High Oil Pressure - JeepForum.com

 
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post #1 of 10 Old 03-26-2013, 08:11 AM Thread Starter
Compgeek789
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1994 ZJ 
 
Join Date: Jul 2011
Location: Conway
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High Oil Pressure

I have been searching all around the web for a reasonable cause, but couldn't find anything. Last summer I was having electrical issues, but the oil pressure gauge was reading dead center, barely any fluctuating. Then, the mechanic screwed a bunch of crap up and nearly destroyed it trying to fix a starting/stalling issue. But after he worked on it the mechanic started the vehicle and the oil pressure gauge soared to 60~80. I tried to ask what was up with the pressure, and he ignored the question. While running cold, it stays there, and most of the time while running hot. When accelerating, the oil pressure goes either a little bit down or a little bit up. The needle also seems very twitchy, and it has maxed out over 80 PSI a few times. I use Castrol Edge 10W-30, and get my oil changed every 3500 miles. 212,000 miles, 5.2L engine. Could this possibly be due to sludge, sensor or pump issues?

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post #2 of 10 Old 03-26-2013, 08:35 AM
GotMoose
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1994 ZJ 
 
Join Date: Jul 2009
Posts: 54
The oil pressure sending unit is a really cheap design and not very reliable. Rent or buy a mechanical gauge to check for any issues with the oil pressure. I've changed my sending unit 3 or 4 times over the years. When they are about to fail, they can give extremely high or low values or a twitchy needle. If the internal membrane (which is plastic or rubber) rupture, it will start leaking lots of oil.
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post #3 of 10 Old 03-26-2013, 08:39 AM
KoreaZJ
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1994 ZJ 
 
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Check the connection is clean and tight.

Measure sensor resistance...
0 psi = ~1 ohm
40 psi = ~46.5 ohms
80 psi = ~87 ohms
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post #4 of 10 Old 03-26-2013, 11:35 AM
JohnnyZJ
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2007 JK Wrangler 
 
Join Date: Oct 2008
Location: Calgary
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high pressure = fine

low pressure = worry about it

if it WASN'T up there i'd be concerned

07' JKUR rollin on 35s
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post #5 of 10 Old 03-26-2013, 03:36 PM Thread Starter
Compgeek789
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1994 ZJ 
 
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Location: Conway
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Ahh the thing goes all over the place, but mainly high. I will check the sending unit to see if it works, and borrow a pressure gauge from the school's auto shop.
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post #6 of 10 Old 03-26-2013, 03:44 PM
wwch99tj
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1999 TJ Wrangler 
 
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Does it read 0 when the ignition is on engine off?
Mine reads almost 20 with just a ignition on, almost 80 going down the road...

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post #7 of 10 Old 07-13-2013, 08:28 PM Thread Starter
Compgeek789
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1994 ZJ 
 
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I think it is either a connection problem, sender or gauge itself if you read 20 psi when the ignition is in run position with engine off.

RIP 1994 ZJ 5.2
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post #8 of 10 Old 07-13-2013, 08:46 PM
wwch99tj
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I have since replaced the sender and everything is normal now.

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post #9 of 10 Old 07-14-2013, 05:55 PM
coralman
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1998 ZJ 
 
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If you replace the sensor I would get a Mopar. I bought an aftermarket one and barely tapped it while working and the top popped off. Holding the two in your hand, you can see the manufacturing differences.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #10 of 10 Old 11-07-2014, 11:07 PM
SweetPEALvr15
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1996 ZJ 
 
Join Date: Mar 2012
Location: EL Paso
Posts: 23
Ok I'm having the same problem and I replaced the oil pressure sending unit on my 4.0 per advice I've searched on here but my gauge is still going crazy just as the original poster said yet my problem is persisting, any ideas? this occurs in conjunction with my jeep shuddering and feeling like it wants to die when I'm not pressing on the gas. really stumped and frustrated after I've replaced bad upstream O2 sensor re sealed both valve cover and oil pan.
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