pistons/rings on 5.3s. It was insane.
I've always been interested in cars, I've worked on my cars for 50 years. I also have an Associate Dregee in Automotive Technology. Nobody works on my car but me.
I’ve had several different misfire codes on my vehicles over the years, never because of a dead cylinder. I would always check plugs and coils first and most of the time that was the cause. Plug wires get old and can arc right through the insulation, I’ve had that be the cause of misfire codes twice.
Though I’m by no means an expert, my first thought was, like so many others, something to do with the AFM (or whatever they’re calling it now) system and a bad lifter. I like that a compression test and running it without the valve cover were recommended as alternatives to “throwing parts” at it; I probably wouldn’t have thought of those. I also agree with draining the oil and looking for “forbidden glitter” would be a good step, as well.
I am 62 years old and my sweetest and mot cherished memories are those times spent with my aunt and uncle on their farm. They inspired me, but starting was a problem but with an income of $57k monthly I was able to. My first year farming generated us $142k here in Tynan, TX. We never looked back, agriculture (ranch farming) is a gold mine
Pull the push rod out and use a bore scope to see if the lifter is collapsed, simple first step. You can then rotate the engine to verify if the lifter is collapsed or seized and not moving. I'm sure it's a collapsed lifter as a tore up cam would be very noisy beyond just a misfire due to no intake air and the oil filter would be full of metal shavings.
Hola 👋 señor Dave!!! If I was the truck owner I definitely go with option number three because you guys can make it happen and I know I’m in better hands than Allstate 👀😳I will see you guys in the part deux😊…Saludos!!! Keep up the great content!!!😊
@@Amarillobymorning777 Yes sir !!! With señor Dave you know what you get…he has pride and honesty in his work and business, hard to find these days …if you go to a shop where they do state inspections kind of fishy 👀😳😫and they have a bunch of vehicles parked in or around the shop you better be careful of them because they will change your battery for another old one and they will dig inside the vehicle like drug enforcement if you know what I mean always find a good mechanic and keep it 👋👋
@@munozinni The SUV arrived Now is on a bay open hood Woman owner said : just replace what is need it . Husband said : Nel Open heart surgery. It’s better and they Warranty parts and labor . Let’s see part 2
laughing as i remember friends ecoline van - work van, the irony is, hes a mobile mechanic. he was driving in a stop and go traffic in Ft Worth TX, he heard a bang in the front, he pulled over, and saw sparkplug just hanging there chilling with cable attached. It was extremely hot too. so he waited until it cooled down and fixed it on the spot using the tools in the back. Lucky in my opinion. for normal people. Yeah, I don't know theyd call AAA and rack up all the bills.
Dont bùy ford cheap but invest another half the vehicle priçe. Belt running oil pump??? Wt . One time use oil pan omg. Let the dealers sit with any of the new junk. Buy used resonable .
I had a similar problem with a 2013 silverado. i pulled the valve cover off and the push rod was not moving the rocker arm on cylinder 6 turns out it was a stuck dod lifter. Weird part was there was no lifter tick, no noise at all. But i swapped out the oil pump and with a home made tool i had made i took off the valley cover and stuck the tool in the hole for the lifters where oil passes through and hammered till the lifter got unstuck. Not the right way to do it but it was a quick fix and the cam had not a single scratch 👍🏽
I get when you say you don't give prices for work done because of how long the video will be on TH-cam. However, a simple disclaimer would reveal the price and fully inform us of what the price would be and put the bow on the present. Something like,"This price is good for 30 days, expect increases out of our control". Just a suggestion Davey.
that is exactly what happened at my Mazda dealership, they wanted to change the sparkplugs saying that was the cause, but luckily I had just changed the plugs as routine maintenance (were due at that mileage) so told them no, its something else. ultimately a compression test reevealed an issue that ended up being a burned exhaust valve. 2018 Mazda 6 GT turbo engine. Head ended up being replaced just out of warranty
Ok I have only had 1 job my entire life since 1985 an automotive technician I check every misfire the same and it doesn’t start with a compression test it starts with your scan tool and noid light, cop spark test tool. You go pulling out plugs when the first two are fine unless you’re padding a bill. You guys are always bad mouthing every shop except yours
@PeterAngles-jq7gr Really OP right, especially because these are the quick easy things that can narrow down a common issue before you start checking compression. Even a damned coil swap is a more practical early step before compression. Though in fairness to Dave, his underlying point was properly diagnosing vs parts throwing, in which case we all agree.
One easy way to do a shade tree comparison compression test, is to disable the fuel and ignition and turn it over while recording the audio with a smart phone. You can graph the audio on your phone and "see" the load on each compression stroke. It's the poor man's equivalent to a graphing multimeter with that graphs the load on the starter draw.
This is all great, I have a 2002 4.6 intermittent miss until it gets hot. Coils and plugs improved it, looking at EGR and TPS. No codes. Compression was fine, so not sure what cylinder, lifter or valve.
This is exactly the reason why I got rid of our '10 escalade and bought a 4runner. The 6.2 has potential, but that dreaded AFM has to be completely deleted. Thats an expensive modification.
so was this a use vehicle with a brand new motor, rebuilt or? You said there was only 140 miles on it which makes me want to ask why in the world did the customer not go back to whomever did the work to begin with for warranty instead of that shady person? There's also a chance i completely missed something early in the video which explained this and i'm just stupid
The 2014 and up LS AFM lifters fail a little different than the older ones from my experience. First, I have had them still move the rocker arm at cranking speed and give false compression readings as good. Second, about 8/10 times the cam gets damaged and needs to be replaced with the lifters. When pulling the engine the intake has to come off so I factor that into the estimate. I typically charge a flat rate to pull the cylinder head for further inspection. If it needs a camshaft, which is engine out, I credit the customer for the time of the intake removal.
