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Re: 2000 5.3 oil pump issues?
It sounds like the oil pressure regulator which is inside the pump is sticking. This is not that uncommon for the ls engines. I just worked on an avalanche that was similar. On startup sometimes there wouldnt be pressure and also could here the valvetrain. With no pressure I could rev the engine and pressure would jump up to normal and stay there most of the times. I would change the pump.
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