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Old 04-13-2011, 09:45 PM   #1
Join Date: Aug 2010
Location: Shippensburg, Pa
Posts: 46
Question Oil Pressure Issue, sending unit already replaced

Ok, so I am having issues with the oil pressure on the jeep. It is a 98 TJ with the 2.5L engine. Here is what has happened.
When we got it, the oil pressure would drop down to nothing and the check guages light would come on. Took it to the shop and they replaced the sending unit. They put the monitor on it and verified there was constant oil pressure.
Since the sending unit was changed, the truck will go up to around 40 psi on the initial start. The longer you run the vehicle, the lower the pressure goes. AFter running for about 30 minutes, the guage reads a constant 0 and the check guages light stays on. The temperature does not rise and it runs around 200 degrees.
Any ideas on what might be wrong? As I said before, the sending unit has been replaced, I have checked the oil level, etc. I don't think it is the oil pump but I am not sure what it might be. Could it be a sensor or the guage itself?

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Old 04-13-2011, 09:57 PM   #2
Benjamen's Avatar
Join Date: Mar 2011
Location: Carroll County VA
Posts: 162
Check your oil and see if there is a metallic tint to it if there is then the chances are your engine bearings have gone bad, If not that then def change your sensor next.

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Old 04-13-2011, 10:12 PM   #3
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Join Date: Feb 2011
Location: East Texas
Posts: 427
Use a mechanical gauge or have a shop check the pressure with a mechanical gauge. If you still are getting a zero reading then you have real problems.

Good luck!!
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Old 04-13-2011, 10:20 PM   #4
Join Date: Feb 2011
Location: Ashland city TN
Posts: 44
Possibly the new sending unit is defective from the factory I chased a problem on a full size bronce once and it was a bad map sensor Wich was the first part I changed out never know sometimes its the obvious we over look. Good luck!
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