Quote:
Originally posted by cyanideg33
My 99 yukon denali has the same cold start knock. it has 99K on it and I thought it was just going bad!!! What a relief. It does go away after like 30 seconds after I drive it.
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I suspect the the knock is really a undersized piston in the bore and after 30 seconds to a minute the aluminum piston swells up with heat and noise goes away. I have never heard of carbon in a ring causing piston to rattle in its bore. That is BS. If it is rattling/knocking cold it is because the fit it too loose to begin with. I have a 25 year old AMC 360 that has piston slap in it for a minute or two on very cold days and has been that way for many years now. It is more annoying than anything though.