CHEVY SILVERADO MISFIRE INTERMITTENT COMPRESSION

In today's video we take a look at a 2013 Chevrolet Silverado 1500 with a V8 5.3l engine. The customers complaint is that there is a misfire on cylinder number 8. The repair shop replaced spark plugs, wires and even swapped ignition coils and injectors, but the misfire continued on cylinder number 8. Convinced that the engine had a mechanical problem they asked me to take a look. What I found was something very interesting. Cylinder number 8 at times had good compression and at times had low compression. Could it be a bad lifter, camshaft, valve spring or a valve seat?
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Disclaimer:
Due to factors beyond the control of Advanced Level Auto, I cannot guarantee against improper use or unauthorized modifications of this information. Advanced Level Auto assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. Advanced Level Auto recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of Advanced Level Auto, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Advanced Level Auto.

[@fixitjerry]

GM mechanic here, see this every day, I got my money on lifters and possible cam damage. Do them every day! Great video

[@jamespatterson9446]

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.

[@edwinlomonaco6754]

This is where an in cylinder pressure test would help. The waveform could likely reveal where the issue is without removing the cylinder head.

[@scientist100]

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.

[@edwinlomonaco6754]

@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?

[@scientist100]

@@edwinlomonaco6754 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]

A leak down test would probably be a much easier way to tell

[@scientist100]

@@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.

[@ThunderbirdRocket]

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 !

[@davidnanze8697]

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.

[@dmworks4858]

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

[@ronniegarland8621]

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 👍👍👍

[@thejflores1219]

6:40 you almost had me 😂, great video as always

[@jameshappl608]

Excellent diagnosis, I like the way you systematically break down each test that you are going to do

[@advancedleveldiagnostics]

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!

[@jum5238]

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?

[@advancedleveldiagnostics]

@@jum5238 Through the spark plug hole

[@mikechiodetti4482]

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.

[@john7017]

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.

[@TStockton4]

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.

[@curtismorrison8171]

Your videos are always extremely informative. Thank you for sharing your experience and skill.

[@gman3747]

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.

[@JimmyMakingitwork]

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. :)

[@KRTube75]

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.

[@chrismechanic2000]

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.

[@mtberguy]

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

[@trishexploring1508]

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!!

[@almamadrigal8813]

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.

[@billsmith2212]

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 .

[@carlodonnell146]

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!!!!!

[@rikin6912]

I have also seen these very same symptoms with a plugged/restricted cat converter....

[@MrBill-xs6bx]

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

[@josepena2536]

Gracias por tomarte el tiempo de compartir tus conocimientos con nosotros

[@samd410]

your videos and knowledge are the very best on you tube by far........all the BEST

[@fredsalter1915]

Another great vid, Eric! Please keep them coming! God Bless!!!!

[@ADVANCEDLEVELAUTO]

Thanks! Will do!

[@armusc757]

Use a bore scope B4 rebuild recommended.

[@andrewvillanueva3722]

You are very skilled mechanic bro and you explain the problem well.

[@MrBeefsnorkel]

i thought your shop closed down a year ago?? awesome to see you back in it. i fucking love a comeback story

[@no-worries-its-okay]

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.

[@2011joser]

Another lesson learned today. Thanks for another great video.

[@tomlobato3726]

Love the diagnostics wish i had the schooling growing up. not in our school in 1972.

[@chi-towntrucker7207]

This was very helpful, very interesting how that scan tool found the problem

[@TurnThemWheels]

Oh man cylinder number 8 is a pain to change the spark plug. Very tight and easier to do from underneath in my Opinion

[@tony6235]

I did not know you could actually do a compression test like that, enjoy your videos and lean new things. Win win lol

[@stevenlatham4397]

The thing about it is a $200 class from you would be worth it and probably more interesting and informative than a Vo-Tech.

[@sammoore5011]

Excellent video as always. Thanks for the tip about cylinder wash and removing injector connector to retest. Thank you.

[@donaldcarter7939]

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.

[@michaelsingh2699]

Great video, very good use of the lab scope.

[@rodgeremery5691]

Man you are great the technology you have is unreal thank you for sharing this

[@rodgeremery5691]

Extoolgiveaway

[@Clamlifenc]

I love your channel and have been watching your KZbin 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!

[@marcosmateo8439]

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.

[@Alexxela19202]

Brother you make it look so easy you could easily give a course on running some of this tools.

[@duffysautoservice9015]

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!!!

[@autodiagnostics6081]

My favorite guy for diagnosis

[@jimkillen1065]

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

[@patdavis2540]

Thank you. This happened to me. Cracked valve on 8.

[@1967davethewave]

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.

[@user-vs2no9dk3k]

I have learned alot from this video though i don't really know how to use the lap scope.

