Question about 2003 Buick Rendezvous

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No oil pumping, oil pressure light beeped every few seconds, parked vehicle, still full of oil, but no oil distibuted

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  • Jason Johnson May 11, 2010

    How do you know its getting no oil? The sensor may be faulty if not get a new oil pump installed.



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It is either plugged in a oil hole in engine , or the pump in pan needs service or replaced.

Posted on Apr 27, 2010

  • carl Apr 27, 2010

    if you arent sure if oil or guage is bad. check oil pressure sending unit first.



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I bought my 1999 Lincoln Continental as a second vehicle. Drove it home with no apparent issues. The man I bought it from told me that an O ring needed to be replaced on the transmission pan and had a slow...

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Hello, I have the same issue like bjmadm1234 posted. The solution suggested unfortunately does not work for my car (Dodge Grand Caravan 1997). We already exchanged the Oil pressure switch, after driving a...

I would suspect that you have a weak or failing oil pump, however before condemning the pump I would do a physical oil pressure check with a gauge. Oil pumps are not easy to replace so lets make sure it is the problem before replacing it. For reference yours can be done with the motor in the vehicle.

Physical Pressure Test:

This may require you to tuck a oil pressure gauge under the driver side wiper arm and go for a short drive to make the situation replicate. Depending on how you hook up the gauge (in place of oil pressure switch) the light will be on full time during the testing and this is ok. If you can replicate this symptom that you are reporting in the drive way in gear it is desirable as you can better read the gauge.

The oil pressure should be:

3.0L = Oil pressure should be 6 PSI at idle and 35-75 psi at 3,000 rpm with engine at normal operating temperature.

3.3L = Oil pressure should be 5 psi at idle and 30-80 psi at 3,000 rpm with engine at normal operating temperature.

You see that there is a large "in spec" region for the 3,000 rpm range as listed. I would look for the pressure to be at the higher end of the scale and the idle pressure to be right in spec. If any of these pressures are low I would suggest changing the oil pump.

If your motor is one that I have not listed here please comment back and I will provide the appropriate spec per the motor in your van.

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When to car warms up and rpms are at lowest point the oil pressure light comes on. i had the oil changed and the level is full. it does not happen all the time. it only happens when the engine is at...

There are two basic causes. One, that your oil pressure is really too low at idle. You did not state the mileage, but if the vehicle is high-mileage, this is a possibility. The other is the oil pressure sender is bad, and reporting low pressure when it is actually OK. The best way to know for sure is to have a shop test the actual oil pressure using a calibrated gauge. If the vehicle is lower mileage, and you think the pressure is really OK, it may be cheaper for you to just replace the sender as a test(if you are mechanically inclined enough to do it yourself). If the warning light goes out, the old sender was bad.

If replacing the sender does not cure the problem, then you have low oil pressure. This will shorten the life of the engine, so you need to have a mechanic diagnose the problem. Possible causes are: bad oil pump, excessive bearing clearances due to high mileage, oil pump intake blockage due to sludge in the oil pan, stuck pressure relief valve. Unfortunately, none of these problems will be cheap to fix.

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