overkill 19

My 03 6.0 2500 knocks or loud tick when I first start her up cold. Within 5 mins "when warm" its gone. I'm thinking exhast leak but cant find yet. Anyone had the same problem?

7845

iTrader: (1)

its normal. its piston slap

viciousknid

iTrader: (8)

+ 1,000,000,000

GMCtrk

iTrader: (27)

My 02 LQ9 has zero piston slap. The 00 4.8 did.

overkill 19

Its pretty loud, at first I thought a valve had dropped or crank bearing gone, but when it went away that ruled them out??? With the windows up and radio on low you can hear it. I've never heard piston slap before ether so it very well could be. Thanks

JakeBrakeIH

iTrader: (22)

yep mine does it as well...usually when I change the oil it quiets it down quite a big

overkill 19

Thanks fellas, I do need to change the oil. I'll see if it helps. Thanks alot.

viciousknid

iTrader: (8)

Try some Lucas. Might help a little
Some people don't have any. Mine had it when i got it. and Some people say it sounds like a diesel. So it just varies. I run 10w30 syn instead of 5w30 but i don't know if that's why i haven't heard it.

7845

iTrader: (1)

when using the thin 5w30 our motors tick more then they do with a heavier oil. 10w30 helped quit down my 5.3. later on when i was a 6.0 i used 20w50 and had no slap or noise from motor