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Old 01-13-2012, 08:30 PM   #1
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Default high oil pressure?

What should i do? Click the image to open in full size.
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Old 01-13-2012, 09:07 PM   #2
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I know pressure sending units have a bad habit of going sour, at least on the older XJ's, so that's my bet. Wait until someone else chimes in, though.

Ten Bob's Bucks says they'll say the sending unit is probably gone, but hook up to a mechanical gauge to make sure.
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Old 01-13-2012, 09:19 PM   #3
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Bob... you someone $10 more than likely oil pressure sending unit is crapped out, but also high possibilty of a bad ground so verify wiring is up to snuff.... Verify with mechanical gauge, sending unit is located at the oil filter adapter.

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Old 01-13-2012, 10:02 PM   #4
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My gauge was flipping out and all high up there and the harnesses were just disconnected..ha
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Old 01-14-2012, 06:38 AM   #5
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Almost assuredly the sending unit itself. Very common failure on the 4.0 When they go bad, they "usually" fail on the high side. If you buy one, buy it directly from Jeep for the best reliability/accuracy/mating with your factory gauge. Well worth the extra $20.
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Old 01-14-2012, 07:42 AM   #6
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Quote:
Originally Posted by tjwalker View Post
Almost assuredly the sending unit itself. Very common failure on the 4.0 When they go bad, they "usually" fail on the high side. If you buy one, buy it directly from Jeep for the best reliability/accuracy/mating with your factory gauge. Well worth the extra $20.
I always hear people talking about buying parts from Jeep. Earlier, it was thermostats, now it's OPSU's. I wouldn't mind doing so, but do you have a link where we can order stuff like that? My google fu is weak today.
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Old 01-14-2012, 08:46 AM   #7
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Quote:
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I always hear people talking about buying parts from Jeep. Earlier, it was thermostats, now it's OPSU's. I wouldn't mind doing so, but do you have a link where we can order stuff like that? My google fu is weak today.
Here is my source for OEM Mopar parts. You won't beat their price, even with shipping costs added.

https://www.moparonlineparts.com/
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Old 01-14-2012, 12:31 PM   #8
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Thanks guys.... I'll check on that today.
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Old 01-14-2012, 12:33 PM   #9
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With that said it means i don't have high oil pressure at all?
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Old 01-14-2012, 03:08 PM   #10
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If the engine is not making any unusual noises you have oil pressure. You'll know when you have no oil pressure, there will be a lot of bad noises.
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Steering stabilizers will not cure or cause death wobble, they only mask the real problem that is causing death wobble. Oil pumps do not make pressure, they create flow. Bearing clearence and restrictions make pressure. It's the crank sensor.
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Old 01-14-2012, 06:04 PM   #11
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Quote:
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With that said it means i don't have high oil pressure at all?
Most likely, yes. I'm guessing faulty sending unit here. I've replaced mine twice on my 99 already for unusually HIGH readings. You have to rule this out before looking elsewhere.
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Old 01-14-2012, 06:22 PM   #12
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It's working good now.
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Old 01-14-2012, 06:45 PM   #13
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It's working good now.
It will most likely come back. The "self healing Jeep" has not yet been invented!
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Old 01-14-2012, 08:10 PM   #14
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Quote:
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It will most likely come back. The "self healing Jeep" has not yet been invented!
Mine is self healing...When it breaks I fix it my SELF.
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Steering stabilizers will not cure or cause death wobble, they only mask the real problem that is causing death wobble. Oil pumps do not make pressure, they create flow. Bearing clearence and restrictions make pressure. It's the crank sensor.
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Old 01-14-2012, 08:41 PM   #15
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I had this issue also, replaced the sending unit and it is fine now. Got mine from Autozone.
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Old 01-14-2012, 08:41 PM
 
 
 
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