I do appreciate the fact that you get strait to the issue at hand and not just talk for half the video about things that don't pertain to it. Thank you.
Your coaching is particularly good due to the fact that you are coaching us AND zooming in video to demonstrate how to tap into the circuitry . Thanks !
I thought stuck lifters was caused by bad oil like taking too long between oil changes? I have a gmc 2007 5.3L and my lifter on cylinder 7 got stuck. I have them all out now and will replace all of them. What do you recommend to make sure my afm lifters dont do this again? Im gonna buy a new updated vlom as well. Thank you.
@@paquesepas6696 I have the same truck. it was cylinder # 4 on mine that had a stuck lifter. replaced AFM lifters but it was too late, valve was burned. had to re do the job and replace the valve. then a year later the same thing happened and the cam was destroyed. I had to replace cam and lifters with non AFM type and reprogam the PCM to defeat the feature. it's all better now with 141,000 total miles.
Very informative. Your explanations make sense. You explain in way where you are in-between someone who knows nothing about cars to experts. You find that middle ground very well.
Thank you so much for putting this video out!! I've been having issues with my truck for awhile now and you just gave me information I haven't been able to get out of any mechanic I've taken my truck to. They just trying to suck what little money I have and NOT fix the problem. They also tell me crap that I've known was BS! THANK YOU THANK YOU THANK YOU!!
I learn so much from your videos have a solid 40 + year mechanic background but suffer from lack of experience at times on new technology..you explain straight forward without excess information that boggles this old noggin I watch your content and have a better understanding of the big picture and more confidence to ,at times stumble, through diagnostic testing and eventually have that light bulb moment and ,GOT IT !!! Thanks and keep up the good work 👍👍👍
You never disappoint Great job as usual. As a shade tree mechanic i have to take my truck in for issues like this. without the scan tools i dont have a chance.
Amazing videos like always. I have never seen someone so detailed and knowledgeable. I going to use your videos to help me work on a BMW that has an intermittent start. Cranks but no start. Thank you for the great videos #XTOOLGIVEAWAY
One tip from another SO scope user. Please don’t stack your grounds in the scope like you did. Put the single banana jack on the yellow lead in the scope and stack the other grounds together away from the scope. This will parent your scope from damage if you hit it or drop it. Great video overall. Smashed that like button too
Great video! The only thing i would have added to the diagnosis would be to put a borescope in the cylinder to look at the valves, then bumped the key to pressurize the fuel rail and see if the injector was leaking by ... Thanks for sharing.
Excellent video, Thanks! This is where a transducer in cylinder is really helpful. I would gladly pay for a premium channel with you, you give really clear explanations!
Easier would be to just use differential pulse sensors at intake and exhaust and watch the waveform; will tell you exactly which one is misbehaving; clearly a valve not seating right; worn rings are usually very consistent.
@scientist100 Agreed. Totally forgot about that one as I was watching. So for sure. Pulse sensors in intake and exhaust would probably be easier. The trick is always in waveform interpretation. But a dead hole should be real obvious. In a case where a cylinder is not being identified through a DTC. How would you know which one it is? I'm assuming the trigger being used would be an ignition trigger. But from my understanding that trigger will not align with either the intake pull nor either exhaust pulse. Would you be looking at the intake pull right before the trigger?
@@edwinlomonacofoolsend yes; it is important to use the TDC overlay and specify your trigger and firing order but here we already know that it is 8 and whichever looks abnormal would automatically tell us which one is failing. Cylinder identification whether intake or exhaust for a certain cylinder is necessary. Tapping into the exhaust side; you will confirm if it's an exhaust valve but the intake waveform will show both usually as it will back feed pressure if it stays open during compression.
