Re: 5.3 knocks when warmed up
My sons 04 5.3 had a noise you would have swore was a rod. Raced the motor up several times in a row and the noise went away, let it idle for a while and the noise came back , sounded like a rod or broken flexplate to me. Turned out the catalytic convertor had come apart inside , cut it open , gutted it and welded it back shut .......NOISE GONE ....... Swore we were gonna have to put an engine in it. Something to think about ....!
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