i have 1999 5.3 L. silverado.at startup oil pressure at 40 psi.when temp.gets to normal pressure drops to around 20psi. lifters start to tap. i pull over and turn engine off. 5 min. later start engin

Asked by May 05, 2014 at 12:02 PM about the 1999 Chevrolet Silverado 1500

Question type: Maintenance & Repair

1 Answer

90,865

I had a couple of engines do this too me also, 1 had a bad oil pump, the other had not been serviced properly and crud was plugging up the oil passages to the top end, and the 3rd was the cam bearings excessive clearance. Yours sounds like an oil pump failure.

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