@@DylanL69 I don't know how much you know about oscilloscopes but you can clearly see that the valve sometimes seats correctly as it can get good compression at times and you know what that means... You will get lucky if you get it when it is not fully seating to do a leak down test. Unfortunately; a leak down test may not prove anything. Pulse sensors just needs an intake access; usually a PCV hose and that's all.
great video on diagnosing this issue i totally agree with it . I would be 100% positive that it is a valve seating issue, with a small bore camera you would be able to see inside the cylinder without having to take it apart. just a tip . Good job.
Just had the same issue on a 6.0 Chevy truck. It had very bad intake vacuum leaks on cylinder 4 and 6 causing misfire and lean codes. But repairing it only lead to no more lean codes, but the misfire codes returned. Intermittent compression loss on cylinder 4 which reduced at higher engine speeds. Sometimes the valves stick in the guides, lifters and cams also fail, but this engine was very clean. Customer also declined further inspection. Hate not knowing the exact cause, but that's our world. :)
X2 giveaway... I enjoy these videos very much! For everyone you it's clear you spend a lot of time on editing and clearly making them. This is much appreciated by me at least. Keep making them and watch everyone.
i'm a long time subscriber of your show. You've taught me a lot about using a scan tool. i''ve always considered myself a shade tree mechanic but those days are gone. Thanks for sharing your knowledge of the tools we have out today and how to use them. I would like to be in the running for the x tool giveaway. Kee up the good work. And keep putting out the good videos. Thanks.
I think I heard the unevenness when it was cranking,If I'm not mistaken. And all this time I thought that relative compression meant that compression is relative to the spark. No one ever explained before that it is relative to each cylinder. Thank you for saying that little piece buddy!!!!!
some diag guys dont know this, some cars will shut off the fuel injector in a multiple missfire situation, bmw is one of them, i have seen guys call a bad injector because the ecu is not triggering the injector to stop cat damage and bore wash/engine damage, id say it is a typical valve not sealing issue. good call eric.
I was thinking like you with the valve sealing problem. One more thing would be a weak valve spring or a sticking valve. GM had problems with valve guide problems in the past. I have seen a valve seat problem. It took many miles for the problem to occur, but at idle the engine would lope turning on the MIL light and yes, gauge compression and cylinder leak down was good compared to other cylinders. This was before scope testing. The engine was a 1997 Dodge 360 (5.9L) V8. Contacting Chrysler for information, they claimed it was a "metallurgy problem." The fix. Replace the cylinder heads. The reman heads had the latest and greatest in valve seats. Engine ran great after that.
Thank you I passed on buying a 2010 Tahoe at a bargain price with multi misfire code do to not having the tools to determine what was happening. Thanks for the oil info. Great job Bill in Massachusetts
Ty for explaining this problem issue and that's wats going on with my truck now. It didn't pass smog took it to a mechanic he said it was the #8 misses fire sometimes but it the time I just don't have that $For the extra work which consist of opening the motor and taking a look. Smh.
The 5.3L is known for AFM lifter issues but #8 is not an AFM lifter. However, they can stick and jam up internally which will cause a lifter tick. If they are not hearing a lifter tick, I doubt that's the issue. I'd be looking at a bent or sticking valve or a broken valve spring on #8. They might be able to detect a sticking valve by running or even just cranking the engine with the valve cover removed.
my 6.2 has been at a GM dealer for 8 days now with #8 miss. no code. they can't figure out why because they say it's intermittent. already ruled out coil, wire, plug, injector. valve cover off now and nothing obvious. They want to pull the head and check valve and or guide. maybe check push rod BEFORE pulling head? , what else could it be?
I love your channel and have been watching your TH-cam your a few months, I followed your steps to do programming Ford ABS module and it works great:) thank u for sharing your expertise. I bought a think pro OBD and they scan great but I can’t use their special functions 😢 it won’t work! I’m disappointed bc I want to able to do more with the relearning…thanks and continue your good work!
I wish I had seen this video 5 months ago to get a chance to win that scan tool. Anyways, great video. I currently have an 08 5.3 with low compression on cyl 2. I did use a mechanical gauge and did not hook up my scope to it. But now with your video I think I will grab my Autel and scope the cylinders, I'm certain I can do it. But not for free. So if my customer says he will pay for this test i'll post my findings here and I will post if he declines the diag. Great video!!!
