Question about 2002 Ford Ranger Regular Cab

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Fluctuating oil pressure gauge after 20 plus minutes of operation

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If you have checked the oil level and know it is full and not overfull, then you need to stop driving the truck until you solve this problem. It can be nothing more than a loose wire on the oil pressure sending unit. Or the sending unit can be bad. The gauge can also be bad. But is can also be a weak oil pump, or clogged oil pick-up screen. Considering it does this after it reaches normal operating temperature this is very suspicious and sounds like possibly engine wear. An oil pressure test and compression test will help diagnose the cause. You can just go ahead and check the wiring at the oil pressure sending unit and replace it if the wiring is good to eliminate that as a cause. If it is leaking it is for sure bad.

Posted on Nov 16, 2009

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The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.

The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.

If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.

If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.

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