Question about 2001 Chevrolet Silverado 2500

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I get a clunking noise from the front of my truck when I cold start it and only for a few min as is warms up then it goes away. This started in cold weather 35-60F. I have a chevy silverado 2001 1500 4.8L. only mods I made before the noise was a ram air intake, cat back flowmaster ehaust and put synthetic blend 5w-30 motor oil rather then the basic 10w-30 the used to be in there. The noise didn't start right after all these things about 2-3 weeks later it did. Not sure where the noise is coming from for sure and I cant hear it that well outside the truck while it running with the exhaust.

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This engine has forged pistons whitch expand more than hyper-u-tec-tic pistons when heated . this is normal for this engine . my brother has a chevy silverado 2001 1500 4.8Lwith 650,000 kms and he said his made that noise when it was brand new and the dealer said this is normal. the truck still runs like new with lots of power and it still makes that noise before it reaches operating temp then goes away.My brother uses lucas oil treatment and it helps quiet the knock a little when cold.

Posted on Jan 03, 2011

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