Thorough , logical diagnosis and great lesson . I believe they swapped coils and injectors to test instead of replacing ALL of them . Saves money there . If there is access , how about putting a small articulating bore scope in # 8 cylinder and possibly examine the valves and seats ? It may be faster than doing a leak down test on that cylinder . #xtoolgiveaway .
Im having the same issue but on cylinder 4 after lifter replacement. Replaced coil, fuel injector, spark plug, and spark plug wires. Still have the misfire.
Do a compression test on that cylinder and always use gm original parts on the parts you replaced. You can also take off that valve cover and inspect the rocker arm for play etc.
I appreciate the videos . . I not sure what is going on with the compressor. I be guessing. Is cylinder 8 one of the cylinder that is used on the active fuel management..I think I would want to pull that valve cover off and watch the rocker arms movement when it's cranking over . . What ever the problem is eventually you will find it
Great video, thanks for making it. Im definitely going to and recommend other to follow you. I have 380k miles on my 2007 Yukon. Have misfires on #4 & #6. Recently replaced the oil pump, pickup tube, timing chain, cover, water pump, radiator, all 4 O2 sensor, coil packs, plugs and wires. Radiator blew and it ran hot for a few minutes. Glad i changed the timing chain. The guide on the passenger side was at a failing points. Came apart when i took the guide bolt off. Question, when using that start relay. Does the key in the ignition need to be turn like in the start position?? Again thanks for the video!!!
Hey buddy. Love your videos. You have a scanner suggestion that’s as the best bag for you buck. Is there one that also does cake key programming you recommend?
Nice video and diagnosis Eric. I guess with Chevrolet having lifter issues it could be the beginning of a collapsed lifter. Unfortunately, for the customer it’s a lot of labor to disassemble the engine. I guess they will try a mechanic in a bottle. #xtoolgiveaway
Eh, I prob would have chased a partially wiped cam lobe on that one. Might be able to see a difference in rocker rise when cranking over or a little engine noise.
You mentioned several possible reasons for the mechanical misfire.Would a look in the cylinder with a camera help to eliminate some possibilitys ie valve seat, burnt valve etc. wrench the engine over and look?
You seem like an amazing mechanic, I understand you are located in Houston but I would love if you could send me the location of your shop or the name, so I can swing by for you to look at my car which is having problems, thank you.
PLEASE READ! I had the same issue on a 2011 5.3l it was on Cylinder 6. I recommended removal of the Valve Cover for inspection and stated it may be possible lifter. Customer took the truck, Apparently, our shop quote was too high if it needed all that. Customer took it to the shop next door. Their Diagnostic tech found a bent valve for that cylinder. So this is where it gets interesting.... They kept the truck for a whole month. And i was eager to know what was the issue. So turns out, they did the whole head job on both banks, replaced valves and still was misfiring for same cylinder after they had it all together. They did their checks and took it all apart again. It was a bad exhaust lifter for that cylinder and had rounded out the cam lobe. Made sense since sometimes it would seal and sometimes it would lose compression. Their Jr. Tech is friends with one of ours and he confirmed it. Dang.
I had a misfire on 8 switched coil and misfire moved to Cylinder 5, replaced that and it moved to 4. What may be going on? I pulled wires one by one to check spark.
