Question about 1995 GMC Jimmy

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I have a 95 Jimmy. The oil pressure gauge suddenly dropped to 0. The vehicle runs fine and the oil was recently changed. Any idea what to check? or look for?

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Hello dogcollector: My name is Roger and I will help with your question. First if the pressure went to zero and the engine did not lock up or start knocking? I would replace the oil pressure sensor or check for a broken wire in the sensor area. I would also perform a oil pressure test. This is done on a cold engine through engine warm up to a hot engine. This will tell you if there is a major mechanical problem or just a bad sensor. Even if you just replace the sensor I would still have the pressure test done as this will give you a good idea of engine bearing problems. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

Posted on May 19, 2011

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I have a 01dodge RAM 1500 and the oil gauge keeps going from 40 to 0 and the check gauges light keeps coming on but I checked the oil and it's fine, what could be the reason for this


1. You need to have an independent oil pressure gauge hooked up to the engine to check the oil pressures at various RPMs and to verify the 40 to zero drop. This will eliminate any issue with the pressure gauge or the sending unit.

2. The oil pressure variation can be caused by an intermittent blockage in the oil pick up or an intermittent sticking oil pressure relief valve. I would possibly suspect the latter if you are getting good pressure and it is intermittently dropping to zero and going back up again..
If you or previous owners have not maintained the engine with frequent oil changes you will get a sludge build up problem in the engine and this will be evident by just dropping the engine sump.

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