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This is a 4.3 l V6 from a 15 Silverado. Little guy was littered with misfires and had one dead cylinder. Based on the one fuel soaked piston and spark plug, carbon build up, compression loss, I had to dig deep to find the problems. And nope...it didn't have a leaking head gasket.

47 thoughts on “Customer states engine is rough. confirm a misfire diagnosis with pb blaster? yup!”
  1. Avataaar/Circle Created with python_avatars Johnny Sechrist says:

    Looks like Seafoam should have been used a few times a month.

  2. Avataaar/Circle Created with python_avatars TakeDeadAim says:

    That engine spent a lot of time at low/idle speed.

  3. Avataaar/Circle Created with python_avatars Ray T says:

    GREAT DIAG!!

  4. Avataaar/Circle Created with python_avatars Edward Jenner says:

    Seafoam treatment every 6 months or every other oil change really does help with direct-inject engines.

  5. Avataaar/Circle Created with python_avatars Wet Hook Fever says:

    Treat it with Zmax it will be okay.

  6. Avataaar/Circle Created with python_avatars BigBadWolfe says:

    This is why I bought a Ram with a 6.4 hemi and when it gets sluggish I just floor the thing and problem solved. And I run 93 octane. It is a little expensive changing 16 spark plugs though.

  7. Avataaar/Circle Created with python_avatars Jeff Cuevas says:

    Caused by crappy gas with heavy carbon?

  8. Avataaar/Circle Created with python_avatars Ben Rodeheaver says:

    If that owner would have sprung for some fuel system cleaner once in awhile the carbon wouldn't have been a big issue.

  9. Avataaar/Circle Created with python_avatars Jason Campbell says:

    Take a spray bottle of water spray it down your intake while holding the engine at 2500 rpm. Do this every oil change. It will steam clean everything. It won't stop carbon build up but it helps. Seafoam and Barryman work also. Better than letting it get this bad.

  10. Avataaar/Circle Created with python_avatars clutch in says:

    Gasoline works better

  11. Avataaar/Circle Created with python_avatars Jimmy, Making it work says:

    Induction services(done properly) are more important than ever, as are oil changes. Good quality fuel or carbon reducing additives will also make a huge difference.
    Direct injection isn’t causing these problems.

  12. Avataaar/Circle Created with python_avatars Ozman Ozgood says:

    looks like a LS/LT with two cylinders cut off like the old sbc days

  13. Avataaar/Circle Created with python_avatars shakey says:

    Bought a used VW Tiguan. It had direct injection too. It also had horrible top end oil leaks. Cost to do both was more than the car was worth. Owned it less than 3 months.

  14. Avataaar/Circle Created with python_avatars Mark Everett says:

    Why do those combustion chambers look so bad? Is it fuel/fuel quality? Fuel additives?

  15. Avataaar/Circle Created with python_avatars Ken Bober says:

    This is quality video to show the customer to prove you are not bullshitting about the repair

  16. Avataaar/Circle Created with python_avatars Caleb Taylor says:

    Real problem is that it’s missing 2 Cylinders

  17. Avataaar/Circle Created with python_avatars jkwfo says:

    because its a chevy

  18. Avataaar/Circle Created with python_avatars joesbarbecue1 says:

    There's just nothing like taking your car in for a "little" misfire diagnosis, then coming back a few hours later to find the engine disassembled all over the shop.🤣

  19. Avataaar/Circle Created with python_avatars 2to4 says:

    I've always just used gas to check for leaks. Also pour oil on the pistons to see how fast it leaks past the rings. Not sure on the year but alot of the vortec engines have a issue with the pcv in the valve cover becoming clogged which will cause this build up.

  20. Avataaar/Circle Created with python_avatars Bill says:

    Since when did this engine get DI? I thought it was the last living relative of the 350 (port injection most practical means of injection possible other than TBI).

  21. Avataaar/Circle Created with python_avatars Bige4u says:

    A v6 version of the LS engine. smh

  22. Avataaar/Circle Created with python_avatars David Parsons says:

    That's the coolest test I've ever seen. Thanks

  23. Avataaar/Circle Created with python_avatars Anthony King says:

    Let's guess direct injection engine. ??? Carbon build up !!

  24. Avataaar/Circle Created with python_avatars tjsbbi says:

    Looks like it had an informal EGR system.

  25. Avataaar/Circle Created with python_avatars Zach G says:

    No leak down tester?

  26. Avataaar/Circle Created with python_avatars Andrew Berndt says:

    You did compression test but did you do a leak down test, could've figured this out without pulling the heads

  27. Avataaar/Circle Created with python_avatars 1911 Smoking Gun says:

    GM motors suck

  28. Avataaar/Circle Created with python_avatars Todd Perry says:

    Customers first problem was buying a GM product!

  29. Avataaar/Circle Created with python_avatars Tony Turk says:

    You know how to take it all apart. Valve job is so easy compared to what you did

  30. Avataaar/Circle Created with python_avatars Charles in charge. says:

    Cool move.📡👽🇺🇸 MOTOR!!!

  31. Avataaar/Circle Created with python_avatars Clutchkickit says:

    Just buy a honda or a toyota. My shit still drives with 50,000 kms on the oil

  32. Avataaar/Circle Created with python_avatars Clutchkickit says:

    Cant fix a defective motor from factory. Most well scrap it

  33. Avataaar/Circle Created with python_avatars Julien-Pier Belanger says:

    Double dog damn! And I thought my engine had a lot of carbon buildup!

  34. Avataaar/Circle Created with python_avatars Kyle Martini says:

    Being the "owner" of this truck, I'm the fleet maintenance foreman for the place that is the big green square on the side of the truck, I can tell you that the gasoline that is run in this truck is the cheapest you can buy. Bean counters making all the decisions. We fight carbon issues with most of the fleet. The direct injection just exacerbates the issue for sure. We are a man down in the shop and well behind in PM's so we had to pawn this one off on you guys. Kinda glad we did. Funny to find this video while surfing YouTube.

  35. Avataaar/Circle Created with python_avatars James George says:

    LV3 engine ?

  36. Avataaar/Circle Created with python_avatars R Fortier says:

    Problem is. It’s missing 2 cylinders.

  37. Avataaar/Circle Created with python_avatars livesteamfan1 says:

    And yet another good reason why I daily an old carbureted car.

  38. Avataaar/Circle Created with python_avatars Gregred78 says:

    Using a little gasoline is a bit of an easier way of doing that, but I guess if you don't have any on hand that way works too.

  39. Avataaar/Circle Created with python_avatars Edward Myers says:

    Even that V6 still uses technology from the 1960s sheesh, when will GM innovate. Still using push rods?

  40. Avataaar/Circle Created with python_avatars narwhal says:

    Might as well check the cam

  41. Avataaar/Circle Created with python_avatars Phillip The Third says:

    What engine is this? And can I expect to find this this problem on many of this same engine?

  42. Avataaar/Circle Created with python_avatars Miles Whittington says:

    It's because it's a chevy…

  43. Avataaar/Circle Created with python_avatars CodyDoesIt says:

    One hell of a leak down test….

  44. Avataaar/Circle Created with python_avatars Kcducttaper1 says:

    What was the mileage? Did it actually have misfire codes on all of those cylinders? A leaky valve definitely isn't good, but doesn't automatically cause a misfire either.