Just did a 2011 6.2 l94. The dod valley cover had loose bolts, probably due to gaskets shrinking due to heat cycles. The rh bank oil pressure ports were leaking oil between the tower and the gaskets. The spraying oil also washed the parts beside it clean. If you would catch the problem on the first day, then a ict billet valley plate and a tune would save your lifters and cam. In this scenario.
@@bigmurph1447 i do at least 2k a month highway driving with my sub 5.3L . I changed the oil at 50%. I switched to amsoil and at 30% the oil still looks good amber colour where as other cheap brands would be dark
Another example of troubleshooting engine issues at Dave's Auto Center. One problem that could really cost the customer large sums of money on a GM product.
I'd swap spark plug and coil to another cylinder to confirm part is bad. If problem stayed in the same cylinder you do compression test to find if cylinder good or bad. Had the problem moved on to the swapped cylinder could get away with plug or coil. Some poor Peruvian guy getting run under the bus who's probably trying to make a living and make the American dream come true for him and his family. I'm just saying 🤷
how they gonna sell engines then? they need to keep everyone busy and milk every job. these guys sound good but in capitalism you always need to be making more every year. Dave is a sheep in wolfs clothing
@@Dbars19 no question on his live stream you could see him kick his wife or sons feet to shut them up when they are start talking about things they would deem could lose them business.
just did one of these the other week these ls motors after 2006 have special cylinder cut out lifters on cylinders 1,4,6, and 7. most likely one of number 7 lifters collapsed, there's a way to unstuck the lifter without pulling the heads. after that i delete the afm dod system by sending the ecm off to get reprogramed. so any of the other 7 lifters dont get stuck down in the future. but i understand you guys make your money building and selling quality motors, wouldn't be very smart for you guys to do that
Can I just say that almost every manufacturer is building shit engines with the EPA and Federal assholes wanting cleaner and more efficient cars too quickly. Hell even Honda and Toyota are having engine hiccups.
We just lost a 2021 6.2 motor on a GMC Yukon Denali at 31,500 miles. They told me it was a Cam Shaft issue and replaced the motor under warranty. The engine made a light ticking sound for about 20 minutes before total failure at low speeds. No light on the dash or codes were ever thrown before it fell apart. Love this channel because I learn a ton.
@@DavidBrown-jt7yi So sorry señor David …it’s a shame on those car makers I really don’t know what is happening with them I still remember when you see a commercial of a truck “ Like a rock “ and you feel completely confident that you own a truck that is reliable but right after the 2005 truck models all the reliable ones just went down the drain 😫😫
the same thing happened to my brother's 2006 Corvette, smh. after working in the tow industry for 8 years I'll never buy an American car 🫤
@@uptownsamcv Gosh 😫😫a Corvette…those should be a top notch quality car I don’t like to hear about any vehicle getting broken down even if they are not mine
That no code thing is the stuff of nightmares. I’ve had misfires before that I couldn’t believe didn’t throw a check engine light on the dash. Scan tool produced nothing also.
@@munozinni it was a Z51 with a 6 speed, first year 6.0 with D.O.D. issues that also caused oil pressure drop. the shop that was working on it recommended just dropping in an Escalade engine which are aluminum with an aftermarket cam. he ended up selling it cheap to someone that wanted it for a build.
It all sounds expensive, but it also gives them comfort, knowing that their vehicle is being cared for by professionals. You guys are absolutely amazing.
well you have an aging car that is at the end of it's life for that motor because how poorly made it was.
I'm saying stuck lifter since the problem just started overnight. Cam going flat isn't going to happen overnight. Also, I'm with the group that checks plugs, wires, coils first. Then the compression test. Love this channel ! Dave and crew seem to be the most honest and upfront of any shops that I know of. Good hearted folks!
Yep, a can slowly going away WILL result in subtle problems, like light back firing and missing, starting at only light throttle WAY before it gets real bad, for at least several weeks in advance, and then starts to get worse and worse.
A sudden, severe, overnight issue is not a cam going flat
Dump the oil and inspect it and the oil filter for any metallic bits. If the cam's been worn to the point it won't actuate the lifter there should be metal everywhere. If there's no metal then a collapsed lifter is most likely (thought not 100%) the extent of the issue. The information gathered from inspecting the oil/filter will make choosing one of the three described options a lot easier for the client.
But then he can't "upsell" to a whole new engine. 120k on an LS is really not that high mileage.
@@genehart261 not really upsell when the condition of the engine is unknown, if you pull it out and get it done then theres a warranty on the engine and considering it's done by a machine shop i would prob go with a rebuilt engine, they are legit giving him 3 options lmao
@@genehart261exactly! And this channel is all about building engines lol. Need a lifter.? Awe hell jus rebuild the engine! 😅😅
@@nightryder16 "Biggest and best engine rebuilder west of the Mississippi". Don't believe it? Just ask him.
That is what garage floor mechanics do, they guess while looking at the oil in the pan...like it is reading tea leaves.....
Real mechanics do the proper disassemble to determine the exact issue. Pulling the valve covers is easy and quick and tells you 100% the issue.
Keep guessing GF Mech !!!!!!!!!!! LOL
Dave,
first I want to say I love the channel. Guys like you and I are dying breed. Being a semi retired factory trained gold master Porsche Tech specializing in diagnostics. I have the same standard that you that you have. One must prove the problem to get to the root cause before you start throwing parts at it. They don’t train these guys properly anymore. They want to plug an OBD scanner, get the codes and change the part without proving the root cause. IE: parts changers.
