01 silverado 4.8 knocking

[allaboutchevelles]

Hey guys, Im from the 60-66 C10 forum room mostly. I have been having problems with my DD for a while now. Its a 01 silverado ext cab 2 wheel drive with the 4.8 engine. For the last about 2 years every time I start it after sitting for several hours the motor has a bad KNOCKING sound. It goes away right after the motor warms up for about 3 or 4 minutes. Ive heard alot of problems with this and chevrolet says it will not hurt anything. The truck only has 95,000 miles on it with regular oil changes every 3500 miles. What is causing this and is there anything to do to fix it??? Thanks!!