[@zackarymcclain164]

Valve sealing or intermittent lifter operation because of a bad vlom. More than likely the valve itself would be the issue. Personally I prefer to do in cylinder as well as intake and exhaust pulse captures when chasing a mechanical integrity problem.

[@orangecrush50]

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.

[@kdmq]

Valve sealing makes sense because the valve will either seal or it won't on each cycle of the engine. So that would explain an intermittent compression issue like this. If it was a VVT issue the whole bank would be acting up.

[@KevinMiller-lh9ur]

Great video!!! Misfires can be tough to diagnose.

[@geraldmartin3625]

I have that same Lisle relay test kit. The switched relays are sold separately.

[@jackiemay9471]

a pressure transducer like the ones ivan PHAD uses and sells in cylinder in exhaust in crank case and inlet manifold that would give the full picture without disassembly wiggly lines is the way its going for these diagnostic faults

[@kimtaylor5125]

Thanks very good job and you describe what you are doing very well .

[@gilbertomoran7420]

Great misfire diag technique , keep it up Man !

[@cullenmiller8170]

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

[@boobalew]

I bought that model X-Tool and it’s awesome. I had a Snap On SOLUS and it would have cost me a Thousand Dollars to update.

[@rodvan-zeller6360]

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.

[@mph5896]

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.

[@joegroome5561]

Great diagnostic results

[@howards7882]

hey Eric, I can surely use that diagnostic tool.

[@abdoalbasha4368]

Very nice work and nice channel ..but i can not understand how lapscope measure the pressure in cylinder by control wire😅

[@Jordensquad]

Hi Eric I've been watching ur vids for a year now and also welcome back you been gone for a while

[@luismedrano1352]

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.

[@user-jx7iv7di1l]

I have a P0300 code problem too 2014 Chevy Silverado 1500 lt 5.3

[@rodpalm6398]

Bore scope would have come in handy here. I'm thinking burnt valve or valve seat issue.

[@bartscave]

Thanks for putting out these videos Eric!

[@justinsmith1520]

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.

[@tzvi-goldenberg]

I think you are wrong. In a relative compression test in this way, the lower peak is the compression peak, unlike a current clamp test.

[@ADVANCEDLEVELAUTO]

That is why I invert the signal. Thanks for watching!

[@shanestrains2849]

I have a 13' in my shop, one of those friend jobs. Only misfires on decel on cyl1. Weird

[@2nickles647]

Bad lifters...cylinder 1 is afm lifters

[@ernestochavez89]

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?

[@arazaliguliyev]

👍 good job, I liked this oscilloscope

[@miguelmendez2495]

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 !!

[@HouseCallAutoRepair]

Looks like your Vantage, was at the disadvantage at some point.....ouch

[@Cvisland105]

Where you ever able to find what the issue was for that truck I’m dealing with the same exact issue with my 2012

[@mikerodr]

Thanks for sharing your knowledge

[@dieselfixr]

When you were talking about your premium channel. It sounded legit 😅

[@PapasHobbyGarage]

I just got a 2010 5.3 when first up it has 160psi compression as warms up it loses compression

[@als82]

Allways detail trouble shooting, great videos.

[@rpo69z28]

XTOOL GIVE AWAY, that is an excellent tutorial video Eric, thank you for sharing, can you use the Autel MK906BT with a pico scope to do a relative compression test?

[@sonofmontezuma3732]

Daaaaam bro throwing some serious shade with that 199.00😅

[@camerongilmour77]

Great channel, new subscriber here. Love the advanced diagnosis!

[@user-ju8rr9rf1o]

any updates? this is a very common problem on cylinder 8 on the 5.3 , but n one wants to take the engine apart.

[@bobbrown3317]

worth having the tool just for an easily done compression test

[@JR-km9zg]

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?

[@kathiduran9583]

Where are you located? Your videos are great but if ppl need a good mechanic how do they find you?

[@wholenation5071]

Good Work A.L.A..

[@jsbsmdauto]

What about a leak down test or a camera view?

[@alanmorrison3598]

How would a camshaft cause intermittent low compression?

[@ricklarson9524]

Good job diagnosing

[@josegonzales4297]

Great video great explanation thank you very helpful 👍🏼

[@jamespatterson9446]

If you marked cylinder 1 and counted like you show wouldn't it be cylinder 2? Or have I missed something

[@USBCablez]

I want one of your shirts Wish you was closer to me I would have you look at my dodge caliber

[@1SLWMPR]

You ever play with the idea of teaching how to diagnose. #XtoolGiveaway Watching from So Cal.

[@colbylaing5187]

Why not check compression with mechanical gauge in spark plug position to confirm you have low compression?

[@2nickles647]

Because he is using current as a means of capturing compression. A higher peak = more current= more compression

[@dmore2262]

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

[@dmore2262]

Also, truck only has only 98000 miles

[@charlesstevens5085]

#XToolgiveaway great video, why not using wet compression test to isolate valve leak or cylinder compression rings.