For Tahoes, Yukons and pickups from 2015 and above, with gear No. 6L80, in order to cancel the AFM system (active fuel management), select the gear shift in manual mode and select gear No. 5 to make the vehicle operate on an 8-cylinder system in all conditions to avoid the Engine Valve Lifter problems.
I love this guy i did the lifter trick he invented and saved big money and since i have done it i have 12,000 miles on it and running strong this guy is awesome true jesus on tech 👍👍👍👍👍👍👍👍👍
Just saw this in my subs feed. Been meaning to follow up with you. Your lifter fix and the LT1swap AFM/DOD delete is going strong over a thousand miles in. Saved me thousands. You’re a rockstar!
@@crz400 I spent a few hundred including the tool. About 50-75 on the LT1Swap DOD delete with shipping. Lots of gaskets like intake manifold and valve cover, although I could have likely reused, but truck is 2008 and never touched those before. I took the time to do some optional items like updated baffle valve covers and oil catch can setup. Honestly it could have been done for 100 or so, but I used the time to do those other items noted.
2021 GMC Sierra 2500 6.6L gas. Ordered brand new to take family on camping trip in June. Received truck 2 weeks ago. 210 miles currently. Started misfiring at 16 miles. Dropping off at dealership tomorrow for inspection.
I am working on my truck right now and I have found the pushrod on the exhaust valve on #4 cylinder is bent causing the misfiring condition. I have purchased a complete kit to change the camshaft, lifters, valve springs, and upgrading the rockers to bronze bushings. I have also ordered the HPtuners ALDL interface and downloaded the software to reprogram the ECM. As of now I have spent right at $3,000 just in parts.
Dude you are brilliant! My wife's escelade just started tapping. I hooked up my laptop and no codes. When I turned off cylinder 4 the tap went away. I toyed with the idea of replacing cam, lifters, delete, etc. But I just pulled it all apart today to replace lifters and low and behold I have a bent pushrod on #4. I wish I found this video before pulling the heads because I assumed it was a lifter issue that cause the pushrod to bend. If this happens again which I'm sure it will I'll know better. Thank you for all your knowledge. People like you are invaluable and I thank you for what you do!
@@CrazedPerformanceRepair2017 6.2 here as well. #4 bent push rod. 65k miles and no warranty. 2200$ repair from a GM master tech. Doing bad thermostat and leaking oil cooler lines as well. New VLOM kit lifters and push rods on one head. His tuner wants 600$ for a custom tune. Would I be able to just plug in a range technology plug to prevent it from happening again? I think I’m trading the truck in soon for a 6.6 gas AT4 2500.
My 2021 1500 Sierra Elevation with only 4.6k miles just developed this exact problem last night. Dropped it off at the shop today and won’t have back until next week.
Great video. I was thinking of buying a '21 Trail boss, but after reading all of the reviews and watching videos about the engine issues, no way would I buy one. Thanks.
I bought a 21 sierra knowing this and 13k in cha bang bang in for this problem trading it I. As soon as I get it back 72k to be dealing with this nope imagine out of warranty
Interesting thoughts, but Pushroads, AFM lifters, non afm lifters and guides absolutely the same, same part number as in previous generation engine. And this is not only one problem with this system on L83 and L86. Afm lifters can be destroyed in a bore and major and the most dangerous issue is that they start to rotate in the guides and damage camshaft. I had bend push roads with computer disabled AFM on my Escalade 2016. The solve of this problem is: change all lifters and guides on non afm and block the afm channels by plugs. YOU ABSOLUTELY DON’T NEED TO CHANGE CAMSHAFT!!! We’ve made one Escalade and Tahoe 2016 and no misfires work absolutely great! And one more Escalade 2016 is coming. Camshaft caps are absolutely the same. And the difference is only in 2mm in length of afm lifters with pushrods over standard lifters. But the lifter can adsorb around 14mm by itself. That why we don’t have any misfires! Also the problem can be because of the oil pressure it is too low on 500 rpm Around 150 KPa! The solution is to increase to 650 rpm and oil pressure would be 208 KPa never less!
What I don’t understand is why GM neglected to chamfer the Inside section of the active lifer that slides into the outer section to avoid the very reason it gets stuck when it goes into AFM mode!
Because then the locks wouldn't be able to hold. The thing that causes them to fail is lack of oil pressure during activation, or oil pressure when it's not supposed to be getting oil pressure at AFM side of the lifter. This causes the lifter locks to bind because the timing events and thus knurls the steel locking it up.
I have a 2021 Silverado Custom Trail Boss with a 5.3L (L82) with Active Fuel Management and 6 Speed Automatic Transmission. Super Reliable truck. The ones with the problems are the 8 Speed Models with Dynamic Fuel Management and L84 Engine.
Yikes I just bought a 2023 with Dynamic 5.3 I change oil below 7500 that's recommended and I use mobile 1 I use mine mostly highway ..... I did by the extended warranty
2018 sierra SLT...58k miles on it...engine light came on, threw code P0324 for knock senor code accompanied with a engine tick....my mechanic pulled the valve cover and found the bent pushrod almost identical to the bent one from this video. Thankfully caught it before any further damage....im probably done with GM until this is fixed/addressed...Thanks for the video.
@@rayans9348 ~7500 miles, runs fine. Always give her a 5min warm up, remote start while i put shoes on kinda thing. Ave 17mpg, if it’s not in sport mode. Added side steps, ~250 lbs more and no engine issues at all.
Very good explanation. I have the same problem now on my 2023 Yukon with only 1500 miles and no clue from the dealer what they are going to do about it. I think they intend to patch it up with one valve only when they get the parts.
Just bought a demo 2021 1500 Chevy Silverado (5.3 ecotech3 V8, w/DFM) with 4K miles on it. I drove it for about a week and service park brake, ESC, and engine light came on along with some serious knocking. Drove straight to dealer. Finally got it back today (2 weeks later). Had a bent push rod on cyl#1. They replaced lifter, rod, and guides. Dealer says it’s fixed and that there was just a problem with a particular batch of lifters… idk if I completely buy that but we’ll see… wondering how long I have until the others go
@@KCIDoGIB oh gosh may be time to put on pushrods I offer and if you need to take it in for any other engine warranty swap them out with the factory ones. At least then you'll have less hassle than bringing it in every 4000 miles.
i bet it goes back to 2007 when GM introduced AFM. I have a 2011 5.3l have lifter issues several times. I have done regular maintenance and oil changes. My first issues with the lifters happened at 50k then at 75 and now again at 100k. I don't drive much and I only have 115k on my truck. Am I expected to keep repairing this truck every 25k miles? It sucks. Im seriously considering something other than Chevrolet.
Good luck. In the infinite wisdom of the US government, and on behalf of the corrupt side all vehicles have some form of this fuel saving garbage on them. It's not really saving much fuel anyways, it's just producing less smog during the scenarios which the epa tests are preformed. It's all a bunch of garbage to separate tax payers from thier money quicker, and force you to buy new vehicles which they can tax you for more often. All under the ruse of saving the environment. Just like the new gas cans that cause you to spill and spray gas everywhere except for the tank on your mower.
I've been wanting to upgrade my 2001 Silverado to something a little newer. I was definitely concerned with lifters though. Glad to see someone has a sensible solution!
Get a new Twin Turbo V6 Tundra. I saw an engineering video on their new 3.5TT. My guy, Toyota over-built that thing. They re-engineered the bore and stroke ratio, they made the stroke taller which means more torque and less pressure strain from the boost. Also Toyota angled off the valves, pistons and body housing to overcompensate for the turbo pressure. I'm telling you yes I know they are Japanese, I know they are not a V8 anymore, but these guys did R&D for 14+ years to make basically a Ford ecoboost, bro you know that shit will last forever. I love V8's from sound to N/A power, but even I will admit, after seeing the over thinking and over safety Toyota put's in their motors, I'm done with all these car brands. All I buy is a Toyota now. I don't even care where the hell it is from.
