High Engine Oil Pressure

4LowandGo · May 27, 2008

I have a 92 XJ with a 4.0 and auto tranny. The 4.0 has around 226,000 miles on it and it still runs really strong. I have noticed that the oil pressure runs anywhere from 40 to 80+ while warm, and if I'm on the trail it usually stays towards the high end. The engine sounds a little like a diesel engine sometimes when the pressure is way up there too.

Is this normal? What can I do to fix it?

Thanks!

Saudade · May 27, 2008

What kind of oil and oil filter are you using? Did you change it recently?

4LowandGo · May 27, 2008

I changed it about 700 miles ago. I'm using Castrol 10w30 and a Purolator oil filter. It was their premium filter at the parts store, but I will say I've never used that filter before. I'm guessing my first option will be to switch to a different brand filter and change the oil. Any other comments are welcome though.

Thanks!

Oh yeah... The oil level is good on the dipstick too...

Frosteez · May 27, 2008

I just picked up a 90XJ last week. I've actually got the same thing going on.
May want to check your air filter too... I'm getting oil through the breather when it gets up there

runs like a champ otherwise, I'm due for an oil change now, it's running 5w30 now.

4LowandGo · May 27, 2008

I checked the air filter and replaced it. It's had that problem before and it was due to two clogged plastic elbow things on the top of the valve cover. I can't for the life of me remember what they were called, but those significantly fixed the blowby. Thanks for the tip anyway!

For Frosteez... Check this website out:
http://jeep.off-road.com/jeep/article/articleDetail.jsp?id=257985

Saudade · May 27, 2008

Well, I first say, can you get a mechanical gauge and verify the pressure? Could be just a whacky sending unit. If not, let it sit overnight and then change the filter to a different brand. There shouldn't be anything wrong with the brand you bought but who knows about the specific filter.

The tubes are different on a 92 v 90. The 90 (and other Renix years like my 88) have a CCV system with a small metered orifice in the tube in the rear of the valve cover. This can get clogged and allow oil to flow into the air box fromthe front tube.

Frosteez · May 27, 2008

thanks!!! I'll have to replace those when I do my oil.

4LowandGo · May 27, 2008

Saudade said:
Well, I first say, can you get a mechanical gauge and verify the pressure? Could be just a whacky sending unit. If not, let it sit overnight and then change the filter to a different brand. There shouldn't be anything wrong with the brand you bought but who knows about the specific filter.

The tubes are different on a 92 v 90. The 90 (and other Renix years like my 88) have a CCV system with a small metered orifice in the tube in the rear of the valve cover. This can get clogged and allow oil to flow into the air box fromthe front tube.

I'll try the oil and filter first, and then I'll move to the sending unit and so on.

High Engine Oil Pressure

4LowandGo

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Saudade

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4LowandGo

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Frosteez

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4LowandGo

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Saudade

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Frosteez

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4LowandGo

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