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Old 01-07-2010, 06:36 PM   #1
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Oil Pressure Drops to 0 when Idle

I have a 2000 wrangler, 135K mi. I was driving it home from the mountains, stopped at a light, and the oil pressure dropped to almost 0 and the check gauges light came on. When i started driving again, pressure went back up to almost normal, but would drop any time it idled. Dropped it off at the shop at home. They checked gauge, sensor, and manually tested oil pressure and they say it sitll drops in idle. Any ideas on what else it may be?

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Old 01-07-2010, 07:49 PM   #2
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So they connected a manual oil pressure gauge to the port and it confirmed 0 oil pressure at idle? If that's the case, my first guess barring something more serious would be nothing more than a bad oil pump or oil pump drive gear.

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Old 01-07-2010, 08:10 PM   #3
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You might think I'm full of crap but this was my deal. My XJs 4.0 had about 150,000 or so when my gage did just as you describe. I replaced the sending unit, no luck. I replaced the oil pump(pain in the butt), no luck. I thought, "What the hell?" Then I read somewhere on some forum to try a Napa Gold oil filter. ? At this point I'd try anything. It worked! I wish I had tried that first. I know, it sounds crazy. If all else fails, try it.
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Old 01-08-2010, 02:07 PM   #4
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I have had oil pump relieve valve get trash under valve and oil pickup get parcal stop up for low oil presser. I would try what JeepnJim suggested try filter first and were oil filter screws on try cleaning with brake cleaner oil pickup pipe to start with.
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Old 01-08-2010, 02:13 PM   #5
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My first guess would be oil filter. I fixed a similar problem on my racecar by replacing the filter. Good luck!
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Old 01-12-2010, 06:46 PM   #6
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Mine did the same thing, I switched to a slightly heavier weight oil and got the higher mileage oil and it hasn't done it to me since. If your still running regular oil, give the high mileage a try. I have about the same mileage as yours.

I replaced the sending unit like mentioned above first and it didn't help.
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Old 01-19-2010, 05:43 PM   #7
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Thanks for the feedback. The shop took off the oil pan, and found the screen was totally clogged. The pan was really gunky too. It is all back together now, I gave them a Napa Gold filter to put on it too. My oil has never been so clean. I am supposed to get an oil sample analyzed in a month to see how clean it remains and if coolant is leaking into the oil somewhere.
The oil gauge used to stay at 40 all the time, but now it is about 45 and drops to about 15 in idle sometimes.
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Old 01-19-2010, 06:12 PM   #8
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Sounds like your engine needs its oil changed more regularly.
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Old 01-19-2010, 06:21 PM   #9
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Actually i've always changed the oil a lot. Every 1500-2500 miles. Never went over.
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Old 01-19-2010, 06:48 PM   #10
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I'm glad that you got it fixed without too much trouble. I only change my oil every 5,000miles along with tire rotation. I know that some conditions require more frequent changes but that's my routine lately.
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Old 08-06-2012, 10:28 PM   #11
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I'm having the same problem 24Jeep was having. Taking the Jeep in to the shop tomorrow and I'll pass along the filter idea. Thanks for the post.
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Old 08-08-2012, 08:23 PM   #12
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the factory idle pressure in the service book is 20(normal) and a min idle pressure on a hot engine of 13psi and normal driving psi between 40 and 60.
and you will often start to get a tick in the motor when it is time to drop the oil pan and do some cleaning of the pick up screen .
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Old 09-24-2012, 03:55 PM   #13
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I changed the sending unit b/c my mechanic was convinced it was the problem, wrong!
He reported the pressure was normal with the tests he ran. Now the gauge always sits on '0'. I'm going to get my oil changed today with the Napa Gold filter and see if that does it.
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Old 09-24-2012, 06:35 PM   #14
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It didn't work...
I'm gonna leave well enough alone. If the pump fails then so be it. I would buy a new Jeep before I put a new pump in a 17 y/o Wrangler.
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Old 09-24-2012, 07:26 PM   #15
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Of the oil pressure is fine, isn't it just a problem with the gauge?
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Old 09-24-2012, 08:45 PM   #16
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Quote:
Originally Posted by 24jeep View Post
Thanks for the feedback. The shop took off the oil pan, and found the screen was totally clogged. The pan was really gunky too. It is all back together now, I gave them a Napa Gold filter to put on it too. My oil has never been so clean. I am supposed to get an oil sample analyzed in a month to see how clean it remains and if coolant is leaking into the oil somewhere.
The oil gauge used to stay at 40 all the time, but now it is about 45 and drops to about 15 in idle sometimes.

My first question would have been, what was the stuff in the oil pump screen?
Not likely it was a bad filter, if it was a bad filter it would have had to be pumped thru the bearings journals.

Second would be, if they dropped the pan, could you please "Plasti-Gauge" the rods and mains give me some tolerances, if they are wide, replace the bearings and pump. The new pump would have tight clearances and a new pressure relief.
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Old 09-25-2012, 07:33 AM   #17
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My 2000 TJ did that...put in a new oil sending unit...okay since.
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Old 09-25-2012, 11:19 PM   #18
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Quote:
Originally Posted by rumblehawk View Post
My 2000 TJ did that...put in a new oil sending unit...okay since.
I just bought my 2000 last night, had the problem on the drive home, and fixed it tonight with a new sending unit.

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