I have a 2021 GMC Sierra AT4 (6.2L). The truck appears to run fine, but I have a question. I know you can "disable" the DOD/AFM by driving (shifting) to "L9". Will this help with all these bent lifters going on?
Just found my #4 intake rod bent and a few scores on it. I’m at 146,000 miles on my 2015 suburban. Other lifters on the passenger side still look ok. It looks like this engine has been worked on before I got it.
I have a 2017 Silverado ltz with 6.2. I bent a 1st pushrod at 115k. No misfire or code, just valvetrain tick. Replaced it and now it’s ticking again 2k miles later. I turned off the AFM after 1st bent pushrod. Going to go look for your pushrods now.
Very interesting concept. And if it’s true I would love to get the pushrods replaced before failure. Or during repair after failure. However with a 2021 truck either of those options would void the warranty. So we are kinda stuck with the faulty design :((
Most people believe a range disabler prevents the lifters from going since there isn't the shutting off or start and stopping of the cylinders. What do you think of this?
I had a bent pushrod on my 2015 6.2 high country 217000 miles but I’ve ran it with a direct port range chip for a afm delete i probably think it helped me delayed this bent or collapse pushrod or lifter problem right now im doing a complete dod -afm delete with the respective tune i hope this solution help me keep my truck a bit more longer, i like the video and subscribe! Good information !
Hi, Just bought 2012 GMC Denali with 6.2, 130K, seems ok thus far, anything you can recommend to keep stable for a few more years? I just bought the Range AFM disabler. Is Mobile 1/K&N oil filter wise? Thank you for any guidance.
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2021 GMC, push rods are good but I have a collapsed lifter. Does your tool work on the DFM or just the AFM?
21 Silverado here, 7k miles. Knock on wood no issues.....yet. Changed oil at 5k to Pennzoil Synthetic and Wix filter. We'll see what happens. I did also install one of those Autostop Eliminators.... Fingers crossed!!
I just saw a random tic toc a video that showed a 2021 with 5000 miles with bent push rods, at the dealer. I'll stick with my 6.2 and 6.5 diesels, and my Corvairs. My Mercedes and BMW? Those are another story
My son bought a 2021 Suburban and because of the Chip issues the truck dont have AFM. Im wondering if they installed standard rollers lifters or the DOD lifters are there just not controlled. What do you think? Thanks Mike
I would think that they would try to save cost and go standard. However, if they built the engine first then found out there is a shortage they definitely would not pull the AFM parts back out.
2015 silverado 5.3 Thanks for this explaination and I agree with what you are saying. Last summer I thought I had a stuck lifter on the passenger side. When I pulled the head apart and examined the lifters none were in the stuck position but I did find a bent pushrod. I replaced the lifters anyway along with having the head cleaned, replaced the guides and pushrods. Now this summer, the driverside has a tick and Im thinking bent push rod. Hopefully it is because its a much easier fix... I'll follow up later this year.
Hello, army veteran here, 8 years wheeled vehicle mechanic, been a gm tech the last ten. AFM lifter failure very common. Personally I think the lifter fails which then causes the push rod to bend. See a lot of these fail due to lubrication issues, poor maintenance or failed vlom, weak or failed oil pump. Under warranty we replaced all lifters on the same bank, push rods as needed..
I've seen people go to the dealership to get the lifters replaced because of a bent pushrod. They later on bend another pushrod and buy my upgrade. I've also seen them bend a pushrod then upgrade to the version I offer and end up with a bad lifter later on, likely because the pushrod is stronger than the failing lifter. That bad lifter did only happen once though. Perhaps it was a coincidence or fluke. Every single one of the bent push rods I have seen though, has some sort of side interference on them. This indicates it is interfering with either the head or the AFM lifter spring. Any interference like that can cause a harmonic deviation and thus bending a push rod. The ones that I now sell are a smaller diameter heavier duty pushrod. This adds more clearance to prevent the contact and stiffens them up to reduce the harmonic.
My 2021 Silverado RST is in the shop right now with this problem. I'm a stay at home mom with stage 4 colon cancer if that let's you know how its driven. Not driven hard at all. My husband got in it to go to Home Depot and got half a mile and it was knocking so bad he brought it home and parked it.
I have a 2020 Silverado and heard that this was only happening to trucks built from Sept 2020- March 2021… I will get repaired through recall… my question is if I’m at 29k miles with no issues at the moment … should I go ahead and this done to prevent anything from happening ?
I got a 2017 silverado with the 6.2 and it had a bent pushrod on #7, in the middle of the DOD delete right now. Its a PITA but i hope to have a nice reliable truck after this!
Well I just bought a 2021 rst with a 6.2l. I heard about this problem but bought one anyways. It’s my favourite looking truck right now. Hopefully it keeps running good. The 6.2 is quite the mill, fun truck to drive.
@CrazedPerformanceRepair do you think an AFM disabler would work for a 2016 Yukon Denali xl? Just got it back from the shop bent push rods at 40,000. I loved this car and was planning on getting another, thanks to your channel I have changed my mind.
Excellent information. I don't currently work on this gen engine but have a feeling I will be. You should put out a video on the products you've commissioned/ suggested for the afm/dfm preventative maintenance/ mods
How does this system work? Does it hold the valve open during a compression stroke to stop building compression or does it leave the valve closed. I would think in the new system using all 16 lifters it would leave the valves closed before the compression stroke. No air in no compression. If there collapsed do they release the collapse between compression strokes? If not how does it handle the cam lobe hitting the lifter while collapsed and the valve closed. There would be nothing keeping tension on the pushrod. It would be bouncing around like crazy. Something missing here. If the collapsed lifter is spring loaded with enough tension to keep the pushrod in the lifter and set in the rocker arm but with not enough spring load to actually open the valve then I can see how this works. But there always has to be tension on the pushrod or it would drop out of the rocker arm and that would be catastrophic…. You may be right about your bend theory. But I think there is still an issue with when the lifter is collapsing and when it is supposed to extend. A small amount of slop during the collapsed mode and the extended mode may be enough of a shock when going from collapsed mode to extended mode when you plant you foot to the floor. RPM would rise rapidly. If the push rod bent it would produce a mark on the pushrod on the opposite side of the bend. Because it would be leaning that way and hit the side of the lifter. Is this system actually capable of changing modes fast enough over and over if you have a heavy foot and invoke full throttle from light throttle. Or if you are in tow/haul mode and the transmission does some aggressive down shifts. I do not think locking and unlocking a lifter with oil pressure will ever work to be able to control a valve. Bad idea from the start.
So this happened to my 2019 Suborban with the 5.3,. Less than 60k miles. Heard the loud tic and the pushrod was a boomerang. Had a newer GM pushrod fail on a gen 1 SBC right after a rebuild as well so a combo of bad geometry and possibly poor contrsuction. If you have one of these order the kit NOW and disable AFM. The dod delete kit is a daunting project either on the wallet or on your back.
We just purchased our first new vehicle in June 2021 - a 2021 Chevy Tahoe RST with the 5.3L engine in it. Do we have any feedback on this engine in this vehicle? Are there any stats as to when the bent rods are materializing and under what driving conditions (maybe similar to mind)? I'm on the road daily for my job and drive at high speeds 60-80MPH. Since we purchased the vehicle, I've driven just over 14k miles. I know, amazing, but this is the kinda miles and speed that I will be putting on this vehicle on a daily basis.
i'm in the market for a 2010 to 2015 yukon denali xl. after watching a bunch of videos on the problems the gmc v8 engines have, i'm thinking maybe i should see what ford has to offer
I did a “patch” job on my 17 Sierra 6.2 to get by until I could do an afm/dod delete. Replaced the no 4 afm lifter and pushrod, and lifter tray. Lasted about 2 months. The lifter wasn’t collapsed, but the pushrod looked identical.