Love that you are mentoring and training your guys the proper way. Keep up the good work.
Well you can use a scanner to do relative compression test but ok boomer
AFM Lifter failed- they go bad all the time on GM trucks. Just pull the valve cover off and crank it over, if the rocker arm isn't moving the AFM lifter failed. Sometimes it needs a cam also.
Pretty much exactly what Dave did. Diagnosed the lifter issue
I don't do much mechanic work, anymore, but collapsed DOD lifter immediately came to my mind. I think a broken rocker was an unlikely situation.
Yep! The fact that GM is still using this PROVEN problematic system is criminal. Most drivers haven't a clue what DoD is cause if they did they wouldn't buy the vehicle in the first place.
you think Dave will recommend a DoD Delete and a mild performance cam that does not need springs? i would suggest the BTR TruckNorris NSR cam.
Did you watch the video?
Hey man, my dad is a master mechanic, and every time I don't have to ask him for help, I just tell him what I did, brings me the pride that I never got as a kid. Thanks for helping me on my journey, this isn't relevant to my current trail, but I'm gonna put it in my hat for later.
Lol if you have to explain that you’re talking to the wrong people
First thing I do is swap coils and plugs. If no change then compression test unless I hear ticking.
Was about to say the same
Was the revving up part before or after the compression test?😂
Same.
This
If the fault doesn’t migrate than yes do a compression test and leak down, otherwise your wasting customers money
The first thing you do to find a single cylinder misfire is NOT a compression test. The first thing you do is swap the coil from the offending cylinder with that from a known good cylinder. If the misfire moves, then the problem is the coil. If it doesn't move, then you pull and inspect the plug and replace if necessary. If the plug is good but it's not firing, then inspect the electrical system for the fault. If the plug is firing as it should, THEN you do a compression test. You got lucky going straight to the compression test THIS time, but this is a rare failure.
Start with the cheapest to fix, simplest to fix, and most likely cause/s first.
What if you have spark plug wire and not coils.
If you're pulling the plug anyways why would you not do a compression test?
Agree with Eddie. The chances of it being compression related is much less likely than a spark plug, coil or fuel injector. Do I want to fight trying to get the compression gauge into cylinder 4 or 8 on any Chevy engine just to find I have a bad coil? No. It’s cheaper for the customer if I use common sense and check the most likely issue first.
Failed to say injector or plug wire🤔
You must work at the shop with the idiots he’s talking about
Don’t overthink compression testing. Keep it simple. Use relative compression. If you have one dead hole only like in this video, then crank the engine over in clear flood mode. Use your ears and listen to how it turns over. Does it have a consistent cadence to it? Do you hear an uneven rhythm? You can get an idea of where you need to go next based on what you hear before you even start putting tools on things.
that's the best way 👍
zero need to rush the engine out
Yeah typically it’s a noise you can tell. Steady steady steady fast steady steady
Thanks, that’s great advice. Not a mechanic but understand a lot about mechanical devices. Never crossed my mind to check gross compression variances by flood cranking and using my ears.
That wouldn't run the bill up enough.
You also could measure the amps running through the startermotor wire. And Connect the ampèremeter to a automotive scope.
"Dont throw parts and stuff, man! Figure out whats wrong!" Preach
And the technicians say ...
Amen.
The government throws money at a problem without finding the cause and a bad mechanic does the same thing with parts. I love your channel keep up the good work. Dave you are the man!!!!!!!!!!!
If the camshaft is still ok, and the rest of the engine is deemed ok, check to see if there are any updated parts for the AFM manifold and valve covers, PCV, or just put a catch-can on it.
I'll never forgive myself for making an old lady pay 300+ on her credit card (cuz she had no other money) because I made the mistake of not realizing the loss of compression her car developed. At the time I was a teenager, worked at few mom n pop shops. Never got any sort of worth while training. Just turned bolts and changed parts (slightly exagerating) but I had gotten away from that and spent some time at an autozone. My manager said hey this old lady just needs some plugs n wires in her corolla if you want the side job. So I'm like ok w/e auto zone don't pay shit sounds easy enough. Noticed the valve cover leaking in around plugs, changed em an seemed to run slightly better. Told her she'd probly need the wires and should soon change valve cover. So I did the wires, again running slightly better. But the entire time I subconsciously thought they're was something wrong with the sound of the engine turning over. By time I was done I did plugs wires and coils and didn't fix it... so not only did I have to deliver the bad news that I didn't fix it, but also that the motor was going to need internal work.. and it was like -20f working outside and could not bring myself to remove and return the parts.. over 15 years ago and still feel terrible... never will that happen again.. diagnose and diagnose more until there's 100%proof of a bad part
Just did a lifter job on 2018 gmc over the summer...81,000 Miles now my son 2016 Tahoe is having the same issue.. GM cylinder deactivating is corporate I believe...
I’ve learned so much from this channel being a technician thank you Dave for all your knowledge
Very welcome
What a great shop you run Dave! No BS , just the truth ,thats what sets you apart from many others! Thanks for the channel !
Save the guy some money. Pull the intake. Remove the valley cover. Take a modified 1/4 drive extension and stick it through the dod oil port and give it a couple wacks with a hammer. Should hear the lifter release. Then block the oil port for DOD under the oil pressure sensor and deactivate DOD with a reflash. Good to go after that. Lots of success!
That is what shoud be done. But That pays too little for they anbishion.
Its like a doctor saying, it May be treated with medicine But lest open u UP to know what is really happening.
