Oil pressure high!!

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12-18-2012, 10:52 PM

DenaliRanger1

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Year: 2000

Model: Cherokee

Engine: I6

Oil pressure high!!

My jeep has always been around 35 oil pressure on idle and rose to around 50 when accelerating. Now it idles around 45 and rises to 70 while acceleration.. as of today.. any thoughts on this.. Thanks.. REDZ

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12-18-2012, 11:10 PM

cmartin2112

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Year: 1989

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Engine: 4.0L Renix Freshly Rebuilt!!

Probably the oil pressure sending unit. They are pretty cheap so you could replace it and see if that helps. If not, I would rent a oil pressure tester and verify those readings are correct.

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12-19-2012, 07:11 AM

bigbadon

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Year: 2004

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Jeep oil gauges are not meant to be taken seriously. Hook up a mechanical test gauge if you really want to know what your pressure is.
If in fact it is high there are only 2 causes: spun bearing or clogged oil galley.

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12-19-2012, 10:04 AM

tjwalker

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Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cmartin2112

Probably the oil pressure sending unit. They are pretty cheap so you could replace it and see if that helps. If not, I would rent a oil pressure tester and verify those readings are correct.

^^^This.

The oil pressure sending unit is a very common failure on the Jeep 4.0 engine. If you buy one, I recommend buying a Mopar unit directly from Jeep for the best reliability/accuracy/mating with your factory gauge.