@@CrazedPerformanceRepair never mind I found your website. Placed an order for 4 pushrods. Had an error with payment, tried to resubmit and it said it was still processing the previous payment. I’ll email or call you tomorrow if it doesn’t look like it’s going through.
your correct about bigger issues. ive done close to 20 2019+ new body gm trucks. lowest ive done is 300 miles highest ive seen is 70k. at one point headgaskets and hp fuel pump lines were on national backorder. gm decided with this "chip shortage" starting at march 2021 their wont be anymore HD radios in any trims in any gm vehicle and wont have the bs lifter stuff.
and when doing warranty work can only use "gm" designed stuff. gm did have a massive recall on the lifters themselves and have an "updated" design for the new said lifters. only able to do the one side thats having issues cant do both sides even though we know its going to come back in so many miles for the other side. ive done a couple where i fixed one side and a week later same customer back with same issue except its on the other side. its gotten bad
We have a 2016 Escalade ESV platinum with 95K and it keeps bending the pushrod on cylinder #4 over and over even after a fully AFM delete and a full lifter rebuild and replacement. So expensive and frustrating!! We are going to upgrade all the pushrods to these stronger ones and hope for the best! Screw GM!! 🤦♂️
currently doing a delete kit from BTR with stage 2 cam. I had trouble finding a tuner that worked with OEM computers so I have self taught using HP Tuner
I wish I had known about this 2 years ago before buying my used 2014 Corvette. Engine was blown and had to be rebuilt associated with the bent pushrods, bad lifters, and damaged heads not to mention excessive carbon buildup among all other damaged parts. Repair total came out to be $13k. Thank goodness I bought an extended warranty for the motor
I now offer a pushrod to take care of the bending issues on my website. Smaller diameter and heavier wall tube. Reduces interference issue by making diameter a bit smaller.
i had this tick sound BS, pulled the valve head saw a couple rockers with play, pulled the one with most (only 5mm of movement) saw rod bent (bent it straight) now ticking sound is gone. but imma go ahead & plan lifters, and rods replaced and probably cam too. but saw this vid after my own diagnose. My 2017 escalade only 97K miles.
I have a 2019 Chevy Trailboss custom 5.3 with 6 speed and older tech 25,000 miles no issues Inknow many with the newer 6.2 that are having this issue so your saying the Active fuel management is the reason this is more common and the engines that just shut off to 4 cylinders are less likely to have issue ?
2015 6.2 silverado. just pulled my rods today. 3 were slightly bent. The rod above the failed lifter was extremely bent to the point that it was wedged inside of the head.
Yikes, don't forget to upgrade those pushrods to hopefully prevent the issue in the future. I offer them at www.crazedperformancerepair.com but if you can source them elsewhere go for it.
I have 2015 chev Silverado 90k bent pushrod # 6 intake .I replaced pushrod and added 3k highway miles .engine started to misfired after a week driving around town .I had the same push rod bend again and lifter is destroyed .
There is a TSB coming from the dealership. But there is a lot of national back order and we usually don't get those lifters until around 2 weeks average
They know it's a design problem. GM should have to pay 100% to fix any engine no matter how old. Stuff like that would rarely happen if they had to recall and pay rather than making money off the poor sap they sold one to that didn't know about the likely intentional design flaw.
Dear @CrazedPerformaceRepair, I have 2021 GMC Yukon Denali 6.2L, with one bent pushrod. I changed the rod and the lifter (altough it was good). After the first start of the engine, the problem was the same because I checked the pushrods and the new one was bent. Could you please give me some advice to solve this problem? Thank you in advance. Best wishes, Dániel from Hungary
Hey buddy awesome Channel I'm DieHard Chevy guy been looking for a new Silverado and noticed that they're offering non-active fuel management in Canada right now but I think same eng parts just electronically deactivated
Pretty sure they mechanically removed the system as well. It's much cheaper to put non DFM parts in and since they have them for other models why wouldn't they? I'm willing to bet they are full non DFM.
I've had my 2007 Silverado 5.3L since new, always serviced myself, always used Mobile 1. Thought she was bulletproof up until a couple of weeks ago at around 447,000 miles. The lifter tick started, then a couple weeks later suddenly started running horribly, missing. Code shows misfire on cyl 6. Removed the valve cover to crank by hand and check for a loose rocker, but NO loose rocker at #6. Just immobilized rocker. Bent push rod? Thought I was going to buy the "tool" and free the lifter, but now IDK. Please help.
How do you determine if the rod is bent? It's not visually apparent. I put it on a straight edge as well. Doesn't seem bent. Still throwing the 306 code. New plug, New coil, New injector. Lifter is working and operating the rockers and opening the valve. I did have the injector oring issue you mentioned, I replaced the injector and the oring. I'm at my wits end with this thing! Help!!!???
Did you check rocker movement while it was running or while cranking it over a while using starter relay? You could have a spun lifter that stops working as soon as oil pressure is present.
I have a late 2021 Silverado with the 5.3L with DFM. I called the dealer to ask what I need to do because there is a civil suite against GM. They asked for my VIN # and they looked it up and said that my truck doesn't show that there is a problem. So now I am more concerned, are they basically saying we going to do nothing till it breaks ?
Hey your video are super helpful thank you! I have a question however. I just pulled the head on my 2014 Suburban on the passenger side. My old afm lifters spin inside of themselves. But the replacements do not. Why is that?
They have the pin that doesn't allow it. Not sure why they did that. I do know those are the ones more likely to fail though. Since they don't rotate they beat up on the same part of the shelf all the time rather than the entire area of the shelf inside the lifter.
@@CrazedPerformanceRepair thank you for your response. That's sad to know as I closed it all up yesterday. It did however run better than it did when I bought it. Thanks to you and your vids.
With pushrods, possibly. They not only hit the AFM/DFM lifters but also the heads. BTW that year should have DFM rather than AFM if it's equipped with something.
Bought a 2021 Suburban Z71 in January... 2 days ago, with less than 5k miles, I limped to the nearest Chevy service center. I was told that it's likely a collapsed lifter and they'd need it for at least a week. To add insult to injury they gave me an Equinox as a loaner - extremely tight fit for my family. Furious is an understatement. What if anything should I address upon pick-up? How likely is it to happen again? I want an extension on my warranty 🤬
Gm used the incorrect pushrod diameter from factory. If bent pushrod happened to yours it will happen again unless corrected with non interference parts. I do offer a solution on my sight but unless dealer is ok with it you would likely void the warranty using them.
I installed a new cam and lifters in a 2010 yukon. Its cranks and dies in 5 seconds everytime. I went with a 3 bolt cam and removed the single bolt vvt cam. Dod has been deleted, does vvt also need to be deleted or or do I have a bigger problem?
I have a 2014 with 130k, The engine a 5.3L so far runs like a clock but I just had my transmission replaced! Scotty Gilmore has shown numerous videos on how GM quality has declined each year since 2013. Damn shame especially since the price has not declined the exact opposite matter of fact. A top of the line crew cab Z71 silverado 2500HD is around 75k that is criminal!
Your one of the lucky ones then seems hit or miss on weather or not they interfere from factory. Edit: Just realized you said 2014, those don't seem to have this issue. It's 2017 and newer.