I've done this to 3 trucks, it works great! Fixed in 3 hours each, for a hundred dollars in gaskets and oil change.
Good to know.
It'll happen again I'm the near future.
Just replace all of the lifters with conventional ones, and flash out the AFM
I had a constant misfire on two cylinders, I knew the engine had decent compression , I removed the spark plugs and they stunk of gas so I knew it wasn't fuel injectors, I swapped coil packs and problem was still there so I eliminated coil packs I then tested wires and I saw I wasn't getting enough power to the coil pack signal wire, I got a wiring diagram and tested the wires at the pcm harness and was still no signal, now I'm faced with getting a new pcm😬 thanks Dave for your wisdom you share🙏
After doing this for so long it’s pretty easy to tell if it’s a compression issue..perform a relative compression test if you see a low hole go in cylinder with the transducer and you can see where the compression is going
Option 4…. AFM delete. Better than a new motor with intact but flawed afm. Deal with the cause as Dave says. AFM is most likely the cause of the failure.
Yup….dod delete for sure, and as a bonus get a healthy cam to wake that thing up
Gen 3 FTW!!!
I been thru that telling people bad news it's hard to tell someone to bend over because it's going to hurt to fix it right keep up the good work making videos and have a blessed day today 🙏
Last week, I fixed a 2017 ish ford escape with spark plugs. The dealer quoted a short block, saying coolant was in the cylinder. Imagine my surprise when I couldn't get the cooling system to pressurize, and I couldn't find coolant in any of the holes. I swapped coils, misfire stayed, the misfire moved with the spark plug, though. And while waiting for coolant to drip, I saw some dripping from the fuel injector. The customer was happy to pay for new spark plugs and a couple of fuel injectors vs. a short block. Oh yeah, this vehicle had 46k miles on it.
If it's a 1:5, should probably just do the short block for maintenance if it hasn't been done yet. It will fail. At that miles could still be covered under extended coverage recall
If it’s a 1.5L Ecoboost, it likely does need a short block. There a service bulletin for it. I’ve probably done a few dozen when I was at a Ford dealer.
Yeaaahhhh if it’s a 1.5 its gonna need a short block if it hasn’t already. I’ve replaced several with less miles then that lol
Indeed. 13,000 miles was my lowest mileage 1.5L short block replacement.
@@ghostwrench2292 I believe I had one with only 8k miles😬. I could be a little off but definitely a couple under 20k
As a VW master tech, 90+% of the misfires we see in small displacement turbocharged European engines are spark plugs or coils. They take less than 5 minutes to confirm. Almost always takes more time to call the customer for authorization than to just test them for free
Exactly. I've seen people do relative compression tests first. Honestly, though, only seen those done on very expensive cars with hard to swap coils/plugs.
Depends on the application, depends on what you have.
Someone who knows what they are doing can do a compression test with a scope in less than five minutes.
But if you can do an rpm drop test easily, sometimes it might take you 10s to find the misfire.
Mechanics today make there paycheck by tossing parts at it. Look how many times they come back to make more money by selling you more parts. Dishonesty is running hard today.
Appreciate you honesty in bring back some faith in repairing.
Really today alot mechanics just aren't trained properly and just change parts based in what the computer tells the. They don't know how to do real diagnostics.
if you paid money and it didn't fix it, you should be getting your money back.
Wow great video, I find the hardest part about being a mechanic is trying to explain to customers all the possible solutions for one problem. You guys nailed it, like always. Keep up the great work.
I have a 2009 GMC 2500HD it has a 6.0 Liter Gas engine . I had a lifter stick in the block at 38,000 miles . Of course it was out of warranty so I had to have our local GMC dealership do the work because I am disabled . They put a new long block in it and charged me $ 6,995.99 . They put everything else back on the long block from my original engine , including the WATER pump ! Within less than 500 miles , you guest it right , the water pump went bad . They tried to charge me another $ 795.00 for that , but after threatening to call the BBB they put a new one on it for free ! I LOVE your videos Dave ! ❤
Never let a stealership... I mean dealership touch your car unless it's warranty work 😮
You have to pull the plugs anyway to replace them. Just do the compression test.
I like how you try to educate the customer to make an informed decision just like you educate the viewers of your videos.
If this is happening to an AFM engine, to where the lifters are failing, should an owner look at removing that entire system?
And yes, I learn so much from watching these videos. Dave, his Sons and the entire crew are phenomenal people 👍🏼🙏🙏
I love the detailed
answer and options ge provides.
We had a 2007 Avalanche for the wife, first year model AFM. As I recall, cylinder number 3 misfire @ 120k ish miles. None of the usual suspects like cam degradation or VLOM failure.
Turned out it was a single valve tuliping essentially creating an improper valve seal. Our mechanic was actually able to physically demonstrate the failure with fluid over the inverted head. The leaky valve showed itself immediately, yes rudimentary, but when old school is cool!
Yup --- just left a dealership and we dealt with quite a few of these. The mistake a lot of techs are making is not inspecting the engine fully. They recommend only lifters, push rods, and maybe a rocker arm. Meanwhile the cam is wiped out or worse the bottom end has suffered from an oil filter clogged with metal or one that has hit the bypass and ruined the motor completely.
After a while we started letting customers know worst case scenario up front: we may need to replace the motor, warranty or not.
Extra note: right before I quit we replaced a 6.2L that had lifter problems. Customer drove on the blinking CEL. I'm talking severe. I pulled this in and the whole shop was looking at me it was that loud. Bottom end was lost: Gold in oil filter. We replaced the motor with one from GM. Brand new. The thing is banging and clacking after a 20 mile test drive. I pull the oil filter and it looks like someone's kid dumped about 5 lbs of gold glitter into the engine oil. Filter internally looks like something from Alice and wonderland with the gorgeous gold color streaks and I took my TIME pre-lubing this engine.
