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Old 04-18-2013, 06:01 PM   #1
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2001 Oil Pressure Gremlin

OK, I'm at the end of my rope. Hope someone out there can throw me a line. 2001 Wrangler - 4.0L 135K miles. When I start in the morning, oil pressure normal (40 psi on dash), as soon as water temp reads 200+ oil pressure caves in to ZERO and "Check Gauges" light comes on. I've changed: Sensor - Harness. I've added a manual oil pressure gauge (thinking maybe the dash sensor was less than wonderful), manual gauge reads just over 25psi when cold and less than 10 when the "Check Gauges" light does it's thing. When the light comes on there is no knocking or any other unpleasant noise coming from the engine, it justs idles normally. I'm guessing I'm going to have to drop the pan and check/change the pump. Anyone have any ideas why this only happens when it gets to normal temp? I'd think if the pump was the problem, it would always be a problem.

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Old 04-18-2013, 06:16 PM   #2
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How old is the oil in it? If it is the pump the problem only exists (for now) when it gets warmer because as the engine warms up so does the oil. Thus making the oil thinner which would make the pump have to pump more volume to keep the pressure up. Lower pressure is normal once the engine has warmed up but not as low as yours.

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Old 04-18-2013, 07:14 PM   #3
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No knock only means no damage done yet.

Don't wait to get this repaired.
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Old 05-05-2013, 08:55 PM   #4
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I have a 98 TJ- my first jeep- My oil pressure will sometimes come up to 20 then 40 but usually sits at 0!! even on cold start- I just replaced my sending unit and thought that fixed until actually driving it. The pressure will come up from time to time but not for very long. I was thinking about changing the rod bearings which it seems I can do if I drop the oil pan but if I need to change the oil pump can I do that at that point as well or do I need to lift out the engine- Ive read both ways--- Please Help!!!
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Old 05-05-2013, 11:44 PM   #5
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Offrd is correct...this is not a wait and see project. There are really no "normals" when talking about Jeeps and their problems, but...
135,000 miles under reasonable maintenance and operating conditions shouldn't have a pump failure, but it can happen. You have to drop the pan anyway to check out the pump, I'd pop a couple rod caps and look closely at the bearing surfaces. If they look edgy, I'd pop a couple main caps as well. If those are questionable, it may be time for a rebuild.

There is no way to see any damage or wear on the cam bearings without disassembly. Remember that the oil system feeds the cam bearings first and the pressure sending unit taps into that feed galley....so the wear inside the oiling system may be more than just the pump or the bottom end. Good luck.
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Old 05-06-2013, 01:12 AM   #6
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Awesome, thanks.
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Old 08-30-2013, 11:36 PM   #7
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I have a similar problem 40 cold start and while driving then as it warms up it drops to about 20 sometimes less never been to 0 though my guess is the sending unit for one major reason

Never in my life have I had a pump come and go when I needed to replace it it was cause it was gone

As for why the sending unit didn't fix your problem did you get it from autozone or some other parts store? I have had the problem with aftermarket parts before including a sending unit that just didn't work

Just put one in my buddies zj had to go back three times cause the first didn't read right the second read backwards and the third worked fine he has been driving for a month no no problems

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