Transmissions need reprogrammed too. In their infinite wisdom they crawled into bed with the EPA and get a higher mileage sticker for the window when they come up with these DOD, AFM and slipping on purpose converter lock up clutch ideas. They don't care what it costs you, it's yours now. They only care about competing with the highest mileage sticker they can get so they propose that if we let the converter clutch slip 10% in high gear how much is that worth? EPA says how about 3 mpg? Deal. And you are buying a worn out converter that shudders because they told it to wear itself out early by controlled constant slipping. Fills your oil with metal parts eventually and there is zero hope that it ever has a good ending for your wallet. You need high level programming tools to make it slip 100% in all gears except for high and there it slips 0%. A lock up converter was supposed to be the ultimate in economy, but GM doesn't care who gets screwed as long as they can sell vehicles. Hiram on the Automatic Transmission yt channel does some of that reprogramming, high end shops should already have the equipment to do it. Crucial that the temp control for the cooler gets bypassed, they just don't work right for very long and when they don't work, they have zero cooling - how long is that gonna last? As if it were designed to fail in "burn it up" mode.
Might not be, turns out some of them are also inferring with the cylinder head as well. If you have over 10k miles on it without issue you should be good at least for a while.
As far as the LT4 engine, does this issue occur only in automatic transmission vehicles, respectively do the manuals (Z06, ZL1) also have cylinder deactivation?
My 2021 6.2 Trail Boss with 13k mikes has lifter problems. Been in the shop for 3 weeks with no eta on parts. Over a dozen vehicles in front of mine have been there for 6 weeks.
I have an 09 silverado hybrid. If I use HP Tuners and turn off the DOD, do I still need to mess with the VLOM or Cam / Lifters at all? I can't seem to find this anywhere.
That's because no one has the ability to turn AFM off in the tune in the hybrid. If you had a lifter fail, you are going to have to replace lifters and address the source of the lifter failure. They fail from lack of oil pressure during activation.
@@CrazedPerformanceRepair what I'm trying to find out, is why the VLOM needs blocked? Say I had a normal truck. Fully working. Why couldn't I just disable DOD in the tune, and drive the truck that way? Like in an attempt to prevent the lifter failure from ever happening?
We had 2 2015 Sierra come in with a misfire and engine noise. Both had cylinder 6 misfires. Both had a bent pushrod. We replaced all 16 pushrods and lifters with GM replacement parts. The AFM lifters are getting VERY difficult to get.
You will probably be back for warranty again soon unfortunately. GM has their heads up their butt as far as fixing things. They think the oil consumption on the older generation is from a oil relief valve in the pan. It's been from the PCV system due to a valve cover issue the whole time. They have a TSB specifically for the oil relief valve. And that's just one example.
had a 17 sierra with 95k kms that came in with a tick and a miss on #4. pushrod was bent on the intake valve and afm lifter was in pieces. did all 16 lifters and guides, and replaced the 1 pushrod with all stock gm stuff. back 1000kms later with a tick again and the brand new push rod in that same hole is bent again. lifter appears to be in tact looking through the hole in the cylinder head. not sure what to do now lol.
It may or may not be an issue. If it happens once it will happen again unless you upgrade the pushrods. Without AFM/DFM lifters it has less chance of the issue but can still happen. Some of these are hitting the pushrods on the hole it goes through in the cylinder head.
I have a 2021 suburban 7k miles on it just developed a bent pushrod Dealer called me today. This is crazy.
Yup best solution is upgrade to ones that won't fail.
Same. No check engine light. 8.6k miles. Getting it back tomorrow then getting rid of it.
Shades of the Vega engine... or 5.7 diesel... GM returns to the 70s
My 2021 escalade with 3k miles had a bent pushrod. Just got it back. I have a zero faith in gm.
2021 GMC Sierra Denali, 5k miles. Bent push rod
For Tahoes, Yukons and pickups from 2015 and above, with gear No. 6L80, in order to cancel the AFM system (active fuel management), select the gear shift in manual mode and select gear No. 5 to make the vehicle operate on an 8-cylinder system in all conditions to avoid the Engine Valve Lifter problems.
Long live my 02 Chevrolet 6.0 with no DOD or AFM junk and still going strong at 220k miles👍🏿👍🏿
I love this guy i did the lifter trick he invented and saved big money and since i have done it i have 12,000 miles on it and running strong this guy is awesome true jesus on tech 👍👍👍👍👍👍👍👍👍
what lifter thing? can you elaborate?
@@MrIlovebmw86 he’s bullshiting
Just saw this in my subs feed. Been meaning to follow up with you. Your lifter fix and the LT1swap AFM/DOD delete is going strong over a thousand miles in. Saved me thousands. You’re a rockstar!
Thanks, I'm glad I could help.
How much did it cost ?
@@crz400 I spent a few hundred including the tool. About 50-75 on the LT1Swap DOD delete with shipping. Lots of gaskets like intake manifold and valve cover, although I could have likely reused, but truck is 2008 and never touched those before. I took the time to do some optional items like updated baffle valve covers and oil catch can setup. Honestly it could have been done for 100 or so, but I used the time to do those other items noted.
When did the engines with this issue come out?
Don't know what happened to GM. Once they were best. People all over the world used to love GM.
2021 GMC Sierra 2500 6.6L gas. Ordered brand new to take family on camping trip in June. Received truck 2 weeks ago. 210 miles currently. Started misfiring at 16 miles. Dropping off at dealership tomorrow for inspection.
🎶Get that great GM feeling 🎶
I am working on my truck right now and I have found the pushrod on the exhaust valve on #4 cylinder is bent causing the misfiring condition. I have purchased a complete kit to change the camshaft, lifters, valve springs, and upgrading the rockers to bronze bushings. I have also ordered the HPtuners ALDL interface and downloaded the software to reprogram the ECM. As of now I have spent right at $3,000 just in parts.
Dude you are brilliant! My wife's escelade just started tapping. I hooked up my laptop and no codes. When I turned off cylinder 4 the tap went away. I toyed with the idea of replacing cam, lifters, delete, etc. But I just pulled it all apart today to replace lifters and low and behold I have a bent pushrod on #4. I wish I found this video before pulling the heads because I assumed it was a lifter issue that cause the pushrod to bend. If this happens again which I'm sure it will I'll know better. Thank you for all your knowledge. People like you are invaluable and I thank you for what you do!
Thanks, I do have the pushrods to solve this issue on my site.
@@CrazedPerformanceRepair yup I checked! I will be ordering to have for the future. Thanks again!
My 2017 6.2 is in right now. #7 has a bent rod. 101k miles. Thank God for Extended warranties. Thanks for the info.
It will likely happen again soon. I offer a upgraded pushrod at www.crazedperformancerepair.com
@@CrazedPerformanceRepair2017 6.2 here as well. #4 bent push rod. 65k miles and no warranty. 2200$ repair from a GM master tech. Doing bad thermostat and leaking oil cooler lines as well. New VLOM kit lifters and push rods on one head. His tuner wants 600$ for a custom tune. Would I be able to just plug in a range technology plug to prevent it from happening again? I think I’m trading the truck in soon for a 6.6 gas AT4 2500.
My 2021 1500 Sierra Elevation with only 4.6k miles just developed this exact problem last night. Dropped it off at the shop today and won’t have back until next week.
Great video. I was thinking of buying a '21 Trail boss, but after reading all of the reviews and watching videos about the engine issues, no way would I buy one. Thanks.
Tundra and never look back
I have a 2021 Trail Boss with 8700 miles, no issues yet anyhow.
@@lamontemonnell4891 it’s coming just get the beer ready!
I bought a 21 sierra knowing this and 13k in cha bang bang in for this problem trading it I. As soon as I get it back 72k to be dealing with this nope imagine out of warranty
I have a 2011 suburban with afm. 150k miles.