GM (GMC) had sent us a SECOND bad engine (Sierra 1500): this vehicle had maybe 15k miles max. The customer was out of their rig for over 3 months. Do NOT buy a new vehicle and take care of your old one. We had to replace the replacement motor.
I had a 2018 suburban. Same. Engine I put about 256k miles on it I had disabled the AFM since new never had a issue always change your oil early 3k or so miles SUV still running like a panther
Hey I just Wana say I love your work it really reminds me of my dad he was just a crazy self trained mechanical genius and he showed me things about motors that I have only seen again on your channel so thank you just a thought he loved the 60s broncos and he put a 429 gt 500 motor in a 66 bronze you should do one of those it was the most insane vehicle I ever rode in
I had 1978 Camaro that I had to change the camshaft. That year had issues with soft cams. One of the lobes wore down enough to barely open the valve. It didn't even mess with the performance oddly enough. The engine sounded normal...no noises like ticking or clattering.
Good old GM AFM or DoD. 1, 7 and 4, 6 are all the cylinders that get deactivated. Lost a lifter on a 5.3 did a DoD delete and now runs like a champ.
Yup their a real problem child
@@SHSPVRnot just theirs. All cars that have cylinder deactivation will experience failure due to that system. Just a matter of time.
with DOD its all 8 cylinders.
@@christopherdowning7776 No it on 1, 4, 6, 7 is DOD. But AFM can do all 8 cylinders by turning off the fuel Injectors which improved the fuel mileage
Question what is a DOD I run a module to keep all cylinders working
That's why I've been hooked on Scanner Danner videos. Guy shows me every day what I means to truly diagnose an issue thoroughly and not just throw parts at something hoping it works.
You get lucky 7/10 times and most shops are fine with that.
But they learn and find nothing by just throwing parts at it.
And that other 3/10 times? Well, this happens. Or cars get sold to auction and then guys like Scanner Danner come along and literallt bring the car back to life afterike 30mins. Something 10+ shops couldnt figure out.
Diagnostics os the future, especially with cars becoming so unreliable and expensive. I trult think that, along with electronics is the way that will weed out the parts changers.
Honestly, watched a ScannerDanner video in which a truck with an intermittent misfire got towed to him after visiting multiple other shops.
All the guy did to find the fault was a clear-flood crank test. He heard the engine tick every other cycle.
Identified what 5 or so shops couldnt in less than 10s.
Know your fundamentals!
You can literally do a relative compression in 5 minutes with a Pico Scope and find a bad cylinder.
too cheap!!!... Option 2 is pull the engine to remove camshaft then CT has no other choice but fixing it
True, however I don’t think it’ll tell you which cylinder is bad. Which is fine if you have a misfire code for a specific cylinder.
@@enderlane the computer will get confused sometimes with the misfire. It watches the crank speed and tries to guess which cylinder is causing the misfire.
Then a incilinder pressure test.
Absurd if engine screwed at 130k....best chuck in scrap and put a Corolla engine in it😂😂
I used to load up the parts cannon all the time. After many dollars and lots of headaches. I’ve learned to test things first like compression for a misfire
Miles seems like a great SA. You guys do good work.
I think part of why people often overlook compression is in part due to the phrase "an engine needs 3 things to run, air, fuel, and spark" my mentor at work had to correct my thinking about this recently because I said that exact phrase to him when diagnosing a miss and he corrected me by saying that compression is the 4th thing.
When choosing a mechanic, you must choose wisely
Copy that .... To the power of 10.
Yeah, customer chose the you need a new $10k engine shop.
Every one wants cheap. As my sister in law says, "you pay peanuts, you get monkeys"
Can't choose wisely without knowledge and experience
Jordan Peterson said something like "most expensive is the cheap lawyer " not exact quote, but you see where this goes)
I dont really post comments on youtube must i must say & appreciate how this is one of the best put together videos iv seen on youtube love it just love it
It’s def the AFM /DOD! Just need new lifter and back on the road!
As a mechanic I swap in 5 minutes 5 and 7 if misfire moves easy if it doesn’t. On a GM #7 lifter heads coming off 30 minute diag
I wish y'all had a shop in Ohio I'd love to take my truck there just to get it looked over and maintenanced
I sure wish all the mechanics were as good as you guys. I'm 100% going to bring my problem to you when one occurs and I'm in Kansas
It's a GM put it in Clear Flood Mode and do a relative compression first.
not enough labor
I remember the day doing all these tune-ups with points and condensers having a lot of fun replacing plug wires and cleaning caps and rotors. It was amazing but a lot of the champion spark plugs that pulled out the the outer electrode was missing. Poor quality control by champion. And they used to be the number one company.
Thank you Dave for your excellent videos!
I was at the Chevy dealer on Thursday afternoon and in their shop they had several trucks with the engines out of the vehicle. All had problems one way or the other. Doesn't say much for the brand. In 1993 I bought a brand new Chevy truck that had a miss, I had shown it to a mechanic at work and while it was running he said sounds like a bad camshaft to him. The dealer would not fix it, so I traded it off. We had moved from Florida to Missouri and we took our vehicles to a dealership for oil changes. I went to pick up my wife's car and they told me to bring it back the next day because they were telling me that the engine was leaking oil. So I looked at it at home and all I seen is where the mechanic had spilled oil. I thought to myself that they wanted to charge for another appointment for nothing. That service manager is no longer there, imagine that!
