6.2 Knocking sound in my 08 Yukon Denali, 140k miles
#1
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6.2 Knocking sound in my 08 Yukon Denali, 140k miles
I'm getting a knocking like sound when the engine is cold but I can't pinpoint it. It doesn't sound like what you hear in typical youtube vids. Mine sounds more diesel engine like (very lightly like!!! I'd **** my pants if it sounded like a full on Cummins). I'm having a hell of time getting it recorded. No CEL, no loss of power, engine pulls just fine.
Rev in neutral [cold]: NO Knock
1-2-3 gear shift accelerating [cold]: Knock, but not when gears are shifting.
1-2-3 gear shift accelerating [hot]: Sounds normal!
Any ideas? Not engine but something in the drivetrain?
Rev in neutral [cold]: NO Knock
1-2-3 gear shift accelerating [cold]: Knock, but not when gears are shifting.
1-2-3 gear shift accelerating [hot]: Sounds normal!
Any ideas? Not engine but something in the drivetrain?
#2
TECH Fanatic
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lol, kinda like this I guess
2012 Yukon XL Denali 6.2 cold start noise, camshaft & lifters repl - 1999-2006 & 2007-2013 Chevrolet Silverado & GMC Sierra 1500 - GM-Trucks.com
2012 Yukon XL Denali 6.2 cold start noise, camshaft & lifters repl - 1999-2006 & 2007-2013 Chevrolet Silverado & GMC Sierra 1500 - GM-Trucks.com
My L9H non-AFM Sierra slaps pretty good when it's cold. It's bad enough that my 17 year-old daughter noticed in when she drove away one morning without letting it warm up. She calls me up and says, "I think something's wrong with the truck. It sounds like a diesel." I then proceeded to explain piston slap and tolerances.
It has 70k miles, does not use one drop of oil between changes, and quiets down after a few minutes. Remote start is great because we just start it five minutes (or more) before we plan to leave. I'm not worried about it. That truck and engine will probably outlive me.
It has 70k miles, does not use one drop of oil between changes, and quiets down after a few minutes. Remote start is great because we just start it five minutes (or more) before we plan to leave. I'm not worried about it. That truck and engine will probably outlive me.
#3
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Oil pressure cold is 40psi at idle, 25+psi warm FWIW. Oil change had no glitter.
Sorry for the string of replies, just posting as I see and remember things.
Sorry for the string of replies, just posting as I see and remember things.
#6
TECH Fanatic
Thread Starter
The 6.2 seems reaaaally prone to piston slap. It ain't the end of the world. I'll just remote start or take it easy for the first 5 min or so.
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