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-   -   Oil Pressure goes high then to 3/4 mark (http://www.jeepgarage.org/f203/oil-pressure-goes-high-then-to-3-4-mark-42865.html)

TACFIRE325 06-03-2012 08:50 AM

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?


Stats:
Model: 2002 Jeep Grand Cherokee 4x4
Miles:186,000 (engine changed @ 103,000)
Mods: none

scjeep4.7HO 06-03-2012 08:56 AM

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.

HTC Thunderbolt 2

TACFIRE325 06-03-2012 09:00 AM

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...

scjeep4.7HO 06-03-2012 09:26 AM

I would try a new oil pressure sensor. They are fairly inexpensive.

HTC Thunderbolt 2


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