Posted by rankrank1 on August 15, 2010 at 06:12:52 from (69.171.171.156):
In Reply to: OT gm 3.1 making noise posted by jeremy in NE on August 14, 2010 at 19:51:55:
The GM 3.1 Liters fall into what is known as a short skirt piston design engines and as such commonly experience what is known as piston slap under cold start up. We have a 98 Buick Century with 196k miles that sounds like a diesel when you start it but does quiten down as it warms up as the alloy pistons expand some at operating temps.
FWIW the 1999-2002 GM trucks with the 4.8l and 5.3l were prone to the same thing. GM always stated that it does not hurt anything, but they did make some mior changes around 2003 to reduce customer complaints.
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