All the haters here either aren't mechanics or they aren't very good ones. A relative compression test should be backed up with a manual one. Either way, you will end up with the valve cover off and the plug out to see WHY you have low compression. Relative or manual makes no difference in the outcome, and there is no time difference when you actually have an issue (because you end up doing both).
The options they offer are fine, too. The cheap option is sensible, but it will cost more in the event that the cam is toast. Some people want the engine gone through, some want warranties, and some have money to spend.
Looking at the oil filter tells you if you're screwed or probably okay. Probably okay isn't very assuring, and it's guessing. Getting eyes on the camshaft is required for high-quality work. No guessing.
Yes, he's in business to make a profit. Yes, he's an engine builder, but note that he also offers the customer budget friendly options. A shady shop doesn't give you options.
Keep doing what you're doing, Dave. You set an example for other shops to follow. Most service managers should watch this channel and learn a thing or two.
You can’t give options. You will end up in court. You are an expert. You determine what needs to be done to fix the vehicle and have the repair last longer than the rest of the engine. That is your job and why you are in business. If they want to band-aid it or gamble then let them do that elsewhere. No amount of documentation and explanation will stop you from having some psycho screaming at you and calling you a crook in front of other customers.
No relative compression test needed on that. You can hear it’s down while cranking. These valve covers are easier to pull than doing a compression check.
Thanks maestro
When I was in Auto shop back in the early 70's , The teacher spent the whole class time that day teaching how to read a vacuum gage .That would tell a lot before jumping into needless diagnosis .Today there is so much diagnostic tools out there to find and fix (miss fires) to spin your head around . Miss Fires are caused by a lot of issues ,and it takes a trained skilled mechanic with logic ,scanners and basic tests to find the cause ,with out throwing parts against the wall ,of the past. Scanners don't fix miss fires trained technicians do ,sad there is not a lot out there is some garages (dealerships). Yes compression test tells alot to some techs .
I’m my experience, worn spark plugs are the reason for misfires about 90% of the time.
I like Dave's advice on checking misfires, but with a slight tweak. Before doing a compression test, always swap a coil. It's way less labor for the customer, and if it turns out to be a bad coil, this will always confirm it. The customer will appreciate the reduced cost, and plus if the misfire doesn't move, it's even more indication to do a compression test, and doesn't involve any new parts.
I worked at Ford when 6.7 first introduced. Had a misfire on cyl 3. Base engine miss. Found all valves on that cylinder had hairline cracks. Contacted Warranty department and asked for time and labor approval to pull both heads and replace all valves, seals, keepers etc....Ford warranty only approved cyl 3 and thats it lol BS
That’s crazy I can’t tell you how many times I’ve been there.. I like to do everything right if I’m gonna be in there that deep I wanna make sure I get the job done ford don’t think like that obviously
Thanks Dave I'm learning alot watching your videos. I like to work on my old trucks keeping them right
Cliff Morris
First problem? Late model GM. I'm not bashing GM, but it seems there have been a lot of QC issues over the last 15 years on many GM components and assembly. Just my take.
As for this one, as you approach $4k of repairs on a 120k-mile motor, you might as well pull the motor. You can get a GM 6.2 (if that's what in there) remanufactured for about $5.5k. Full warrentee. Just hope you don't start having drivetrain issues. Those transmissions are also on the QC watch list. Another $5.5k. Sigh. Unfortunatly, motor vehicles are a bit disposable. They don't last forever.
Not all vehicles are disposable. Our 19.5 year old Lexus hybrid has never had any reliability issues, and it's more complicated and fuel efficient than most Ford, Chevy, or Dodge vehicles.
@@davepaturno4290 Good to hear of a success story.
@@TSGEnt Thanks, but really, there are many such success stories by the vast majority of Totota/Lexus hybrids.
A spark plug story from Europe:
I bought a new car almost 2 years ago. After about 1.5 yers, I decided to install lpg because 😊. Soon after I tried the lpg, I have seen that it didn't work as on gasoline. After many visits on two lpg services I found out that one of rubber pipe, which is installed between one spark plug and one ignition coil, it had the metal spring too compressed. The sollution was just to stretch it enough to create a little presure on both side: spark plug and ignition coil. That was a happy end after about 3 monts of strugle with lpg.
Question of the day do you use thicker oil the older engine gets I've always used Shell Rotella 1540❤😊
I do ...
slightly thicker oil in an older engine tends to take up natural wear. It may reduce oil consumption, increase compression slightly and reduce noise.
After being a mechanic for 30+ years, It took the first ten years of my career for that lesson to get burned into head as being routine. A spark plug will not fail prematurely if the compression is within 10% of Specs, and fuel mixture and delivery system are functioning properly, and learning to read those old spark plugs will often work as breadcrumbs pointing you in the right direction
Cam and Lifters went out in my ram at 160k. Instead of just doing the and cam and Lifters I had that motor rebuilt with mds delete and hellcat oil pump. My engine runs like new
How was the sludge in the motor? The VVT system on those engines will beat the crap out of the lifters if you let it. Did you go with better cam or stock? Good choice on the hellcat oil pump.
GREAT VIDEO AS USUAL AS A 65 YEAR OLD MASTER TECH I WAS ALWAYS TAUGHT TO DO A VISUAL INSPECTION BEFORE ANYTHING THEN CHECK FLUID LEVELS THEN CONTINUE DIAG
This is a VERY common problem with the 5.3's from around 2005 on up included the LT series engines. The AFM system eats cams and lifters like candy corn. I used to work at a GM dealership and basically had one tech that was doing cams/lifters and pistons/rings on 5.3s. It was insane.
