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This is part two of a teardown on a 2020 GMC Sierra 6.2l It suffered some internal damage.

49 thoughts on “Customer states engine knocking! damaged valvetrain. afm dod part 2”
  1. Avataaar/Circle Created with python_avatars Mission Hills says:

    Still in shock with the ease the manifold bolts came out, it was like watching the impossible become possible (canada eh)

  2. Avataaar/Circle Created with python_avatars randy beard says:

    In the last Days, the More Educated people become, the More Fools they become, someone said this and I think it applies to Vehicle Engineers…

  3. Avataaar/Circle Created with python_avatars DAVID KABARA says:

    Not seeing much oil at the top end?

  4. Avataaar/Circle Created with python_avatars Cochip __ says:

    This series gives me the nervous shakes and a twitch! This crappy design ended up eating a cam journal when the AFM lifter spun in the plastic lifter bucket. needless to say the DOD system got deleted and back to standard lifters.

  5. Avataaar/Circle Created with python_avatars alan may says:

    With 17,000 on the clock. Return it back to the dealer

  6. Avataaar/Circle Created with python_avatars Steve Alan says:

    Where on Earth would I be able to obtain that 1/4 sized 3/8 drive ratchet? Glad that injector rail came out as easy as it did! Had one come through my shop a while back and we ended up destroying the rail. Tried lady fingers, pry bars, multiple penetrating lubes, using compression to try to assist. Our local GM dealer said they normally end up destroying the rails on vehicles with higher miles because over time the tips of the injectors balloon and get stuck in the bore. Took me and one other mechanic both on a pry bar each before it gave up. Even tried the tool GM sells specifically for removing these rails! Great content man!

  7. Avataaar/Circle Created with python_avatars Jos de Koning says:

    This is a 2020 car. What's the milage? What caused the problems?

  8. Avataaar/Circle Created with python_avatars Tolbat says:

    Did GM pay for this?

  9. Avataaar/Circle Created with python_avatars Sam Stevenson says:

    You guys up north are going to hate this. Yes… yes I did.

  10. Avataaar/Circle Created with python_avatars Anthony Young says:

    Iv worked on heavy equipment for 20 years and iv always used harbor freight tools and never had any problems with them thay have served me very well.

  11. Avataaar/Circle Created with python_avatars trapps75 says:

    Take home message don't buy a gmc period already major problems unreliable vehicles

  12. Avataaar/Circle Created with python_avatars noah holt says:

    What’s your opinion on products like range programmer

  13. Avataaar/Circle Created with python_avatars Rob M says:

    The dreaded exhaust manifold bolts lol I'm from NY yes they suck and usually break although they would probably still be ok on a 2020 vehicle though .

  14. Avataaar/Circle Created with python_avatars Av8tore71 says:

    Well the vehicle IS a 2020 so us up here in the RUST BELT have a lot of luck with manifold bold in newer vehicles! It's the ones that have seen at least 5 winters before we start breaking the bolts not a 2 year old truck

  15. Avataaar/Circle Created with python_avatars william horvath says:

    This is why I drive Japanese vehicles!!!!!!

  16. Avataaar/Circle Created with python_avatars D R says:

    In your first video of this vehicle you stated it had 17k miles. Why then is this vehicle not being repaired under GM warranty at a GM dealer? That is unless your repair shop is an "authorized GM dealer"??? If not then what is this going to cost the owner?

  17. Avataaar/Circle Created with python_avatars Craig Smith says:

    I'm just sat here racking my brains and you know I can't think of the European made car that's had a push rods and lifters that's been made in the last 40 years!

  18. Avataaar/Circle Created with python_avatars Steve Cea says:

    This is why my Chevy Tahoe I deactivated the cylinder deactivation for fuel economy it runs on V8 power all the time and I'm going to keep it that way forever

  19. Avataaar/Circle Created with python_avatars Cyborg Bill says:

    When a tool or part gets drop from engine compartment area, if it makes it to the ground it will be located in the exact center of the car's front foot print.

  20. Avataaar/Circle Created with python_avatars Michael says:

    I bent all my pushrods like you said and I didn't get anywhere near 700 extra hprs. Maybe 100 at the most.

  21. Avataaar/Circle Created with python_avatars Jon Clark says:

    Fine job sir.

  22. Avataaar/Circle Created with python_avatars Hyde Whyte says:

    You guys up north are gonna hate this …. not broken, not broken, not broken … That's unpossible!!!!!!

  23. Avataaar/Circle Created with python_avatars Jess Ackerman says:

    Look at intake manifold before you buy one!

