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Old 01-06-2006, 04:35 PM   #1
AJWatUC
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Question My Oil pressure gauge is reading 80. Why?

I started driving today and my oil pressure gauge went up to 80 so I put it in N and it went back down to 40 then i went in to gear again at about 2000rpm's and it would climb to 60 and stay for a couple seconds then go back up to 80 so I parked it and now it sits. I think maybe it has something to do with the valve cover air filter i put on might be clogged. So I'm going to replace that when I get home other than that I don't know what else it could be any Ideas? thanx!
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Old 01-06-2006, 05:41 PM   #2
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Is this when it is cold?
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Old 01-06-2006, 06:09 PM   #3
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Yeah it was probably around 30 or so today and i just started it my jeep has a 120,000 miles on it
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Old 01-06-2006, 06:31 PM   #4
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I heard that Chrysler oil pressure sensor when grounded will read 0 and if not grounded will read what they're supposed to, and if not connected at all it will read 80. I don't know about the temperature differences and all that but I know if I ground my guage to my frame it reads 0 and disconnected it reads 80. maybe you have a short in your oil pressure sensor??
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Old 01-06-2006, 06:59 PM   #5
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sounds like your oil pressure regulator (Happened to me a few weeks ago with my YJ, little 40 dollar part) check your connections first, if all is well check to see if it's shooting out out of the dipstick tube etc. Try replacing it and see if that helps.

if you dont change your own oil, sometimes the quick lube places may bump it when taking off your oil filter, it's plastic so it can crack very easily. Even a small crack can cause it to do the same thing.
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Old 01-06-2006, 07:46 PM   #6
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As said, the most common villain is the sender...Check the ground. If you have a mechanical gauge you can borrow, you can get a comparative test reading in case something IS actually wrong internally...a plugged filter and poorly functioning bypass can cause erratic readings.
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Old 01-06-2006, 07:53 PM   #7
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Quote:
Originally Posted by UTexas95YJ
sounds like your oil pressure regulator (Happened to me a few weeks ago with my YJ, little 40 dollar part) check your connections first, if all is well check to see if it's shooting out out of the dipstick tube etc. Try replacing it and see if that helps.

if you dont change your own oil, sometimes the quick lube places may bump it when taking off your oil filter, it's plastic so it can crack very easily. Even a small crack can cause it to do the same thing.
If it isn't shooting out of my dipstick tube then most likely its the sensor right so it would be ok to drive for the weekend until I can get to the dealership right? or wrong?
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Old 01-06-2006, 08:38 PM   #8
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Quote:
Originally Posted by AJWatUC
If it isn't shooting out of my dipstick tube then most likely its the sensor right so it would be ok to drive for the weekend until I can get to the dealership right? or wrong?
Because of design, high oil pressure will not cause dipstick shooting...High oil pressure is caused (except by sender) through pressure in the oiling galley,; that is not connected to the crankcase where the dipstick is. The dipstick starts to leak because of excessive crankcase vapor pressure. This comes from air/gas vapors that escape into the case from the rings/valves. THAT ISN"T what the sender/oil pressure measures...The two are not directly related.

The sender measures the forces acting on the LIQUID oil in the motor, it doesn't register effects on gas/air/oil VAPOR.
So, to answer your question: There is a problem...since we don't have an answer as to what's causing it, driving is 'a little risky', but unless you get NOISES that would be directly related to oil starvation as a result of blockage (causing high pressure readings) nothing is getting damaged...But, you could blow a seal...eventually, depending on other factors.
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Old 01-06-2006, 08:45 PM   #9
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my fault and the actual part I was referring to earlier is the Oil Sending Unit

I'm tired sorry
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Old 01-06-2006, 09:16 PM   #10
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Quote:
Originally Posted by gutthans
As said, the most common villain is the sender...Check the ground. If you have a mechanical gauge you can borrow, you can get a comparative test reading in case something IS actually wrong internally...a plugged filter and poorly functioning bypass can cause erratic readings.
I just changed my oil a week and a half ago if that makes a difference. I'm going to try to get to the dealership tomorrow and and get the sender. Hopefully thats all it is. if not i'll be looking for your guys help again
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Old 01-09-2006, 02:39 AM   #11
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I changed my oil and it didn't help. I'm going to hopefully change the sensor today. But I don't see how it could be the sencor because My gauge is reading like it normally would. For instance when you turn on the jeep it goes up, but instead of going up to say 20 or 30 it goes to 40 at idle. then when I start driven it starts climbing to 80. So with all that said do you guys still think its the sensor?
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Old 01-09-2006, 03:23 AM   #12
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Thats exactly what my 90 did when I bought it. Oil sending unit was bad $22 at Napa Auto Parts cured it.
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Old 01-09-2006, 10:55 AM   #13
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yeah be sure you say "Sending Unit" at the parts store

mine did the exact same thing.
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Old 01-09-2006, 02:34 PM   #14
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Yeah that wasn't it now what?
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Old 01-09-2006, 03:05 PM   #15
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ok you are going to have to change your oil again, but you might try this

drop the whole oil pan, take a clean cloth, and wipe off your pickup.

sometimes if you go through some snotty gumbo type mud it can get in there and clog it up.

might be something to consider
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I almost sold the heep to get married, but instead I sold the girl! hahaha...
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