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Re: Engine noise 2000 Tahoe 5.3
Most of the 5.3 engines have a subtle knock as it warms up. In this case it had a severe carbon problem on the valves and piston tops. Cleaned it with the fuel system cleaner and it's ran like a top since. My 6.0L has a knock until it warms up as well and it's an 07with 75k.
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