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Old 01-08-2012, 06:21 PM   #1
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High oil pressure.

MY TJ 1999 oil pressure just started to to go high. When I was driving on the two track in 2cond gear the oil pressure maxed out. Any suggestions on what the problem might be? Thanks.

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Old 01-08-2012, 06:27 PM   #2
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its probally the sending unit just had the same problem last month took me 10 min and $50 easy fix

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Old 01-08-2012, 07:25 PM   #3
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Before replacing the sender, flush the cruddy oily gunk out of its electrical connector with WD-40 and shake the excess out before reconnecting it. The connector can sometimes develop a high resistance connection inside from being dirty which can cause a high reading.

Odds are very good the sensor is actually bad as stillsmokin8 suggests but at least try something that is free first.
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Old 01-08-2012, 07:34 PM   #4
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It's either the sender, or a stuck relief valve in the oil pump....
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Old 01-08-2012, 07:52 PM   #5
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Thanks I will check it out.
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Old 01-08-2012, 08:11 PM   #6
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Where is it located.
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Old 01-08-2012, 09:09 PM   #7
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Where is it located.
it's on the passenger side rear of the 4.0 by the oil filter. don't remember where it is on the 2.5
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Old 01-08-2012, 09:28 PM   #8
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Thanks
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Old 01-28-2012, 05:51 PM   #9
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I had high oil pressure in my 4cyl 2000 Wrangler. It would max out when I turned key on which ruled out the gauge because it was actually reading. The only other things it could be would be a bad sender or clogs somewhere with sludge. The guy who suggested cleaning the sending unit gave me an idea. I had read bad things about engine oil flushing/cleaning and destroying engines, but I had heard good things about an old-school product called Marvins Mistry Oil. It's supposed to be an oil with a gentle cleanser which will clean up sludge without clogging things up. I put in 1/2 quart cost me $6 and soon my engine sounded better than it had in years. My sending unit must have been gummed up because in a couple of days it started reading normal when I was driving at speed but went back up when idling. Soon it was reading normal all the time. This engine has had a tick on startup for 100,000 miles but the tick is now gone. Marvins is old-school mechanics stuff and I am impressed.
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Old 01-28-2012, 06:16 PM   #10
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Marvel Mystery Oil is essentially kerosene, not much else. Kerosene is not much of a mystery, it's essentially nothing more than a petroleum byproduct that is a solvent. We also used to use kerosene in lanterns when I was a kid when all gas stations had pumps inside the service bay with various viscosity oils, kerosene, etc. to be hand pumped as needed.
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Old 01-28-2012, 07:49 PM   #11
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I know its weird, but for me it was LOW oil! Mine was almost maxed out and I checked oil and it was down to 5quarts, instead of 6quarts. I filled her up and now its back to 40 or just above, which is normal again for me. Maybe it was just putting the fresh oil in, or maybe it was because it was low, im not sure.
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Old 02-01-2012, 01:17 PM   #12
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Originally Posted by Jerry Bransford View Post
Marvel Mystery Oil is essentially kerosene, not much else. Kerosene is not much of a mystery, it's essentially nothing more than a petroleum byproduct that is a solvent. We also used to use kerosene in lanterns when I was a kid when all gas stations had pumps inside the service bay with various viscosity oils, kerosene, etc. to be hand pumped as needed.
Marvel mystery oil is
70% Light Aromatic Oil (Pale Oil)
- It is a Naphthenic Oil, so while it oxidizes faster than a Paraffinic oil, it does clean and dissolve sludge and carbon well and cleans up after itself from any oxidation. serves as base oil as well. [Naphthenic oils have more solvency and are more polar (they are attracted to metal more), but oxidize faster.

29% Mineral Spirits
- Cleans Varnish very well. General cleaner. Also acts as an antioxidant.

38 parts per million (ppm) Boron
- AW/EP agent, friction reducer, antioxidant

900 ppm Phosporous
- AW/EP agent

1/2% 1, 2 ortho-Dichlorobenzene
- EP agent as it interacts with Iron to form an Iron chloride barrier under any ZDDP or other AW additives. Also very good cleaner/solvent, and friction reducer

1/4% 1, 4 para-Dichlorobenzene
- EP agent as it interacts with Iron to form an Iron chloride barrier under any ZDDP or other AW additives. Also very good cleaner/solvent, and friction reducer

Oil of wintergreen - for the scent
- Not just for the cent, is also a cleaner. may aid lubricity.

Red Dye - for the color
- well this one just colors the stuff

VOA MMO? - Bob Is The Oil Guy
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Old 08-15-2012, 03:58 PM   #13
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Oil Pressure high...

I have a rebuilt motor, on a 94 Wrangler, going on about 2000 Miles now, and I suddenly now have high oil pressure when driving at speed. It is almost maxed out at 80. But when I am idling, it is just above 40. I cannot remember if I had the sender replaced. Is this ok to be driving it to and from work, with the oil pressure this high? Or is it ok, if it is just the sender? Will I do more harm by driving it?
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Old 03-19-2013, 05:57 AM   #14
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i know this is old but the last few days my tj (97 SE 2.5L with AX5) is running higher than normal oil pressure. Does have a slight oil leak if that matters. Not much experience with this stuff so if anyone could give me a specific place to start looking or a pic of what im looking for it would be really helpfull.
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Old 03-19-2013, 11:48 AM   #15
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i know this is old but the last few days my tj (97 SE 2.5L with AX5) is running higher than normal oil pressure. Does have a slight oil leak if that matters. Not much experience with this stuff so if anyone could give me a specific place to start looking or a pic of what im looking for it would be really helpfull.
Turn the key on without starting the jeep… if your oil pressure reads above zero, its time to replace the sending unit.
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Old 03-20-2013, 11:21 AM   #16
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cool ill try it when i leave work. thanks

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