Question about 2002 Jeep Grand Cherokee

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Oil pressure gauge reads normal when first starts. as it warms up, gauge goes to zero. If I rev engine, gauge goes back to normal.

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Two things...when it reads zero, is there any engine noise (tapping or knocking)? After you rev the engine does the pressure read normal at idle and function normally, or does it go back down? Either way, you should not drive the vehicle 'till you have a mechanical gauge (yours is electro-mechanical) put on there and the actual pressure is tested. The condition may be a bad sending unit, a bad bearing or possible obstructed oil pump screen. The repair is obviously different for each one and the price is as well.

Posted on Oct 20, 2009

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2002 jeep grand cherokee with 4L v6...110k on motor...oil pressure reads normal at start-up and goes to very low when warm(with a slight ticking)....and goes back to normal when the engine is reved....ticking is NOT 100% constant however.....there are times of no audible engine noise out of ordinary....oil and filter just changed 200 miles ago...this vehicle was not properly mantained prior to my owning

Posted on May 05, 2011

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Well it could be the sending unit for the gauge.
But odds are the oil pump or engine bearings are worn out.
As the engine warms up, the metal spaces expand and the oil gets thinner. The oil pressure drops some under normal conditions, but not more than 10 or 15psi. Normal idle pressure with the engine warmed up is probably 25psi.
You could check oil pressure with a mechanical gauge to make sure its not the sending unit.
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After vehicle has warmed, the oil light comes on under 1100 rpms . rev the engine the light goes off


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After 15-20 minutes of driving my oil pressure starts to drop when I slow down or stop. It hits zero unless I rev the engine or contine to move. It's fine as long as I keep moving or rev the engine


i had same problem and its just oil pressure sending unit its above oil filter just check it if you got some loose wire or somthing .........my problem was ;i had oil in conector i clean it and works jyst fine

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