Interesting thoughts, but Pushroads, AFM lifters, non afm lifters and guides absolutely the same, same part number as in previous generation engine.
And this is not only one problem with this system on L83 and L86. Afm lifters can be destroyed in a bore and major and the most dangerous issue is that they start to rotate in the guides and damage camshaft.
I had bend push roads with computer disabled AFM on my Escalade 2016.
The solve of this problem is: change all lifters and guides on non afm and block the afm channels by plugs.
YOU ABSOLUTELY DON’T NEED TO CHANGE CAMSHAFT!!!
We’ve made one Escalade and Tahoe 2016 and no misfires work absolutely great! And one more Escalade 2016 is coming.
Camshaft caps are absolutely the same. And the difference is only in 2mm in length of afm lifters with pushrods over standard lifters. But the lifter can adsorb around 14mm by itself. That why we don’t have any misfires!
Also the problem can be because of the oil pressure it is too low on 500 rpm
Around 150 KPa!
The solution is to increase to 650 rpm and oil pressure would be 208 KPa never less!
My boss has a 2021 Yukon Denali 6.2. First oil change at 7,000 miles and it was picked up from the dealer and taken right back for 4 BENT PUSHRODS
Yup, not surprised lol. Gm really messed this up.
What I don’t understand is why GM neglected to chamfer the Inside section of the active lifer that slides into the outer section to avoid the very reason it gets stuck when it goes into AFM mode!
Because then the locks wouldn't be able to hold. The thing that causes them to fail is lack of oil pressure during activation, or oil pressure when it's not supposed to be getting oil pressure at AFM side of the lifter. This causes the lifter locks to bind because the timing events and thus knurls the steel locking it up.
I have a 2021 Silverado Custom Trail Boss with a 5.3L (L82) with Active Fuel Management and 6 Speed Automatic Transmission. Super Reliable truck. The ones with the problems are the 8 Speed Models with Dynamic Fuel Management and L84 Engine.
Yikes I just bought a 2023 with Dynamic 5.3 I change oil below 7500 that's recommended and I use mobile 1 I use mine mostly highway ..... I did by the extended warranty
2018 sierra SLT...58k miles on it...engine light came on, threw code P0324 for knock senor code accompanied with a engine tick....my mechanic pulled the valve cover and found the bent pushrod almost identical to the bent one from this video. Thankfully caught it before any further damage....im probably done with GM until this is fixed/addressed...Thanks for the video.
I sell a fix, smaller diameter heavier wall pushed at crazedperformancerepair.com
Thank you for the info. Got a new Silverado 6.2, 2600 miles. No issues yet. .
How is it rocking man ?
@@Jixx45 not bad. ~4300 miles on it. 19/22 mpg. It’s a fun trick to drive.
@@undeadmonkey9122 how’s the truck now?
@@rayans9348 ~7500 miles, runs fine. Always give her a 5min warm up, remote start while i put shoes on kinda thing. Ave 17mpg, if it’s not in sport mode. Added side steps, ~250 lbs more and no engine issues at all.
Very good explanation. I have the same problem now on my 2023 Yukon with only 1500 miles and no clue from the dealer what they are going to do about it. I think they intend to patch it up with one valve only when they get the parts.
If its not under warranty, I recommend replacing the pushrods with something like I sell and eliminate the issue.
Just bought a demo 2021 1500 Chevy Silverado (5.3 ecotech3 V8, w/DFM) with 4K miles on it. I drove it for about a week and service park brake, ESC, and engine light came on along with some serious knocking. Drove straight to dealer. Finally got it back today (2 weeks later). Had a bent push rod on cyl#1. They replaced lifter, rod, and guides. Dealer says it’s fixed and that there was just a problem with a particular batch of lifters… idk if I completely buy that but we’ll see… wondering how long I have until the others go
It most likely won't take long and you will be back at the dealer. GM is rarely correct in there theory of what causes any failure.
Every 4000 miles you will get a bent push Rod. I have a 2020, 5.3L Trail Boss with 12,000 miles on it every 4000 miles I deal with a bent push rod.
@@KCIDoGIB oh gosh may be time to put on pushrods I offer and if you need to take it in for any other engine warranty swap them out with the factory ones. At least then you'll have less hassle than bringing it in every 4000 miles.
same exact thing with my 2021 trailboss, 8000 miles
Same here on my 2021 at 7,800 miles and agian at 17,800 miles. Traded for a Ford.
i bet it goes back to 2007 when GM introduced AFM. I have a 2011 5.3l have lifter issues several times. I have done regular maintenance and oil changes. My first issues with the lifters happened at 50k then at 75 and now again at 100k. I don't drive much and I only have 115k on my truck. Am I expected to keep repairing this truck every 25k miles? It sucks. Im seriously considering something other than Chevrolet.
Good luck. In the infinite wisdom of the US government, and on behalf of the corrupt side all vehicles have some form of this fuel saving garbage on them. It's not really saving much fuel anyways, it's just producing less smog during the scenarios which the epa tests are preformed. It's all a bunch of garbage to separate tax payers from thier money quicker, and force you to buy new vehicles which they can tax you for more often. All under the ruse of saving the environment. Just like the new gas cans that cause you to spill and spray gas everywhere except for the tank on your mower.
I've been wanting to upgrade my 2001 Silverado to something a little newer. I was definitely concerned with lifters though. Glad to see someone has a sensible solution!
Don’t buy one. This is rampant. 2021 Sierra. Bent rod at 7200 miles.
Get a new Twin Turbo V6 Tundra. I saw an engineering video on their new 3.5TT. My guy, Toyota over-built that thing. They re-engineered the bore and stroke ratio, they made the stroke taller which means more torque and less pressure strain from the boost. Also Toyota angled off the valves, pistons and body housing to overcompensate for the turbo pressure. I'm telling you yes I know they are Japanese, I know they are not a V8 anymore, but these guys did R&D for 14+ years to make basically a Ford ecoboost, bro you know that shit will last forever. I love V8's from sound to N/A power, but even I will admit, after seeing the over thinking and over safety Toyota put's in their motors, I'm done with all these car brands. All I buy is a Toyota now. I don't even care where the hell it is from.
I have a 2021 GMC Sierra AT4 (6.2L). The truck appears to run fine, but I have a question. I know you can "disable" the DOD/AFM by driving (shifting) to "L9". Will this help with all these bent lifters going on?
No, the bent pushrod issue happens in V8 mode.
He's right my 2021 is at the dealer for that now, I've had the fuel management cut off from day one, it will not stop it.
Just found my #4 intake rod bent and a few scores on it. I’m at 146,000 miles on my 2015 suburban. Other lifters on the passenger side still look ok. It looks like this engine has been worked on before I got it.
Have heard it could be too high of oil pressure. Thoughts?
2021 GMC 5.3l with 5,022 miles. Bent push rod and had to replace all 16 lifters. Took dealership a week to fix.
5006 miles 2021 GMC 1500 Denali Just happened and lifters are backordered
Same with my 2021 suburban. took 5 days for parts to come in. another 3 days to fix. she was around 7,800 mi
I have a 2017 Silverado ltz with 6.2. I bent a 1st pushrod at 115k. No misfire or code, just valvetrain tick. Replaced it and now it’s ticking again 2k miles later. I turned off the AFM after 1st bent pushrod. Going to go look for your pushrods now.
Very interesting concept. And if it’s true I would love to get the pushrods replaced before failure. Or during repair after failure. However with a 2021 truck either of those options would void the warranty. So we are kinda stuck with the faulty design :((
Most people believe a range disabler prevents the lifters from going since there isn't the shutting off or start and stopping of the cylinders. What do you think of this?
