Question about 2003 Chevrolet Silverado 1500

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Drop in oil pressure

Oil pressure gauge went from normal to 20 down to zero 3 times in the past 5 weeks 03 silverado 4wd 5.3L all three times about 40 miles into the ride

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The oil sending unit could be bad, or the pressure relief valve in the oil pump is malfunctioning.

Posted on Jan 28, 2009

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First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

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