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Old 08-18-2009, 01:06 PM   #1
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High oil psi and high temp

Afternoon GPr's. I was driving my jeep home today, 94 wrangler, and the oil psi gauged was pegged at 80, which is the max psi. I was wondering if there is anything I need to watch out for because of this if it was a symptom leading up to something else or what. Also, the temp was reading 210 which is about halfway on the gauge. Is there anything in particular I need to look at as far as keeping it running cooler or is that normal. I was doing between 60 and 65. Thanks.

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Old 08-18-2009, 04:22 PM   #2
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heh-heh, seems like most of the older yj`s oil pressure gauges show 80 lbs,,
Both of mine do/have. Check the sensor.
But no, normally it doesn`t lead to anything else going wrong (unless of the course you really have 80lbs of pressure) which is doubtful unless your jeep is a few quarts low.
As far as running cooler, I don`t know, my cherokee with the 4.0 runs around 200-210 when its hot outside and my wrangler runs about 190, you may be able just to get a lower temp thermostat

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Old 08-18-2009, 05:46 PM   #3
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210 is ok. it insures that all fuel is vaporized and burned. low temp can cause washing of the cylinders due to not burning all the fuel. this causes wear and tear.
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Old 08-18-2009, 10:49 PM   #4
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I have a 93 with the 4.0. Runs at 210 day or night, hot or cold outside. I have never had a problem with it. As for the oil pressure, it sounds like your oil pressure sender unit has gone out. Very simple to locate and replace. Mine attaches to the motor just above the oil filter and is threaded in. Simply unclip the wire going to it, unthread and replace with a new unit. OEM runs about 60.00 while aftermarket is about 30.00.

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Old 08-20-2009, 03:08 PM   #5
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Thanks for the advice. I have also talked to a couple of EN's that I work with and one said that the high psi could be from a dirty oil filter or maybe something inside causing it to be hi. One of them mentioned that I may have put too much oil but I only used 5 qts. But they mentioned using ZMAX to help clean the system. Would any of this make that big of a difference?
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Old 08-20-2009, 03:09 PM   #6
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Also what is the easiest way to test the sensors?
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Old 08-20-2009, 03:43 PM   #7
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You would have to hook up a mechanical oil pressure gauge. The sending units are the problem 99% of the time. It's an easy fix for about 30-40$. When they no longer work properly they usually stay at 80psi. I would just replace it.
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Old 08-20-2009, 08:47 PM   #8
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Thanks. I didn't think of that before but when I was idling it was hanging around 40 but as soon as I give it gas it shoots up to 80 no matter how fast I go or what RPM's I am running at.

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