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Old 06-03-2012, 08:50 AM
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Oil Pressure goes high then to 3/4 mark

Hello JeepGarge forum... Could anyone tell me what the reason could be for my oil pressure to be running high in my 2002 jeep grand cherokee 4x4?? When I first start the jeep the gauge goes all the way to H. When I am driving it stays there but when I am stopped it goes down the the 3/4 mark. The check engine light is not on. There is no other engine noise out of the ordinary, plenty of oil & "normal" oil drips, normal running temps.

I committed a sin & deviated from my normal oil & tried to use a "supposedly better" oil, Valvoline Max life. I didn't like how the jeep "felt" & drove. I noticed this 2 days ago & am pretty good at keeping an eye on my gauges. I thought that since this has never happened before, it must be the Valvoline oil. I did a oil change yesterday, going back to my normal oil and it is still doing it.

I'm thinking it is an oil pressure switch has gone bad, but any other thoughts?


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Model: 2002 Jeep Grand Cherokee 4x4
Miles:186,000 (engine changed @ 103,000)
Mods: none
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Old 06-03-2012, 08:56 AM
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Oil pressure sending units on these motors are notorious for acting funny and failing (4.7 motor). I verified mine with a true mechanical gauge.

If it is not a bad sensor then more then likely the oil pump's built in pressure relief valve is malfunctioning.

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Old 06-03-2012, 09:00 AM
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Re: Oil Pressure goes high then to 3/4 mark

Thanks for the reply. I did forget to mention that I have the 4.0 straight 6 engine...
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Old 06-03-2012, 09:26 AM
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I would try a new oil pressure sensor. They are fairly inexpensive.

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