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I could be a bad wrist pin. They will sound just like a rod. Try letting it idle and pulling the plug wires one at a time. When you hit the one that has a problem the noise will go away or almost away. Then you can take that rod cap off and check it for a spun bearing.

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Q: 2000 jeep 4.7 rod noise but rods and bearings are fine what could it be?
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