My cylinder 7 lifter collapsed with the range installed.
I had a bent pushrod on my 2015 6.2 high country 217000 miles but I’ve ran it with a direct port range chip for a afm delete i probably think it helped me delayed this bent or collapse pushrod or lifter problem right now im doing a complete dod -afm delete with the respective tune i hope this solution help me keep my truck a bit more longer, i like the video and subscribe! Good information !
Hi, Just bought 2012 GMC Denali with 6.2, 130K, seems ok thus far, anything you can recommend to keep stable for a few more years? I just bought the Range AFM disabler. Is Mobile 1/K&N oil filter wise? Thank you for any guidance.
2021 GMC, push rods are good but I have a collapsed lifter. Does your tool work on the DFM or just the AFM?
Just AFM as far as I know. I have yet to get my hands on the DFM system.
21 Silverado here, 7k miles. Knock on wood no issues.....yet. Changed oil at 5k to Pennzoil Synthetic and Wix filter. We'll see what happens. I did also install one of those Autostop Eliminators.... Fingers crossed!!
I just saw a random tic toc a video that showed a 2021 with 5000 miles with bent push rods, at the dealer. I'll stick with my 6.2 and 6.5 diesels, and my Corvairs. My Mercedes and BMW? Those are another story
Lol, send the tictoc guy over.
Did you ever come out with the alternate push rods for the AFM engines? If so, please provide a link. Thank you for your informative video.
www.crazedperformancerepair.com/product-page/pushrod-upgrade
I'll add it to description as well if I don't already have it in there.
My son bought a 2021 Suburban and because of the Chip issues the truck dont have AFM. Im wondering if they installed standard rollers lifters or the DOD lifters are there just not controlled. What do you think? Thanks Mike
I would think that they would try to save cost and go standard. However, if they built the engine first then found out there is a shortage they definitely would not pull the AFM parts back out.
2015 silverado 5.3 Thanks for this explaination and I agree with what you are saying. Last summer I thought I had a stuck lifter on the passenger side. When I pulled the head apart and examined the lifters none were in the stuck position but I did find a bent pushrod. I replaced the lifters anyway along with having the head cleaned, replaced the guides and pushrods. Now this summer, the driverside has a tick and Im thinking bent push rod. Hopefully it is because its a much easier fix... I'll follow up later this year.
I do have a pushrod upgrade available now that should solve the issue.
@@CrazedPerformanceRepair may l ask why your push rods won't bend like mine original one?
@@marekkrepa9982 they are just slightly smaller diameter so they won't interfere and they are much heavier wall so stronger.
Hello, army veteran here, 8 years wheeled vehicle mechanic, been a gm tech the last ten. AFM lifter failure very common. Personally I think the lifter fails which then causes the push rod to bend. See a lot of these fail due to lubrication issues, poor maintenance or failed vlom, weak or failed oil pump. Under warranty we replaced all lifters on the same bank, push rods as needed..
I've seen people go to the dealership to get the lifters replaced because of a bent pushrod. They later on bend another pushrod and buy my upgrade. I've also seen them bend a pushrod then upgrade to the version I offer and end up with a bad lifter later on, likely because the pushrod is stronger than the failing lifter. That bad lifter did only happen once though. Perhaps it was a coincidence or fluke.
Every single one of the bent push rods I have seen though, has some sort of side interference on them. This indicates it is interfering with either the head or the AFM lifter spring. Any interference like that can cause a harmonic deviation and thus bending a push rod. The ones that I now sell are a smaller diameter heavier duty pushrod. This adds more clearance to prevent the contact and stiffens them up to reduce the harmonic.
My 2021 Silverado RST is in the shop right now with this problem. I'm a stay at home mom with stage 4 colon cancer if that let's you know how its driven. Not driven hard at all. My husband got in it to go to Home Depot and got half a mile and it was knocking so bad he brought it home and parked it.
I have a 2020 Silverado and heard that this was only happening to trucks built from Sept 2020- March 2021… I will get repaired through recall… my question is if I’m at 29k miles with no issues at the moment … should I go ahead and this done to prevent anything from happening ?
I got a 2017 silverado with the 6.2 and it had a bent pushrod on #7, in the middle of the DOD delete right now. Its a PITA but i hope to have a nice reliable truck after this!
Well I just bought a 2021 rst with a 6.2l. I heard about this problem but bought one anyways. It’s my favourite looking truck right now. Hopefully it keeps running good. The 6.2 is quite the mill, fun truck to drive.
GM messed up their reliable engine reputation starting in 2008 with the first DOD motors. Its been all downhill since.
THIS INFAMOUS SYSTEM STARETED IN 2007!!! THE END OF THE GREATER TAHOE!! ME, I KEPT MY 2006, AND I LOVE IT
Yeah after the 08 recession gm has gone downhill
Ls1 ran over 800000 miles they had to get you in the service department somehow
@@arturovalderrama4626 I disagree. I have an 07 Tahoe with 170k. She's been amazing.
Agreed my 02 6.0 Silverado runs like a champ with over 220k miles 👍🏿👍🏿
@CrazedPerformanceRepair do you think an AFM disabler would work for a 2016 Yukon Denali xl? Just got it back from the shop bent push rods at 40,000. I loved this car and was planning on getting another, thanks to your channel I have changed my mind.
Excellent information. I don't currently work on this gen engine but have a feeling I will be. You should put out a video on the products you've commissioned/ suggested for the afm/dfm preventative maintenance/ mods
I have a 2017 Escalade 6.2 motor, do I need to buy 8 rods to replace all of them?
How does this system work? Does it hold the valve open during a compression stroke to stop building compression or does it leave the valve closed.
I would think in the new system using all 16 lifters it would leave the valves closed before the compression stroke. No air in no compression.
If there collapsed do they release the collapse between compression strokes? If not how does it handle the cam lobe hitting the lifter while collapsed and the valve closed. There would be nothing keeping tension on the pushrod. It would be bouncing around like crazy.
Something missing here. If the collapsed lifter is spring loaded with enough tension to keep the pushrod in the lifter and set in the rocker arm but with not enough spring load to actually open the valve then I can see how this works. But there always has to be tension on the pushrod or it would drop out of the rocker arm and that would be catastrophic….
You may be right about your bend theory. But I think there is still an issue with when the lifter is collapsing and when it is supposed to extend.
A small amount of slop during the collapsed mode and the extended mode may be enough of a shock when going from collapsed mode to extended mode when you plant you foot to the floor. RPM would rise rapidly. If the push rod bent it would produce a mark on the pushrod on the opposite side of the bend. Because it would be leaning that way and hit the side of the lifter.
Is this system actually capable of changing modes fast enough over and over if you have a heavy foot and invoke full throttle from light throttle.
Or if you are in tow/haul mode and the transmission does some aggressive down shifts.
I do not think locking and unlocking a lifter with oil pressure will ever work to be able to control a valve.
Bad idea from the start.
So this happened to my 2019 Suborban with the 5.3,. Less than 60k miles. Heard the loud tic and the pushrod was a boomerang. Had a newer GM pushrod fail on a gen 1 SBC right after a rebuild as well so a combo of bad geometry and possibly poor contrsuction. If you have one of these order the kit NOW and disable AFM. The dod delete kit is a daunting project either on the wallet or on your back.
We just purchased our first new vehicle in June 2021 - a 2021 Chevy Tahoe RST with the 5.3L engine in it. Do we have any feedback on this engine in this vehicle? Are there any stats as to when the bent rods are materializing and under what driving conditions (maybe similar to mind)? I'm on the road daily for my job and drive at high speeds 60-80MPH. Since we purchased the vehicle, I've driven just over 14k miles. I know, amazing, but this is the kinda miles and speed that I will be putting on this vehicle on a daily basis.