Dangit, I was hoping for a smoking gun!!! I have a '99 Silverado, 5.3, 144k miles. So no AFM or VVT. I don't have a scope available although I can use one. So here is my story. Cylinder #3 miss at idle. Previous owner replaced plug wire and intake gaskets. I tested compression and it was 125psi on #3 and 145psi on #1 and #5. I thought possible cylinder wash so I ran it for a bit with the injector unplugged and #3 came up to 145psi. I replaced the coil with a good used coil, it has strong spark, swapped spark plugs between cyl. #1 and #3, swapped injectors between #1 and #3 but before that I checked for injector pulse which it had. I smoke tested the intake and found no leaks anywhere. There is a very faint bit of valvetrain noise but it doesn't sound like a problem. No lifters rattle on start up. I even went as far at to exchange the injector wires between cylinders #1 and #3. I know this makes the injector timing horrible but I thought possibly if the miss followed the wiring it could be an injector wire that was weak enough to fail under load but not weak enough to fail with a noid light. But the miss stayed at cylinder #3. I haven't pulled the valve cover yet. I'm hoping for possibly a bent push rod or failed rocker arm although as I stated, not real valvetrain noise. If that checks out what would you recommend? I've worked on these engines since they were new at the dealership and thought I had seen everything. But this one has me scratching my head.
I have the exact same symptoms on my 2004 Silverado 6.0 liter The only difference is if the truck is warmed up, after 5 minutes or so driving, all random misfiring disappears. Could this possibly be expansion of a valve seed or some other component that results in better sealing which eliminates misfire? Or perhaps going from closed loop to open loop? Expecting a pinpoint diagnosis. But what would cause the symptoms to disappear after running the truck for about 5 minutes? I live in Florida so there's no extreme cold temperatures
I’m having a problem with my ram 2012 1500 I live in Arizona randomly shuts off how can I get a hold of you took it to multiple shops has new tranny new sparks plugs coils and throttle body cleaning please help !!
I do appreciate the fact that you get strait to the issue at hand and not just talk for half the video about things that don't pertain to it. Thank you.
Your coaching is particularly good due to the fact that you are coaching us AND zooming in video to demonstrate how to tap into the circuitry . Thanks !
Another great vid, Eric! Please keep them coming! God Bless!!!!
Thanks! Will do!
GM mechanic here, see this every day, I got my money on lifters and possible cam damage. Do them every day! Great video
I thought stuck lifters was caused by bad oil like taking too long between oil changes? I have a gmc 2007 5.3L and my lifter on cylinder 7 got stuck. I have them all out now and will replace all of them. What do you recommend to make sure my afm lifters dont do this again? Im gonna buy a new updated vlom as well. Thank you.
@paquesepas6696 castrol oil and 3k -3500 oil changes. About to roll 200k on my 09 and not one issue
@@njr684 agree
I have a 2017 and has 129k and do oil changes every 2k miles to be safe. No issues yet
@@paquesepas6696 I have the same truck. it was cylinder # 4 on mine that had a stuck lifter. replaced AFM lifters but it was too late, valve was burned. had to re do the job and replace the valve. then a year later the same thing happened and the cam was destroyed. I had to replace cam and lifters with non AFM type and reprogam the PCM to defeat the feature. it's all better now with 141,000 total miles.
Excellent diagnosis, I like the way you systematically break down each test that you are going to do
Very informative. Your explanations make sense. You explain in way where you are in-between someone who knows nothing about cars to experts. You find that middle ground very well.
Thank you so much for putting this video out!! I've been having issues with my truck for awhile now and you just gave me information I haven't been able to get out of any mechanic I've taken my truck to. They just trying to suck what little money I have and NOT fix the problem. They also tell me crap that I've known was BS! THANK YOU THANK YOU THANK YOU!!
I learn so much from your videos have a solid 40 + year mechanic background but suffer from lack of experience at times on new technology..you explain straight forward without excess information that boggles this old noggin
I watch your content and have a better understanding of the big picture and more confidence to ,at times stumble, through diagnostic testing and eventually have that light bulb moment and ,GOT IT !!! Thanks and keep up the good work 👍👍👍
You never disappoint Great job as usual. As a shade tree mechanic i have to take my truck in for issues like this. without the scan tools i dont have a chance.