In first video why not include opening oil filter to check for glitter to provide some indication that the cam is possibly trashed.
I've always been interested in cars, I've worked on my cars for 50 years. I also have an Associate Dregee in Automotive Technology. Nobody works on my car but me.
Check for metal (“forbidden glitter”) in the oil?
That might give some more information on the state of the inside of the engine?
There’s malice in the combustion palace.
@@Parker53151Thank goodness it's not Uncle Rodney.
exactly nice filter juste remove this head and hope filter bad need new engine
Check the block inspection port first!
Yes. if there is no metal in the oil or filter could mean the lifter is an issue.. As to round the cam lobe and wear on lifter would be lots.
These guys are an inspiration. I wish work/learn with them.
I’ve had several different misfire codes on my vehicles over the years, never because of a dead cylinder. I would always check plugs and coils first and most of the time that was the cause. Plug wires get old and can arc right through the insulation, I’ve had that be the cause of misfire codes twice.
Though I’m by no means an expert, my first thought was, like so many others, something to do with the AFM (or whatever they’re calling it now) system and a bad lifter. I like that a compression test and running it without the valve cover were recommended as alternatives to “throwing parts” at it; I probably wouldn’t have thought of those. I also agree with draining the oil and looking for “forbidden glitter” would be a good step, as well.
I am 62 years old and my sweetest and mot cherished memories are those times spent with my aunt and uncle on their farm. They inspired me, but starting was a problem but with an income of $57k monthly I was able to. My first year farming generated us $142k here in Tynan, TX. We never looked back, agriculture (ranch farming) is a gold mine
Great post friend
How do you get so much in that period of time???
I started a business of sort too. But have no social media so marketing is word of mouth. How do you handle the marketing aspect of it?
Talking about marketing and delivery, I wish I have what you guys already have as regards marketing my produce
Is paid advertisement necessary to succeed on POD?
Pull the push rod out and use a bore scope to see if the lifter is collapsed, simple first step. You can then rotate the engine to verify if the lifter is collapsed or seized and not moving. I'm sure it's a collapsed lifter as a tore up cam would be very noisy beyond just a misfire due to no intake air and the oil filter would be full of metal shavings.
Hola 👋 señor Dave!!! If I was the truck owner I definitely go with option number three because you guys can make it happen and I know I’m in better hands than Allstate 👀😳I will see you guys in the part deux😊…Saludos!!! Keep up the great content!!!😊
I’m agreed. A 🥚
Rebuild the engine
@@Amarillobymorning777 Yes sir !!! With señor Dave you know what you get…he has pride and honesty in his work and business, hard to find these days …if you go to a shop where they do state inspections kind of fishy 👀😳😫and they have a bunch of vehicles parked in or around the shop you better be careful of them because they will change your battery for another old one and they will dig inside the vehicle like drug enforcement if you know what I mean always find a good mechanic and keep it 👋👋
@@munozinni
The SUV arrived
Now is on a bay open hood
Woman owner said : just replace what is need it .
Husband said :
Nel
Open heart surgery.
It’s better and they
Warranty parts and labor .
Let’s see part 2
I didnt know dave had a youtube channel I usually just watch his fb reels, im glad he's got long form content, good stuff boys:)
Dave acted like he never seen AFM or DOD failure? WTF About as common as Ford's rocket spark plugs flying out
laughing as i remember friends ecoline van - work van, the irony is, hes a mobile mechanic. he was driving in a stop and go traffic in Ft Worth TX, he heard a bang in the front, he pulled over, and saw sparkplug just hanging there chilling with cable attached. It was extremely hot too. so he waited until it cooled down and fixed it on the spot using the tools in the back. Lucky in my opinion. for normal people. Yeah, I don't know theyd call AAA and rack up all the bills.
Dont bùy ford cheap but invest another half the vehicle priçe. Belt running oil pump??? Wt . One time use oil pan omg. Let the dealers sit with any of the new junk. Buy used resonable .
@@mikeandcolleenk9831 My 2004 Tahoe 5.3 will be with me until im no longer here
Always on #4 or #8 LMAO!!
Hard to make a 12:09 minute video when you know what's wrong before he starts the vehicle............TH-cam money!
Had my ram do this 137 000 miles engine was replaced under warranty and both new engines did the same thing now getting a brand new engine from Ram
motor out lol , dave loves just changing motors lol
Need an air filter? Awe hell jus rebuild the engine! 😅
😂@@nightryder16
I had a similar problem with a 2013 silverado. i pulled the valve cover off and the push rod was not moving the rocker arm on cylinder 6 turns out it was a stuck dod lifter. Weird part was there was no lifter tick, no noise at all. But i swapped out the oil pump and with a home made tool i had made i took off the valley cover and stuck the tool in the hole for the lifters where oil passes through and hammered till the lifter got unstuck. Not the right way to do it but it was a quick fix and the cam had not a single scratch 👍🏽
This happens because there’s a lot of inexperienced techs out there, learning from old guys who are just to just throwing parts at stuff.
Exactly... compression test will determine if it is inside the block... or something external.
I get when you say you don't give prices for work done because of how long the video will be on TH-cam. However, a simple disclaimer would reveal the price and fully inform us of what the price would be and put the bow on the present. Something like,"This price is good for 30 days, expect increases out of our control". Just a suggestion Davey.
that is exactly what happened at my Mazda dealership, they wanted to change the sparkplugs saying that was the cause, but luckily I had just changed the plugs as routine maintenance (were due at that mileage) so told them no, its something else. ultimately a compression test reevealed an issue that ended up being a burned exhaust valve. 2018 Mazda 6 GT turbo engine. Head ended up being replaced just out of warranty
Ok I have only had 1 job my entire life since 1985 an automotive technician I check every misfire the same and it doesn’t start with a compression test it starts with your scan tool and noid light, cop spark test tool. You go pulling out plugs when the first two are fine unless you’re padding a bill. You guys are always bad mouthing every shop except yours
@PeterAngles-jq7gr Dave wants criticism under educated people like you help move the needle
@PeterAngles-jq7gr Really OP right, especially because these are the quick easy things that can narrow down a common issue before you start checking compression. Even a damned coil swap is a more practical early step before compression.
