Not in my Vette, but my wifes Denali. I've already had the engine replaced in my '01 HD for the same thing, and tonight I noticed hers is worse than mine was. TSB's? Anyone else hear of this? :confused:

 

You are going to love this :rolleyes:

Info - Engine Knock on Cold Start #01-06-01-028
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, U -- RPOs LR4, LM7, LQ4)

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 is 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.

 

:rolleyes: Great...Just great. :(

 

In other words,GM came up with a new piston design to adress the C-5,but the noise is normal for your truck :confused:

Rumor has it that future generation 3 motors will eventually get the new design piston,like the 2002 C-5 :yesnod: The C-5 being the guinie pig ;)

 

Since my re-ring, my C5 sounds like a diesel on cold start-up.....but according to GM I don't have a problem either. At least until I ram so much legal paperwork up the dealer service manager's rear that his rectum will be nothing but a big paper cut :mad :mad :mad :mad :mad

 

Have the "knock" on our '01 Suburban, '02 Cadillac DTS and '02 C5 Coupe. Hows that for frustrating. :confused:

 

It's a shame that you have to do it that way, but it seems that's the only way to get their attention. :mad :smash: