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Unread 03-26-2013, 08:11 AM   #1
Compgeek789
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1994 ZJ 
 
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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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Unread 03-26-2013, 08:35 AM   #2
GotMoose
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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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Unread 03-26-2013, 08:39 AM   #3
KoreaZJ
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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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Unread 03-26-2013, 11:35 AM   #4
JohnnyZJ
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high pressure = fine

low pressure = worry about it

if it WASN'T up there i'd be concerned
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Unread 03-26-2013, 03:36 PM   #5
Compgeek789
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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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Unread 03-26-2013, 03:44 PM   #6
wwch99tj
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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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Unread 07-13-2013, 08:28 PM   #7
Compgeek789
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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.
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Unread 07-13-2013, 08:46 PM   #8
wwch99tj
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I have since replaced the sender and everything is normal now.

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Unread 07-14-2013, 05:55 PM   #9
coralman
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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.
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