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Dull knocking noise 2014 5.3

paulv

By paulv
in Engines & Drivetrain

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paulv Enthusiast

paulv

Posted
Posted

Hey guys,,,,

 

I hear a dull knocking noise under light acceleration that's more noticeable when the motor is cold than hot, but you can still hear it some when hot. It kinda sounds like a wrist pin would. The truck only has 800 miles on it and im not feeling great about this purchase. I am not certain if it is in fact a wrist pin noise and have not taken it in for service yet. Does anybody else hear knocking when under a light accel?

 

Thanks

Spurshot Senior Enthusiast

Spurshot

Posted
Posted

Nothing from my 5.3 with 4000 miles so far. I babied it for the first 700-800 miles and drove it normally thereafter with short bursts of full throttle to pass.

 

If your noise is only under acceleration, I'd try first finding some high octane gasoline just to get that out of the way. I know Justin of BlackBear tuning can detect knocking when plugged in during driving for a custom tune.

 

The most common LS engine noise is lifters.

 

Good luck.

glcbn Enthusiast

glcbn

Posted
Posted

I'm thinking if you only heard it when cold,that may indicate a wrist pin. Are these new ones floaters? The older 5.7 Vortec was notorious for this when cold.

fondupot Senior Enthusiast

fondupot

Posted
Posted

Are you sure you're not just hearing the ticking from the Direct injection injectors? They will tick.

paulv Enthusiast

paulv

Posted
  • Author
Posted

I don't think its injector noise, its sounds like a dull knocking noise. But it quiets down when hot. I don't know what to think. It also has this whiny noise at the same time.. and noooo its not me whining...lol

VMaxtastic Enthusiast

VMaxtastic

Posted
Posted

My 2013 6.2 did that. Eventually, at 40,000 km, i traded it in. It got so bad it sounded like the motor was going to blow up, and 3 dealers said it was fine. Completely different motor, but I think I know the sound you speak of. I saw reports of people getting lifters changed out. I never convinced them to open it up.

paulv Enthusiast

paulv

Posted
  • Author
Posted

OK,,,,so I changed my engine oil with Mobil One 0w 20 as recommended and fueled up with 93 octane at BP.....and drove 50 miles last night . This morning I had the same noise. So should I wait or take her in ? She has 850 ish for mileage.

glcbn Enthusiast

glcbn

Posted
Posted

I wouldn't wait. I doubt it's going to suddenly fix itself.

Full Lock Enthusiast

Full Lock

Posted
Posted

I'm thinking if you only heard it when cold,that may indicate a wrist pin. Are these new ones floaters? The older 5.7 Vortec was notorious for this when cold.

Most of the older LS engines had piston slap. My old 4.8L did it really bad on start up and when it was cold and it lasted a good 40k after I first noticed it and it's still goin to this day.

 

With all that said, I would def have GM check it out just to be sure

waumo1 Enthusiast

waumo1

Posted
Posted

I don't think its injector noise, its sounds like a dull knocking noise. But it quiets down when hot. I don't know what to think. It also has this whiny noise at the same time.. and noooo its not me whining...lol

Do the new GM engines have oil squirters for cooling the pistons?

 

I know our SRT 6.1L engines have oil squirters and the "whiny" noise I hear from time to time at idle is the squirters. It worried me at first because I never owned an engine before that made that noise.

glcbn Enthusiast

glcbn

Posted
Posted

Do the new GM engines have oil squirters for cooling the pistons?

 

I know our SRT 6.1L engines have oil squirters and the "whiny" noise I hear from time to time at idle is the squirters. It worried me at first because I never owned an engine before that made that noise.

 

Fairly certain they do.

paulv Enthusiast

paulv

Posted
  • Author
Posted

OK,,here is an update,well....... not really.

 

I took it in to the dealer,( where my wife works.) The service manager said he would look into it. They apparently listened and reported back that they don't hear the noise.... As I was afraid of . So I am left with take it somewhere else, or let the problem develop more. The dealer gave me a really good deal on the truck and for that I am grateful. Coupled with my wife works there, I don't know if I should push this at her work or take the service elsewhere. I don't want to cause problems where my wife works so I am in limbo until I decide what the right move is.

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