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Unread 10-07-2012, 11:17 PM   #1
pete2003
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Oil pressure gauge ???

I have a 03 Jeep Wrangler Rubicon with the 4.0 motor.
I started it this morning and the oil pressure gauge did not move.
After a few seconds the check gauges light came on and I saw there was no oil pressure, the jeep was running smooth and sounded fine.
I shut the jeep off and checked the oil and it was ok, so I started it again and the light came on again.
I waited for a little bit and tried it again this time the gauge moved but when it did it was jerky. The gauge went over half way and stopped where it normally does but it did not sweep smoothly.
I shut the jeep off and tried it again and the gauge was moving but it was jerky. I made a few trips today and the jeep ran fine except for when you start it and the oil pressure has to build up and the gauge is jerky
Do I have a bad gauge?
Is my oil pump going out?
Has anyone else had this problem?

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Unread 10-08-2012, 05:23 AM   #2
TJJP77
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Only way to be sure is to hook a mechanical gauge to the engine and test it. If the oil pressure is fine on the mechanical gauge, then it's probably the sender, wiring or gauge, but the sender is typically what fails.
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Unread 10-08-2012, 06:26 AM   #3
keith02
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Yup...I agree

I'm a career submarine sailor who navigated the world blind excect for instruments, where I learned the sacred law 'never doubt your instruments'.....but in this case and how you described the failure mode, I would first suspect all suggest above.

Till then, drive it and listen for clacking lifters when you doubt....the top end gets oil last, so it will talk to you.
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Unread 10-08-2012, 06:30 AM   #4
JBTJ
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Mine just started doing that this past saturday. Replaced the sending unit and all is good now.
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Unread 10-08-2012, 09:27 AM   #5
pete2003
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I started it this morning and the gauge came up right away but it was still not smooth.
I will replace the sending unit and see if it fixes the problem thanks for the advice.
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Unread 10-08-2012, 10:06 AM   #6
familyTJ
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I had/still have the same issue in my 97 TJ. Replaced sending unit and gauge would still drop. Put in a mechanical sending unit...pressure was rock solid. Finally discovered it was the instrument cluster wiring harness connection. Greased it up and put it back together and the gauge worked for a couple years and now it's jacked up again.

Just something else to check.
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Unread 10-08-2012, 10:32 AM   #7
Jerry Bransford
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That problem is, nine times out of ten, normally nothing more than a bad oil pressure sender which can be easily and inexpensively replaced in ten minutes.
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Unread 10-08-2012, 12:02 PM   #8
Robert J. yates
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Quote:
Originally Posted by Jerry Bransford View Post
That problem is, nine times out of ten, normally nothing more than a bad oil pressure sender which can be easily and inexpensively replaced in ten minutes.
Agreed Jerry... you don't need to be a submarine sailor to know the odd little quirks about TJ's... especially one that is getting close to 10 years old.
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Unread 10-08-2012, 12:14 PM   #9
mdm
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Quote:
Originally Posted by keith02 View Post
...the sacred law 'never doubt your instruments...
I drove a '50 Chevy truck for over 20 years that didn't have a working speedometer, odometer, or fuel guage. Never got a speeding ticket, and yes, it was capable of speeding. The only time I ran out of fuel was when my wife drove it and didn't tell me.
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Unread 10-08-2012, 01:31 PM   #10
pete2003
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$25 Auto Zone Lifetime warranty
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Unread 10-08-2012, 01:38 PM   #11
Jerry Bransford
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Quote:
Originally Posted by pete2003 View Post
$25 Auto Zone Lifetime warranty
Which unfortunately isn't considered by many as a quality/reliable replacement sender. It took me three trips to Autozone one Sunday when the dealer was closed to finally get an oil pressure sender that worked properly. OE senders/sensors are the only ones I can recommend, most of Autozone's come from China.
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Unread 10-08-2012, 01:50 PM   #12
JBTJ
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Quote:
Originally Posted by pete2003 View Post
$25 Auto Zone Lifetime warranty
And you will need it several times. chinese junk!
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