  24. Avataaar/Circle Created with python_avatars Jeremiah Schaefer says:

    Although there are special tool pullers to remove the injector rails… The way Ray used tHE J-WoodBlock and J-PryBar is the preferred and acceptable method for dislodging said fuel rail. Before the dust shields were added the only way was to soak with Penetrator Oil and wait… Then repeat… And wait.

  25. Avataaar/Circle Created with python_avatars Thomas Doyle says:

    Hi there. I'm no mechanic but I do love watching your videos. I have a question for you on this DOD/AFM engine problem. I have an Avalanche that drives like a dream but it is getting up there in miles – (over 200k). I plan to keep this truck until the wheels fall off because the inside is perfect, no rips in leather, has drop down DVD system for kids or passengers in the back, etc. It does have some rust on it but that doesn't bother me any. Do you think it's too late in the game to do the full DOD/AFM delete? I couldn't do it myself so I would have to take it to a garage to have it done. Thanks in advance for your answer! Tom.

  26. Avataaar/Circle Created with python_avatars Selv says:

    This guy has a Kyle Dunnigan sound sometimes.

  27. Avataaar/Circle Created with python_avatars Greg Gates says:

    Hahaha "you guys up north are going to hate this".

  28. Avataaar/Circle Created with python_avatars Jerry Costilla says:

    Just wondering how much does a job like that cost?? And how do you know if its worth fixing?

  29. Avataaar/Circle Created with python_avatars WD Preston says:

    Hell no.

  30. Avataaar/Circle Created with python_avatars Andrew White says:

    Pushrods.. how quaint

  31. Avataaar/Circle Created with python_avatars DashCamEyes says:

    No wonder why so many new truck in dealer lot at Chevrolet

  32. Avataaar/Circle Created with python_avatars Jay Wolf Elite Ammunition says:

    One of these days chevy will figure out how to make a pushrod engine

  33. Avataaar/Circle Created with python_avatars Gary Holt says:

    I don't understand why did people say Harbor freight tools is bad tools I had never had a problem with their tools

  34. Avataaar/Circle Created with python_avatars Hola! Russel Brown says:

    Stupid technology for the sake of saving $2. worth of fuel it trashed a $5000 engine. Wow

  35. Avataaar/Circle Created with python_avatars David Bowsher says:

    What would cause this?

  36. Avataaar/Circle Created with python_avatars m schiffel says:

    You'd think that by now GM would know how to make lifters properly. WTF's wrong with them?

  37. Avataaar/Circle Created with python_avatars Joshua Raffensperger says:

    Tell your customer to purchase a Range Technologies OBD AFM disabler module.

  38. Avataaar/Circle Created with python_avatars Darin Brockman says:

    I have been watching your videos (which are awesome by the way) and wondering to myself "is this guy ever going to use an adjustable pry bar!!" I feel much better now! 🙂

  39. Avataaar/Circle Created with python_avatars Chris Padilla says:

    That has to be the cleanest used engine I’ve seen.

  40. Avataaar/Circle Created with python_avatars Henry Cole says:

    look at the engine components of an early 2000s vehicle, and this one. Everything is much thinner and low quality. Yet, cost many thousands more. Same on GMC

  41. Avataaar/Circle Created with python_avatars Henry Cole says:

    lol active fuel management lifter? Total junk.

  42. Avataaar/Circle Created with python_avatars Matt says:

    Would this be warranty work? If so gm picks up the tab? If it's not warranty work what did it set the guy back?

  43. Avataaar/Circle Created with python_avatars Wayne Jones says:

    I’m a little confused here, I don’t think we see push rods any more in the UK, are you removing the head to replace a collapsed hydraulic cam follower/lifter?
    I was thinking you could just replace the push rod, but thinking about it the rockers weren’t adjustable.
    Good job Ray.

  44. Avataaar/Circle Created with python_avatars Wayne Jones says:

    Oh, I thought this was going to be an easy fix in part one, how wrong was I.

  45. Avataaar/Circle Created with python_avatars joe kirk says:

    You can leave the fuel rail in the head to save time

  46. Avataaar/Circle Created with python_avatars mike bougher says:

    I prefer the swivel head ratchet 1/4 body with 3/8 head.

  47. Avataaar/Circle Created with python_avatars Sonny Davis says:

    Reverse click…

  48. Avataaar/Circle Created with python_avatars Sman7290 says:

    What is this voodoo that you have done with the exhaust manifold bolts? There must be no less than 3 that break!

  49. Avataaar/Circle Created with python_avatars 85lebaront2 says:

    I would be more impressed to see you get all 8 exhaust manifold bolts (either side) out of a 460 Ford EFI engine without breaking any off in the head.

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