Quote:
Originally Posted by ksbrktracer
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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I have considered that. I've beat on both cats with a hammer to see if the noise changed, nothing. I also put my stethoscope on them while I was under there and didn't really hear the knock as loudly as I do closer to the front. I do hear it pretty clearly on the exhaust manifold though, so I haven't ruled out the cats just yet. Did your noise increase with engine speed until it went away? Mine does, that's what's making me lean towards something loose in the rotating assy, but I'm sure hoping that's not the case.