Piston Slap
06-03-2005 | 12:25 PM
#11
Originally Posted by budhayes3
That could be. It happens at all RPM's, you hear it more when as you rev it, and shorting out cylinders doesn't make a difference in the noise. I was also thinking rocker arm or lifter (hopefully not lifter), and the rockers all looked OK when I did the cam. Thanks, it does help to know 
Maybe I should run it with no oil in it to see if the noise goes away!
J/K...(then I'd definitely have an excuse to go 6.0)
Maybe I should run it with no oil in it to see if the noise goes away!
J/K...(then I'd definitely have an excuse to go 6.0)Philip S.
06-03-2005 | 12:47 PM
#12
Originally Posted by BigBlockChev572
Welll, I was thinking it could be the oil, but I only put 5 1/2 qts. in it last oil change and it's reading fine on the stick. The noise doesn't sound related to valvetrain to me. This evening I'll do some listening as I rev it slowly. I can't remember if it makes that noise above idle.
Philip S.
Philip S.
06-03-2005 | 08:04 PM
#14
TECH Apprentice
Joined: Mar 2004
Posts: 361
Likes: 0
From: Ontario, Canada
My 5.3L started slapping at 50000kms, it would last for 30 secs in the winter. Now my 03 6.0l started doing it little at 20000kms, it only lasts for 10 secs. The knocking doesn't bug me as much as the belt squeak I have on a cold start.
A guy at work has a 1998 with a 4.3L that sounds like a diesel in the winter, but it does go away after a min or two.
A guy at work has a 1998 with a 4.3L that sounds like a diesel in the winter, but it does go away after a min or two.
06-03-2005 | 08:06 PM
#15
Originally Posted by budhayes3
Thanks man...
Philip S.
06-03-2005 | 09:37 PM
#16
Originally Posted by BigBlockChev572
I'm pretty sure the engine makes the noise when revved, It's hard to hear it, but I think I slightly can. But it's definitely louder when ideling. I don't know, as long as it keeps running great I won't worry about it.
Philip S.
Philip S.
(sorry about hijacking your thread trucksleeper)
06-04-2005 | 09:59 AM
#19
Staging Lane
Joined: Jun 2005
Posts: 85
Likes: 0
It's the plating on the pistons that wears off - GM has had this problem since 1987 with the 2.8L MPFI cars - and the 3.1L...and the 5.7..and now the LS1 series....someday they will get it done right. It has 0 effect on performance.
06-04-2005 | 01:54 PM
#20
that's funny. when i got mine, it had the dino oil in it and it was loud as fark. since i put mobile 1 in it i can't hear it at all unless i put it in drive. and even then it goes away after about 20 seconds. i always let it sit and run for about 30 seconds anyway before i take off though.