Should I, or can I replace all the pushrods with your upgrade. Also, 8 dollars versus the 100 you discussed, thank you
i'm in the market for a 2010 to 2015 yukon denali xl. after watching a bunch of videos on the problems the gmc v8 engines have, i'm thinking maybe i should see what ford has to offer
I did a “patch” job on my 17 Sierra 6.2 to get by until I could do an afm/dod delete. Replaced the no 4 afm lifter and pushrod, and lifter tray. Lasted about 2 months. The lifter wasn’t collapsed, but the pushrod looked identical.
its a interference issue. I offer smaller diameter pushrods to help with the issue.
@@CrazedPerformanceRepair does this mainly only happen on the AFM cylinders? What’s your website btw?
@@CrazedPerformanceRepair never mind I found your website. Placed an order for 4 pushrods. Had an error with payment, tried to resubmit and it said it was still processing the previous payment. I’ll email or call you tomorrow if it doesn’t look like it’s going through.
your correct about bigger issues. ive done close to 20 2019+ new body gm trucks. lowest ive done is 300 miles highest ive seen is 70k. at one point headgaskets and hp fuel pump lines were on national backorder. gm decided with this "chip shortage" starting at march 2021 their wont be anymore HD radios in any trims in any gm vehicle and wont have the bs lifter stuff.
and when doing warranty work can only use "gm" designed stuff. gm did have a massive recall on the lifters themselves and have an "updated" design for the new said lifters. only able to do the one side thats having issues cant do both sides even though we know its going to come back in so many miles for the other side. ive done a couple where i fixed one side and a week later same customer back with same issue except its on the other side. its gotten bad
I'm a Chevy mechanic. My best advise to avoid this common problem is a Ford F-150.
Are you seeing this problem more on the 6.2L or 5.3L engine?
I would go Toyota
I'll push a Freightliner before I'd buy a Ford anything ✌️
Lmao
@Here 2Learn I've never been a chevy guy til recently, those coyote engines are as good or better than gms LS engines.
My 2021 GMC says it has no type of fuel management system. Could I still have a problem w it?
Just traded my 2020 Chevy Trail Boss 6.2 because of this. Went back to Cummins.
Brand new GMC 2021 Sierra 1500 4k miles in and push rod bend. Now at the dealership getting fix.
What r the chances of this keep happening??
I owe 2021 Trail boss and now my truck is broken down same issue it's also low mileage less than 4000 millage
Ouch, yeah that sucks.
I have 2 issues in my truck misfire cylinders and temperature sensor circuit high
We have a 2016 Escalade ESV platinum with 95K and it keeps bending the pushrod on cylinder #4 over and over even after a fully AFM delete and a full lifter rebuild and replacement. So expensive and frustrating!! We are going to upgrade all the pushrods to these stronger ones and hope for the best! Screw GM!! 🤦♂️
Good call, the smaller 5/16 performance pushrods offer more clearance and stronger design.
currently doing a delete kit from BTR with stage 2 cam. I had trouble finding a tuner that worked with OEM computers so I have self taught using HP Tuner
I wish I had known about this 2 years ago before buying my used 2014 Corvette. Engine was blown and had to be rebuilt associated with the bent pushrods, bad lifters, and damaged heads not to mention excessive carbon buildup among all other damaged parts. Repair total came out to be $13k. Thank goodness I bought an extended warranty for the motor
I now offer a pushrod to take care of the bending issues on my website. Smaller diameter and heavier wall tube. Reduces interference issue by making diameter a bit smaller.
i had this tick sound BS, pulled the valve head saw a couple rockers with play, pulled the one with most (only 5mm of movement) saw rod bent (bent it straight) now ticking sound is gone. but imma go ahead & plan lifters, and rods replaced and probably cam too. but saw this vid after my own diagnose. My 2017 escalade only 97K miles.
I have a 2019 Chevy Trailboss custom 5.3 with 6 speed and older tech 25,000 miles no issues Inknow many with the newer 6.2 that are having this issue so your saying the Active fuel management is the reason this is more common and the engines that just shut off to 4 cylinders are less likely to have issue ?
2015 6.2 silverado. just pulled my rods today. 3 were slightly bent. The rod above the failed lifter was extremely bent to the point that it was wedged inside of the head.
Yikes, don't forget to upgrade those pushrods to hopefully prevent the issue in the future. I offer them at www.crazedperformancerepair.com but if you can source them elsewhere go for it.
It's 2024 know how's the lifter thing going . Hove you come up with a price . And I do have a bent push rod . Is my lifter OK.
I have 2015 chev Silverado 90k bent pushrod # 6 intake .I replaced pushrod and added 3k highway miles .engine started to misfired after a week driving around town .I had the same push rod bend again and lifter is destroyed .
2021 Tahoe 5.3 with 12K miles. Bent push rod. Just found out yesterday. Dealer said its very common and they dont have the part.
how is there no recall on this problem? seems to me it is happening a lot on newer design GM engines.
Not a safety issue.
There is a TSB coming from the dealership. But there is a lot of national back order and we usually don't get those lifters until around 2 weeks average
They know it's a design problem. GM should have to pay 100% to fix any engine no matter how old.
Stuff like that would rarely happen if they had to recall and pay rather than making money off the poor sap they sold one to that didn't know about the likely intentional design flaw.
Dear @CrazedPerformaceRepair,
I have 2021 GMC Yukon Denali 6.2L, with one bent pushrod. I changed the rod and the lifter (altough it was good). After the first start of the engine, the problem was the same because I checked the pushrods and the new one was bent.
Could you please give me some advice to solve this problem?
Thank you in advance.
Best wishes,
Dániel from Hungary
I offer upgraded pushrods on my website www.crazedperformancerepair.com/product-page/pushrod-upgrade all the info you need is in the description.
@@CrazedPerformanceRepair Thank you!
Hey buddy awesome Channel I'm DieHard Chevy guy been looking for a new Silverado and noticed that they're offering non-active fuel management in Canada right now but I think same eng parts just electronically deactivated
Pretty sure they mechanically removed the system as well. It's much cheaper to put non DFM parts in and since they have them for other models why wouldn't they? I'm willing to bet they are full non DFM.
I hope this is true. I have a 21 Trailboss with 1500 miles that came facory without dfm. What happened to the days of solid lifts
I bought a 5.3 Silverado 2021 w/o dfm it only has auto start/stop. Which I turn off when I start up.
I've had my 2007 Silverado 5.3L since new, always serviced myself, always used Mobile 1. Thought she was bulletproof up until a couple of weeks ago at around 447,000 miles. The lifter tick started, then a couple weeks later suddenly started running horribly, missing. Code shows misfire on cyl 6. Removed the valve cover to crank by hand and check for a loose rocker, but NO loose rocker at #6. Just immobilized rocker. Bent push rod? Thought I was going to buy the "tool" and free the lifter, but now IDK. Please help.
Any suggestions if there is no check engine light on and the truck runs great?
What's wrong with it? It's best to message me on my website.
How do you determine if the rod is bent? It's not visually apparent. I put it on a straight edge as well. Doesn't seem bent. Still throwing the 306 code. New plug, New coil, New injector. Lifter is working and operating the rockers and opening the valve. I did have the injector oring issue you mentioned, I replaced the injector and the oring.
I'm at my wits end with this thing! Help!!!???
Did you check rocker movement while it was running or while cranking it over a while using starter relay? You could have a spun lifter that stops working as soon as oil pressure is present.
I have a late 2021 Silverado with the 5.3L with DFM. I called the dealer to ask what I need to do because there is a civil suite against GM. They asked for my VIN # and they looked it up and said that my truck doesn't show that there is a problem. So now I am more concerned, are they basically saying we going to do nothing till it breaks ?