Amazing videos like always. I have never seen someone so detailed and knowledgeable. I going to use your videos to help me work on a BMW that has an intermittent start. Cranks but no start. Thank you for the great videos #XTOOLGIVEAWAY
One tip from another SO scope user. Please don’t stack your grounds in the scope like you did. Put the single banana jack on the yellow lead in the scope and stack the other grounds together away from the scope. This will parent your scope from damage if you hit it or drop it.
Great video overall. Smashed that like button too
Great video! The only thing i would have added to the diagnosis would be to put a borescope in the cylinder to look at the valves, then bumped the key to pressurize the fuel rail and see if the injector was leaking by ... Thanks for sharing.
Your videos are always extremely informative. Thank you for sharing your experience and skill.
Gracias por tomarte el tiempo de compartir tus conocimientos con nosotros
your videos and knowledge are the very best on you tube by far........all the BEST
You are very skilled mechanic bro and you explain the problem well.
6:40 you almost had me 😂, great video as always
Excellent video, Thanks! This is where a transducer in cylinder is really helpful. I would gladly pay for a premium channel with you, you give really clear explanations!
How would you get a transducer IN cylinder? Or is this something that's placed nearby the cylinder? Does it plug into the spark plug hole?
@@jum5238 Through the spark plug hole
This is where an in cylinder pressure test would help. The waveform could likely reveal where the issue is without removing the cylinder head.
Easier would be to just use differential pulse sensors at intake and exhaust and watch the waveform; will tell you exactly which one is misbehaving; clearly a valve not seating right; worn rings are usually very consistent.
@scientist100 Agreed. Totally forgot about that one as I was watching. So for sure. Pulse sensors in intake and exhaust would probably be easier. The trick is always in waveform interpretation. But a dead hole should be real obvious. In a case where a cylinder is not being identified through a DTC. How would you know which one it is? I'm assuming the trigger being used would be an ignition trigger. But from my understanding that trigger will not align with either the intake pull nor either exhaust pulse. Would you be looking at the intake pull right before the trigger?
@@edwinlomonacofoolsend yes; it is important to use the TDC overlay and specify your trigger and firing order but here we already know that it is 8 and whichever looks abnormal would automatically tell us which one is failing. Cylinder identification whether intake or exhaust for a certain cylinder is necessary. Tapping into the exhaust side; you will confirm if it's an exhaust valve but the intake waveform will show both usually as it will back feed pressure if it stays open during compression.
A leak down test would probably be a much easier way to tell
@@DylanL69 I don't know how much you know about oscilloscopes but you can clearly see that the valve sometimes seats correctly as it can get good compression at times and you know what that means... You will get lucky if you get it when it is not fully seating to do a leak down test. Unfortunately; a leak down test may not prove anything. Pulse sensors just needs an intake access; usually a PCV hose and that's all.
great video on diagnosing this issue i totally agree with it . I would be 100% positive that it is a valve seating issue, with a small bore camera you would be able to see inside the cylinder without having to take it apart. just a tip . Good job.
Just had the same issue on a 6.0 Chevy truck. It had very bad intake vacuum leaks on cylinder 4 and 6 causing misfire and lean codes. But repairing it only lead to no more lean codes, but the misfire codes returned.
Intermittent compression loss on cylinder 4 which reduced at higher engine speeds. Sometimes the valves stick in the guides, lifters and cams also fail, but this engine was very clean. Customer also declined further inspection. Hate not knowing the exact cause, but that's our world. :)
This was very helpful, very interesting how that scan tool found the problem
I have also seen these very same symptoms with a plugged/restricted cat converter....
i thought your shop closed down a year ago?? awesome to see you back in it. i fucking love a comeback story
X2 giveaway... I enjoy these videos very much! For everyone you it's clear you spend a lot of time on editing and clearly making them. This is much appreciated by me at least. Keep making them and watch everyone.
i'm a long time subscriber of your show. You've taught me a lot about using a scan tool. i''ve always considered myself a shade tree mechanic but those days are gone. Thanks for sharing your knowledge of the tools we have out today and how to use them. I would like to be in the running for the x tool giveaway. Kee up the good work. And keep putting out the good videos. Thanks.
