Oil Pressure today read high all in the suddenly then go back to normal. - JeepForum.com

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post #1 of 18 Old 01-10-2014, 02:11 PM Thread Starter
FordExplorer
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Oil Pressure today read high all in the suddenly then go back to normal.

Oil Pressure sometime read high all in the suddenly then go back to normal. Oil Change was done with Regular 10w-30 at a Chrysler dealership last week . It this something I should worry about ?
I replace my cluster for a 2004 model one IDK if this have something to do with .

2000 Jeep Grand Cherokee 4.0 178,000 miles

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post #2 of 18 Old 01-10-2014, 07:08 PM
Jaspah
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The oil pressure sending unit is likely starting to fail. It's non-essential to the engine, very quick and easy to replace, and fairly cheap.

I replaced mine a month or two ago because it would occasionally peg 80 and stay there until it went away by itself or I restarted the engine. Eventually it got worse, to the point where it would just be pegged at 80 indefinitely until I replaced it.
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post #3 of 18 Old 01-10-2014, 10:19 PM
BIGBADWOLF
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Originally Posted by FordExplorer View Post
I replace my cluster for a 2004 model one IDK if this have something to do with .
2004 does not have a oil pressure gage.....it is a dummy that works off of a pressure switch that will move gage to zero if pressure drops below 5 psi. Above 5psi gage reads midscale
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post #4 of 18 Old 01-10-2014, 10:50 PM
Jaspah
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Originally Posted by BIGBADWOLF View Post
2004 does not have a oil pressure gage.....it is a dummy that works off of a pressure switch that will move gage to zero if pressure drops below 5 psi. Above 5psi gage reads midscale
I don't think the cluster controls that. I believe it's related to the plug that actually connects to the oil pressure sending unit having 2 prongs on 2003+, whereas the 2002 or older WJs have 3 prongs.
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post #5 of 18 Old 01-11-2014, 09:57 AM Thread Starter
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Quote:
Originally Posted by Jaspah View Post
The oil pressure sending unit is likely starting to fail. It's non-essential to the engine, very quick and easy to replace, and fairly cheap.

I replaced mine a month or two ago because it would occasionally peg 80 and stay there until it went away by itself or I restarted the engine. Eventually it got worse, to the point where it would just be pegged at 80 indefinitely until I replaced it.
What would happen if i don't fix it? would it cause damage? and what the tool needed to remove the socket ? thank
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post #6 of 18 Old 01-11-2014, 10:18 AM
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What would happen if i don't fix it? would it cause damage? thank
Nothing. Oil pressure gages can drive people nuts....that is why automakers have dumbed them down. In the old days of idiot lights everyone was happy.
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post #7 of 18 Old 01-11-2014, 10:23 AM Thread Starter
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Originally Posted by BIGBADWOLF View Post
Nothing. Oil pressure gages can drive people nuts....that is why automakers have dumbed them down. In the old days of idiot lights everyone was happy.

they don't leak oil when you go bad?
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post #8 of 18 Old 01-11-2014, 01:26 PM
fastfreddie
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Mine does the opposite. Drops to zero and back.
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post #9 of 18 Old 01-11-2014, 01:27 PM
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Mine does the opposite. Drops to zero and back.
What year??
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post #10 of 18 Old 01-11-2014, 02:52 PM
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When it fails it can do either or both. Mine has done both. What can happen is if it starts to seap oil, it can get into the connector and cause it to do weird things when there is nothing overly wrong, per se. Try undoing the connector, and make sure it's clean and dry. If there is oil in it, could be what's causing the issue. You have to be careful if it is seaping oil to the point it's really starting to leak. As well if you break it off, as the plastic can get brittle over time. Remember you need a special socket for it if you replace it.

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post #11 of 18 Old 01-11-2014, 10:53 PM
mdavis83
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It does not take a special socket. Just a fairly big one and deep as well. Can't remember the size off hand but I think it's around a 23mm or so. Maybe bigger. I spent more time getting the red clip out of the plug to pry it off then actually taking the sensor out.
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post #12 of 18 Old 01-11-2014, 11:29 PM
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Originally Posted by BIGBADWOLF View Post
What year??
'02 Overland, 150k miles, original owner.
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post #13 of 18 Old 01-12-2014, 12:09 AM
cykaaro
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Originally Posted by mdavis83 View Post
It does not take a special socket. Just a fairly big one and deep as well. Can't remember the size off hand but I think it's around a 23mm or so. Maybe bigger. I spent more time getting the red clip out of the plug to pry it off then actually taking the sensor out.
There are two different socket sizes available, depending on the sending unit size, but I believe the one in the link is the right size one to use. The oil sender unit socket is specially designed to allow the the plug end of the unit to fit inside straight, and fit on the 'nut' part of the sending unit properly. It is designed differently than a regular socket.

This is the mopar oil sending unit and what it looks like:


And this is the socket that is made to fit it.
http://shop.advanceautoparts.com/web...aft_10051056-p

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post #14 of 18 Old 01-12-2014, 10:17 AM
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Originally Posted by fastfreddie View Post
'02 Overland, 150k miles, original owner.
Have verified head as being a "TUPPY"?
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post #15 of 18 Old 01-12-2014, 03:15 PM
fastfreddie
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How?

All I can tell you, currently, is that it's the original 4.7HO engine purchased Nov., '01.
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