I also have a loud knocking noise coming from the engine when it is warm or has been driven for more than 20minutes the dealer says its normal but at 21454 the noise is 3 times louder than ever befor. I took it to chevy and they said that cant do anything unless they hear it which I thought was reasonable and the next morning they called and stated my car has no noise even tho this happens every cold start. ![]() Every cold start the is a grinding and rattle noise that comes from the timing side.
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