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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.
At this point I would strongly suggest that you have your mechanic hook a mechanical oil pressure guage to the engine and make absolutlely sure that the pressure is up to manufacturers standards. It may simply be a failing oil pressure sending unit, but, until you know, it could turn out a lot more expensive! Thank you, Dana
are you getting oil pressure when the car is warm have you changed the oil recently or is it overdue if you have an oil pressure gauge on your dash check to make sure you are getting propper oil pressure as this is what it sounds like you are losing oil pressure and your valves are tapping.
Don't delay on this. Take the vehicle in and have the oil pressure sensor checked. It could be just the sensor or it could be something more serious. A drop in oil pressure could lead to catastrophic engine failure.
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