What do you think of the trucks coming out with no afm/dfm due to the chip shortage? Interested.
I actually just published a video on the topic little over a week ago.
Hey your video are super helpful thank you! I have a question however. I just pulled the head on my 2014 Suburban on the passenger side. My old afm lifters spin inside of themselves. But the replacements do not. Why is that?
They have the pin that doesn't allow it. Not sure why they did that. I do know those are the ones more likely to fail though. Since they don't rotate they beat up on the same part of the shelf all the time rather than the entire area of the shelf inside the lifter.
@@CrazedPerformanceRepair thank you for your response. That's sad to know as I closed it all up yesterday. It did however run better than it did when I bought it. Thanks to you and your vids.
Did you ever make the push rods if you did please help how do I get thank you
I bought a 21’ Chevy custom trail boss that is non AFM. Is it still gonna be a problem?
With pushrods, possibly. They not only hit the AFM/DFM lifters but also the heads. BTW that year should have DFM rather than AFM if it's equipped with something.
thanks for keeping us informed.
I do my best with what time I have :)
Bought a 2021 Suburban Z71 in January... 2 days ago, with less than 5k miles, I limped to the nearest Chevy service center. I was told that it's likely a collapsed lifter and they'd need it for at least a week. To add insult to injury they gave me an Equinox as a loaner - extremely tight fit for my family. Furious is an understatement. What if anything should I address upon pick-up? How likely is it to happen again? I want an extension on my warranty 🤬
Gm used the incorrect pushrod diameter from factory. If bent pushrod happened to yours it will happen again unless corrected with non interference parts. I do offer a solution on my sight but unless dealer is ok with it you would likely void the warranty using them.
I installed a new cam and lifters in a 2010 yukon. Its cranks and dies in 5 seconds everytime. I went with a 3 bolt cam and removed the single bolt vvt cam. Dod has been deleted, does vvt also need to be deleted or or do I have a bigger problem?
Vvt has to be tuned out and hopefully you did the non vvt timing cover and 4x reluctor gear.
@@CrazedPerformanceRepair I did use the 4x reluctor and non vvt timing cover but did not get vvt tuned out. I will get that done. Thanks for the info.
@crazedperformancerepair Do you know if this lifter/push rod issue affects the diesel duramax engine option on the 2021 models?
I'm fairly sure it doesn't.
I have a 2014 with 130k, The engine a 5.3L so far runs like a clock but I just had my transmission replaced! Scotty Gilmore has shown numerous videos on how GM quality has declined each year since 2013. Damn shame especially since the price has not declined the exact opposite matter of fact. A top of the line crew cab Z71 silverado 2500HD is around 75k that is criminal!
Your one of the lucky ones then seems hit or miss on weather or not they interfere from factory. Edit: Just realized you said 2014, those don't seem to have this issue. It's 2017 and newer.
my 2011 ext with 150,000 just did it
Transmissions need reprogrammed too. In their infinite wisdom they crawled into bed with the EPA and get a higher mileage sticker for the window when they come up with these DOD, AFM and slipping on purpose converter lock up clutch ideas. They don't care what it costs you, it's yours now. They only care about competing with the highest mileage sticker they can get so they propose that if we let the converter clutch slip 10% in high gear how much is that worth? EPA says how about 3 mpg? Deal. And you are buying a worn out converter that shudders because they told it to wear itself out early by controlled constant slipping. Fills your oil with metal parts eventually and there is zero hope that it ever has a good ending for your wallet. You need high level programming tools to make it slip 100% in all gears except for high and there it slips 0%. A lock up converter was supposed to be the ultimate in economy, but GM doesn't care who gets screwed as long as they can sell vehicles. Hiram on the Automatic Transmission yt channel does some of that reprogramming, high end shops should already have the equipment to do it. Crucial that the temp control for the cooler gets bypassed, they just don't work right for very long and when they don't work, they have zero cooling - how long is that gonna last? As if it were designed to fail in "burn it up" mode.
So my 2021 gmc says is not equipped with dfm......do you think all the valves and pushrods will be ok??????
Might not be, turns out some of them are also inferring with the cylinder head as well. If you have over 10k miles on it without issue you should be good at least for a while.
Will adding the Edge Pulsar that shuts off the DFM help with the issue, or is it pretty much a push rod only issue. ???
No, it is an interference issue between pushrod and other components.
As far as the LT4 engine, does this issue occur only in automatic transmission vehicles, respectively do the manuals (Z06, ZL1) also have cylinder deactivation?
It happens to all the newer V8 gas engines except the 6.6 I believe. It happens without AFM as well.
My 2021 6.2 Trail Boss with 13k mikes has lifter problems. Been in the shop for 3 weeks with no eta on parts. Over a dozen vehicles in front of mine have been there for 6 weeks.
2015 Silverado 5.3L I also had lifter failure 2 time in one month this year
unfortunately I had same problem . does this problem cause more problems if I didn't fix it soon? or it is just the knocking noice
It will certainly cause more issues if unfixed. It's literally a hammer smashing metal together inside your engine.
@@CrazedPerformanceRepair noted ✅ thanks
I have an 09 silverado hybrid. If I use HP Tuners and turn off the DOD, do I still need to mess with the VLOM or Cam / Lifters at all? I can't seem to find this anywhere.
That's because no one has the ability to turn AFM off in the tune in the hybrid. If you had a lifter fail, you are going to have to replace lifters and address the source of the lifter failure. They fail from lack of oil pressure during activation.
@@CrazedPerformanceRepair what I'm trying to find out, is why the VLOM needs blocked? Say I had a normal truck. Fully working. Why couldn't I just disable DOD in the tune, and drive the truck that way? Like in an attempt to prevent the lifter failure from ever happening?
We had 2 2015 Sierra come in with a misfire and engine noise. Both had cylinder 6 misfires. Both had a bent pushrod. We replaced all 16 pushrods and lifters with GM replacement parts. The AFM lifters are getting VERY difficult to get.
It's an interference issue most times. Smaller diameter pushrods like I sell seem to fix it.
Well I hope my 2022 Z71 doesn’t get a problem I have the l84 DFM system I hope I didn’t make the wrong choice
Just had the issue on a 21 Trail boss, less than 5K Mi. Dealer had a 4 day turn around and replaced all the lifters.
You will probably be back for warranty again soon unfortunately.
GM has their heads up their butt as far as fixing things. They think the oil consumption on the older generation is from a oil relief valve in the pan. It's been from the PCV system due to a valve cover issue the whole time. They have a TSB specifically for the oil relief valve. And that's just one example.
There are how many of these engines out there? And what% have shown bent push rods and lifter failures?
Cant give a % but I sell a set of aftermarket pushrods almost every week.
had a 17 sierra with 95k kms that came in with a tick and a miss on #4. pushrod was bent on the intake valve and afm lifter was in pieces. did all 16 lifters and guides, and replaced the 1 pushrod with all stock gm stuff. back 1000kms later with a tick again and the brand new push rod in that same hole is bent again. lifter appears to be in tact looking through the hole in the cylinder head. not sure what to do now lol.
how about arange afm disabler you think is safe to use?
It's ok to use but won't help with this issue.
I have a 2021 5.3 trail boss with no afm and a 6 speed transmission. Should I worry about this issue?
It may or may not be an issue. If it happens once it will happen again unless you upgrade the pushrods. Without AFM/DFM lifters it has less chance of the issue but can still happen. Some of these are hitting the pushrods on the hole it goes through in the cylinder head.
My 2021 escalade wth 3k miles was dropped at dealer for lifter rod knock.