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Old 02-21-2012, 05:20 PM   #1
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Problem with Oil Pressure Gauge

I have a 1991 Jeep Wrangler with the 2.5 liter. I am having a problem with my Oil Pressure Gauge. When I turn the key to the "on" position the needle reads 10psi. When I start the engine it goes to about 75-80psi. Sometimes it stays there even when at idle. Other times at idle it reads about 40psi but when ANY acceleration is applied it shoots to 75-80psi. I never reads inbetween those two settings no matter the RPM's I don't have any oil leaks so I don't think its reading correctly at 80psi when I'm driving down the road at 2000rpm. I have read alot of the threads and found that the problem can be either sending unit or the gauge itself. My big question is.....is it more likely the gauge due to the fact that when I turn the key to the "on" position it reads 10psi? Any help would be appreciated.

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Old 02-21-2012, 06:36 PM   #2
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Simplest fix is a mechanical oil pressure guage for around $20.00

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Old 02-21-2012, 06:40 PM   #3
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That sounds normal to me. My oil pressure never drops below 55 and while I'm driving it stays between 70-80. Same with everyone I know that drives a yj.
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Old 02-21-2012, 06:49 PM   #4
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bad sender

Sound like a bad sensor.
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Old 02-21-2012, 08:31 PM   #5
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Thanks for the info guys. I really appreciate it.
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Old 02-21-2012, 08:41 PM   #6
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I'm picking up my third oil sensor this weekend. The last two new sensors pegged out at 80 psi and stopped working.

So like you I've done a lot of asking on this board the last couple weeks.

I would agree with ballistx but if it pegs out at 80 under load then returns to 40/50 at idle...sounds like its working fine--I'm jealous.

It could be you (and me)--I've been told if the oil pump flap sticks, it's going to blow sensors. That's a rebuild I'm not ready for yet.

But it COULD be the sensor...you also said it pegs out at 80 at idle also which sounds like a crappy part. If your rubber gasket is seated right between the connectors and clip is sound you should be allright--something to doublecheck.
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Old 02-21-2012, 09:23 PM   #7
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I had an issue with my sender as well. It's a common issue. I had a mechanical gauge laying around one a short hose and screwed it in and observed the actual pressure then replaced the sender and now I get a reading on my dash gauge very close to what I was seeing on the temporary mechanical gauge.
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Old 02-22-2012, 08:47 PM   #8
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Does anyone know where we can take out our gauges and get them rebuilt?
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Old 02-23-2012, 04:06 PM   #9
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Thanks!
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Old 02-27-2012, 12:25 PM   #10
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I've researched this problem in my Yj for hours and talked to dozens of people, seems like a common problem was told as long as oil level stays the same all is well.

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high oil pressure , oil pressure gauge issue , oil sending unit issue

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