Piston Slap?

[03.SS.6.0]

whenever my ss is not fully warmed up and im on the gas any time im over 3000 rpms i get a narly rattle that sounds like a spark plug knock. and i was told from a world class gm tech that owns an ss, that its just a piston slap, and its normal.. now does anyone think thats right???

[SSplaytoy]

piston slap is not good and there was a class action lawsuit about GM having the issue with a lot of their motors. Can you get us a clip of the sound?

[Jaymz]

ls/lt/lq motors are known for this.. Very common. Mine has done it for the last 70k miles when its cold for about 2-3 minutes then goes away.

 

Better than the chrysler "death rattle"

 

Info - Engine Knock on Cold Start #01-06-01-028A - (03/18/2003)

Engine Knock on Cold Start

1999-2002 Chevrolet and GMC C/K Pickup and Utility Models

 

2002 Cadillac Escalade (2WD)

 

with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, U -- RPOs LR4, LM7, L59, LQ4)

 

This bulletin is being revised to add an additional engine to the models section. Please discard Corporate Bulletin Number 01-06-01-028 (Section 06-Engine).

 

Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.

 

This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.

 

 

Important

At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended.

 

 

Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise your Area Service Manager.

Edited March 6, 2010 by JaymzSS (see edit history)

[Nscott]

Vortec syndrome

[BlueAKSSS]

ls/lt/lq motors are known for this.. Very common. Mine has done it for the last 70k miles when its cold for about 2-3 minutes then goes away.

 

My last truck 2000 GMC Sierra with 160,000 miles did this when it was cold for about a minute then it would go away completely once it warmed up a bit. Luckily my SS doesn't do it!

[smoothdime]

my last truck 2000 silvy had over 160k on it with no problems. more of a annoyance than problem. gary

[03.SS.6.0]

THANKS GUYS, ILL TRY TO GET AN AUDIO CLIP OF IT. BUT THE THING IS IT DOES IT FOR A LONG TIME SOMETIMES EVEN WHEN ITS FULLY WARMED UP. AND ITS NOT WHEN ITS IDLEING ITS WHEN IM ON THE GAS. I HAVE AN EXTENDED WARRANTY, MAYBE ILL BRING IT IN AND SEE WHAT HAPPENDS.. IDK SOME PEOPLE SAY ITS NORMAL AND OTHERS SAY ITS BAD. NOT SURE WHAT TO DO ABOUT IT.

Edited March 9, 2010 by Greco86 (see edit history)

[desrtrat]

if it is doing it when it's full warm, you may have a timing issue. or you may have a carbon build up in a cylinder(s)..

 

good luck