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Unread 01-13-2013, 09:15 AM   #1
bcusstc
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Oil Pressure gauge is pegged

Just like the title states, i have a pegged out oil gauge. When i turn the key it just climbs to past 80. When i turn the key off, it slowly descends. I have unplugged the the oil sending unit to see if the gauge would fall but it dont..What are your thoughts?

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Unread 01-13-2013, 09:47 AM   #2
HanksRide
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Not an electrical expert here but have a friend that had the same thing happen on his XJ and it was the sending unit. I am guessing here but I would think that if you unplug it then it may show pegged since it is not getting any signal to tell it otherwise.

We replaced his sending unit and fixed the problem. It is really common on the XJ's with the 4.0L so I figure it may be common on YJ's as well. I think it was about $50.00 at O'Reilly's.
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Unread 01-13-2013, 10:06 AM   #3
zte87
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Yeah toss a new oil pressure sending unit problem solved!
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Unread 01-13-2013, 10:44 AM   #4
bcusstc
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So i could spend 50 on a sending unit or spend 30 on a mechanical gauge and have piece of mind. Are there any other ways to test it?
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Unread 01-13-2013, 10:49 AM   #5
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Quote:
Originally Posted by bcusstc
So i could spend 50 on a sending unit or spend 30 on a mechanical gauge and have piece of mind. Are there any other ways to test it?
I think I only paid 30 for my sensor, and the only bad thing with the mechanical gauge is you would have a dead gauge in you dash!
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Unread 01-13-2013, 10:55 AM   #6
bcusstc
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Originally Posted by zte87 View Post
I think I only paid 30 for my sensor, and the only bad thing with the mechanical gauge is you would have a dead gauge in you dash!
I would just end up replacing the one in the dash with an aftermarket one and some ingenuity
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Unread 01-13-2013, 11:14 AM   #7
fisyac
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Is there a write up on replacing sensor or sending unit
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Unread 01-13-2013, 12:28 PM   #8
bcusstc
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Next to the distributor
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Unread 01-13-2013, 12:45 PM   #9
Old4X
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You can test the gauge. Look up the resistance range of the sending unit and use some resistors to ground and see if the gauge reads properly.

Have you pulled the panel and cleaned the corrosion of the ribbon connector and PC board and gauge connectors yet?
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Unread 01-13-2013, 02:33 PM   #10
bcusstc
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You can test the gauge. Look up the resistance range of the sending unit and use some resistors to ground and see if the gauge reads properly.

Have you pulled the panel and cleaned the corrosion of the ribbon connector and PC board and gauge connectors yet?
Yea i have pulled the gauge cluster and cleaned up all the ribbons and connections, truth is that they didnt even look that bad.
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Unread 01-13-2013, 04:01 PM   #11
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Changing sending unit is a 5 min job, located right above the oil filter, just unplug wires unscrew old one and screw new one in and plug wires back up. That would be a lot simpler and you should have your original gauge working again.
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Unread 01-13-2013, 04:19 PM   #12
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If you remove the plug from the sender unit, the gauge should drop to zero. As you've tried this, and it stayed at maximum, I'm thinking you have a shorted wire, or were unsuccessful in cleaning all the corrosion from the gauge cluster.
I have a '99 with the same problem, and mine goes to 0. CJtim states you should only use OEM's for these. I'm waiting a quote. Regardless, I'm not going to pay more than 40 for it.

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Unread 01-19-2013, 02:14 PM   #13
bcusstc
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Just to Finish off this thread...I broke down and just bought a sender and the gauge worked...I never doubted anyone for a second. That being said, can a bad sender cause a leak?
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Unread 01-19-2013, 03:11 PM   #14
Old4X
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Quote:
Originally Posted by bcusstc View Post
That being said, can a bad sender cause a leak?
Absolutely!
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