Though in fairness to Dave, his underlying point was properly diagnosing vs parts throwing, in which case we all agree.
One easy way to do a shade tree comparison compression test, is to disable the fuel and ignition and turn it over while recording the audio with a smart phone. You can graph the audio on your phone and "see" the load on each compression stroke. It's the poor man's equivalent to a graphing multimeter with that graphs the load on the starter draw.
Most modern mechanics like everyone else have no critical thinking skills and poor education/training.
You folks are the best.
GLORIFIED PARTS CHANGERS . NOT REAL MACANIC.
@@goldgeologist5320 if it doesn't read out on the computer they can't fix it that's the trouble with today's Mechanic's.
Oh my. New generation.
This is all great, I have a 2002 4.6 intermittent miss until it gets hot. Coils and plugs improved it, looking at EGR and TPS. No codes. Compression was fine, so not sure what cylinder, lifter or valve.
@PeterAngles-jq7gr I can't think of an engine built in the last 70 years that isn't overhead valve. You mean overhead cam and yes they have lifters.
@PeterAngles-jq7gr I am suspect of intake gasket.
My wallet hurts for these clients. But you guys are honest and thorough.
This is exactly the reason why I got rid of our '10 escalade and bought a 4runner. The 6.2 has potential, but that dreaded AFM has to be completely deleted. Thats an expensive modification.
so was this a use vehicle with a brand new motor, rebuilt or? You said there was only 140 miles on it which makes me want to ask why in the world did the customer not go back to whomever did the work to begin with for warranty instead of that shady person? There's also a chance i completely missed something early in the video which explained this and i'm just stupid
When they say 140 they mean 140,000
You missed the part where Dave says it's got 140k miles and then looks at his monitor and corrects himself and says it's got 120k miles.
He meant 140 thousand, and later corrected to 120 thousand while calling the customer.
The 2014 and up LS AFM lifters fail a little different than the older ones from my experience. First, I have had them still move the rocker arm at cranking speed and give false compression readings as good. Second, about 8/10 times the cam gets damaged and needs to be replaced with the lifters. When pulling the engine the intake has to come off so I factor that into the estimate. I typically charge a flat rate to pull the cylinder head for further inspection. If it needs a camshaft, which is engine out, I credit the customer for the time of the intake removal.
Thanks for the no-ending video! What happened?
It was just posted today for Chrissakes!
Just did a 2011 6.2 l94. The dod valley cover had loose bolts, probably due to gaskets shrinking due to heat cycles. The rh bank oil pressure ports were leaking oil between the tower and the gaskets. The spraying oil also washed the parts beside it clean. If you would catch the problem on the first day, then a ict billet valley plate and a tune would save your lifters and cam. In this scenario.
Would only be 3-4 hrs labor and 300 on parts
It's a 5.3 chevy they eat lifters and cams. Because people don't change there oil
380,000k miles I change oil 3k always
@@Nudnik1must be expensive
The Denali’s have the 6.2l, not much better though 😂
@@bigmurph1447 i do at least 2k a month highway driving with my sub 5.3L . I changed the oil at 50%. I switched to amsoil and at 30% the oil still looks good amber colour where as other cheap brands would be dark
Another example of troubleshooting engine issues at Dave's Auto Center. One problem that could really cost the customer large sums of money on a GM product.
I'd swap spark plug and coil to another cylinder to confirm part is bad. If problem stayed in the same cylinder you do compression test to find if cylinder good or bad. Had the problem moved on to the swapped cylinder could get away with plug or coil. Some poor Peruvian guy getting run under the bus who's probably trying to make a living and make the American dream come true for him and his family. I'm just saying 🤷
Yeah probably illegal as hell and ripping tax payers off damn you liberals are truly idiots
I had the same issue on a '21 Chevy truck last year. Replaced AFM lifters, all good. Only had 72k on it
Honestly bro you should check for spark first lol... Thats the easiest thing to do...
how they gonna sell engines then? they need to keep everyone busy and milk every job. these guys sound good but in capitalism you always need to be making more every year. Dave is a sheep in wolfs clothing
@@dejan4666 100% hes a brutal business man. no one gets a shop and 100 employees and not be ruthless.
@@Dbars19 no question on his live stream you could see him kick his wife or sons feet to shut them up when they are start talking about things they would deem could lose them business.
😂😂😂
I have to agree you can check for spark without replacing anything
just did one of these the other week these ls motors after 2006 have special cylinder cut out lifters on cylinders 1,4,6, and 7. most likely one of number 7 lifters collapsed, there's a way to unstuck the lifter without pulling the heads. after that i delete the afm dod system by sending the ecm off to get reprogramed. so any of the other 7 lifters dont get stuck down in the future. but i understand you guys make your money building and selling quality motors, wouldn't be very smart for you guys to do that
Can I just say that almost every manufacturer is building shit engines with the EPA and Federal assholes wanting cleaner and more efficient cars too quickly. Hell even Honda and Toyota are having engine hiccups.
@@JulioSanchez-l7o there's the problem GOVERNMENT
Remember that the current political party wants you to buy an EV.