Another lesson learned today. Thanks for another great video.
I think I heard the unevenness when it was cranking,If I'm not mistaken. And all this time I thought that relative compression meant that compression is relative to the spark. No one ever explained before that it is relative to each cylinder. Thank you for saying that little piece buddy!!!!!
Excellent video as always. Thanks for the tip about cylinder wash and removing injector connector to retest. Thank you.
some diag guys dont know this, some cars will shut off the fuel injector in a multiple missfire situation, bmw is one of them, i have seen guys call a bad injector because the ecu is not triggering the injector to stop cat damage and bore wash/engine damage, id say it is a typical valve not sealing issue.
good call eric.
I was thinking like you with the valve sealing problem. One more thing would be a weak valve spring or a sticking valve. GM had problems with valve guide problems in the past. I have seen a valve seat problem. It took many miles for the problem to occur, but at idle the engine would lope turning on the MIL light and yes, gauge compression and cylinder leak down was good compared to other cylinders. This was before scope testing. The engine was a 1997 Dodge 360 (5.9L) V8. Contacting Chrysler for information, they claimed it was a "metallurgy problem."
The fix. Replace the cylinder heads. The reman heads had the latest and greatest in valve seats. Engine ran great after that.
Love the diagnostics wish i had the schooling growing up. not in our school in 1972.
Thank you
I passed on buying a 2010 Tahoe at a bargain price with multi misfire code do to not having the tools to determine what was happening. Thanks for the oil info. Great job
Bill in Massachusetts
The thing about it is a $200 class from you would be worth it and probably more interesting and informative than a Vo-Tech.
My favorite guy for diagnosis
Great video, very good use of the lab scope.
Ty for explaining this problem issue and that's wats going on with my truck now. It didn't pass smog took it to a mechanic he said it was the #8 misses fire sometimes but it the time I just don't have that $For the extra work which consist of opening the motor and taking a look. Smh.
Use a bore scope B4 rebuild recommended.
Great video!!! Misfires can be tough to diagnose.
Great diagnostic results
The 5.3L is known for AFM lifter issues but #8 is not an AFM lifter. However, they can stick and jam up internally which will cause a lifter tick. If they are not hearing a lifter tick, I doubt that's the issue. I'd be looking at a bent or sticking valve or a broken valve spring on #8.
They might be able to detect a sticking valve by running or even just cranking the engine with the valve cover removed.
my 6.2 has been at a GM dealer for 8 days now with #8 miss. no code. they can't figure out why because they say it's intermittent. already ruled out coil, wire, plug, injector. valve cover off now and nothing obvious. They want to pull the head and check valve and or guide. maybe check push rod BEFORE pulling head? , what else could it be?
Great misfire diag technique , keep it up Man !
I did not know you could actually do a compression test like that, enjoy your videos and lean new things. Win win lol
I love your channel and have been watching your TH-cam your a few months, I followed your steps to do programming Ford ABS module and it works great:) thank u for sharing your expertise. I bought a think pro OBD and they scan great but I can’t use their special functions 😢 it won’t work! I’m disappointed bc I want to able to do more with the relearning…thanks and continue your good work!
I wish I had seen this video 5 months ago to get a chance to win that scan tool. Anyways, great video. I currently have an 08 5.3 with low compression on cyl 2. I did use a mechanical gauge and did not hook up my scope to it. But now with your video I think I will grab my Autel and scope the cylinders, I'm certain I can do it. But not for free. So if my customer says he will pay for this test i'll post my findings here and I will post if he declines the diag. Great video!!!
Man you are great the technology you have is unreal thank you for sharing this
Extoolgiveaway
Thorough , logical diagnosis and great lesson . I believe they swapped coils and injectors to test instead of replacing ALL of them . Saves money there . If there is access , how about putting a small articulating bore scope in # 8 cylinder and possibly examine the valves and seats ? It may be faster than doing a leak down test on that cylinder . #xtoolgiveaway .
mine is also #8. why why why? the MOST difficult to get at.
I have that same Lisle relay test kit. The switched relays are sold separately.
👍 good job, I liked this oscilloscope
Thanks very good job and you describe what you are doing very well .
Oh man cylinder number 8 is a pain to change the spark plug. Very tight and easier to do from underneath in my
Opinion
Thanks for putting out these videos Eric!
Brother you make it look so easy you could easily give a course on running some of this tools.
hey Eric, I can surely use that diagnostic tool.
Thanks for sharing your knowledge
At 10:23, could you use that same set up to test cam timing?
Thank you in advance for your answer.
Great video by the way.
Im having the same issue but on cylinder 4 after lifter replacement. Replaced coil, fuel injector, spark plug, and spark plug wires. Still have the misfire.
Do a compression test on that cylinder and always use gm original parts on the parts you replaced. You can also take off that valve cover and inspect the rocker arm for play etc.
Very very good
I appreciate the videos . . I not sure what is going on with the compressor. I be guessing. Is cylinder 8 one of the cylinder that is used on the active fuel management..I think I would want to pull that valve cover off and watch the rocker arms movement when it's cranking over . . What ever the problem is eventually you will find it
Allways detail trouble shooting, great videos.
Great video, thanks for making it. Im definitely going to and recommend other to follow you. I have 380k miles on my 2007 Yukon. Have misfires on #4 & #6. Recently replaced the oil pump, pickup tube, timing chain, cover, water pump, radiator, all 4 O2 sensor, coil packs, plugs and wires. Radiator blew and it ran hot for a few minutes. Glad i changed the timing chain. The guide on the passenger side was at a failing points. Came apart when i took the guide bolt off.
Question, when using that start relay. Does the key in the ignition need to be turn like in the start position??
Again thanks for the video!!!
Hey buddy. Love your videos. You have a scanner suggestion that’s as the best bag for you buck. Is there one that also does cake key programming you recommend?
What about a leak down test or a camera view?
Thank you. This happened to me. Cracked valve on 8.
Excellent video,
THANKS
Enrique
Bore scope would have come in handy here. I'm thinking burnt valve or valve seat issue.
Good job diagnosing
Hi Eric I've been watching ur vids for a year now and also welcome back you been gone for a while
I changed plugs and TB, all O2 sensors , just doing maintenance . Have p0300 , I need a ghost buster !
Where you ever able to find what the issue was for that truck I’m dealing with the same exact issue with my 2012
Great channel, new subscriber here. Love the advanced diagnosis!
I have learned alot from this video though i don't really know how to use the lap scope.
Very nice work and nice channel ..but i can not understand how lapscope measure the pressure in cylinder by control wire😅
Nice video and diagnosis Eric. I guess with Chevrolet having lifter issues it could be the beginning of a collapsed lifter. Unfortunately, for the customer it’s a lot of labor to disassemble the engine. I guess they will try a mechanic in a bottle. #xtoolgiveaway
Eh, I prob would have chased a partially wiped cam lobe on that one. Might be able to see a difference in rocker rise when cranking over or a little engine noise.
Would you recommend ur scan tool or is there a better version of it?
You mentioned several possible reasons for the mechanical misfire.Would a look in the cylinder with a camera help to eliminate some possibilitys ie valve seat, burnt valve etc. wrench the engine over and look?
Where are you located? Your videos are great but if ppl need a good mechanic how do they find you?
i thank you are right on
You seem like an amazing mechanic, I understand you are located in Houston but I would love if you could send me the location of your shop or the name, so I can swing by for you to look at my car which is having problems, thank you.
Very clear explanation
Great video great explanation thank you very helpful 👍🏼
PLEASE READ! I had the same issue on a 2011 5.3l it was on Cylinder 6. I recommended removal of the Valve Cover for inspection and stated it may be possible lifter. Customer took the truck, Apparently, our shop quote was too high if it needed all that. Customer took it to the shop next door. Their Diagnostic tech found a bent valve for that cylinder. So this is where it gets interesting.... They kept the truck for a whole month. And i was eager to know what was the issue. So turns out, they did the whole head job on both banks, replaced valves and still was misfiring for same cylinder after they had it all together. They did their checks and took it all apart again. It was a bad exhaust lifter for that cylinder and had rounded out the cam lobe. Made sense since sometimes it would seal and sometimes it would lose compression. Their Jr. Tech is friends with one of ours and he confirmed it. Dang.
any updates? this is a very common problem on cylinder 8 on the 5.3 , but n one wants to take the engine apart.
Can you give any advice on a labscope I can purchase for a beginner please?
Hey brother where do you work out from
I’m located in l.a Cali need a good mechanic 😁
I’m having this issue
I have a 13' in my shop, one of those friend jobs. Only misfires on decel on cyl1. Weird
Bad lifters...cylinder 1 is afm lifters
Was there a check engine light on
I have a P0300 code problem too 2014 Chevy Silverado 1500 lt 5.3
I had a misfire on 8 switched coil and misfire moved to Cylinder 5, replaced that and it moved to 4. What may be going on? I pulled wires one by one to check spark.
Dangit, I was hoping for a smoking gun!!! I have a '99 Silverado, 5.3, 144k miles. So no AFM or VVT. I don't have a scope available although I can use one. So here is my story. Cylinder #3 miss at idle. Previous owner replaced plug wire and intake gaskets. I tested compression and it was 125psi on #3 and 145psi on #1 and #5. I thought possible cylinder wash so I ran it for a bit with the injector unplugged and #3 came up to 145psi. I replaced the coil with a good used coil, it has strong spark, swapped spark plugs between cyl. #1 and #3, swapped injectors between #1 and #3 but before that I checked for injector pulse which it had. I smoke tested the intake and found no leaks anywhere. There is a very faint bit of valvetrain noise but it doesn't sound like a problem. No lifters rattle on start up. I even went as far at to exchange the injector wires between cylinders #1 and #3. I know this makes the injector timing horrible but I thought possibly if the miss followed the wiring it could be an injector wire that was weak enough to fail under load but not weak enough to fail with a noid light. But the miss stayed at cylinder #3. I haven't pulled the valve cover yet. I'm hoping for possibly a bent push rod or failed rocker arm although as I stated, not real valvetrain noise. If that checks out what would you recommend? I've worked on these engines since they were new at the dealership and thought I had seen everything. But this one has me scratching my head.
How would a camshaft cause intermittent low compression?
@Eric, what’s your thoughts on the XTool D8, for $549.00?
I have the exact same symptoms on my 2004 Silverado 6.0 liter
The only difference is if the truck is warmed up, after 5 minutes or so driving, all random misfiring disappears.
Could this possibly be expansion of a valve seed or some other component that results in better sealing which eliminates misfire?
Or perhaps going from closed loop to open loop? Expecting a pinpoint diagnosis. But what would cause the symptoms to disappear after running the truck for about 5 minutes? I live in Florida so there's no extreme cold temperatures
Also, truck only has only 98000 miles
Daaaaam bro throwing some serious shade with that 199.00😅
What are symptoms of one cylinder with not enough compression? Would cel be on
Cel will be on because it's misfiring
Why not check compression with mechanical gauge in spark plug position to confirm you have low compression?
Because he is using current as a means of capturing compression. A higher peak = more current= more compression
I’m having a problem with my ram 2012 1500 I live in Arizona randomly shuts off how can I get a hold of you took it to multiple shops has new tranny new sparks plugs coils and throttle body cleaning please help !!
Dude your channel is gold ❤
If you marked cylinder 1 and counted like you show wouldn't it be cylinder 2? Or have I missed something
Very cool video and very good information 😀