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Old 11-24-2011, 08:38 PM   #1
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Default Low Oil Pressure at idle

My 98 XJ has 191,000 miles on it, and once the engine is up to operating temperature, my oil pressure drops to a few slivers above zero. Once I give it any gas it will go back to it's usual position between 1 third and halfway, I wonder if this is a sign that the oil pump is failing, there seems to be some oil very slowly creeping out from under the valve cover, so I wonder if that could have an affect as well... Thoughts?
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Old 11-24-2011, 10:42 PM   #2
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Mine does same thing & as far as I can tell it's normal. I never Zero out or clatter & it always go up when I bring rpm's up. Small leak valve cover doubt has anything to do with gauge.
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Old 11-25-2011, 12:17 AM   #3
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The older/the more worn the engine, the larger the clearance on things including the crank, cam and lifters. Oil gets through easier and hence lower pressure. The Jeep gauge is only so reliable, you might want to check it with a mechanical gauge. Also low idle will give lower numbers there. There was a time a guy might just slap in a $10 set of new rod bearing inserts to buy some time. Also I guess sometimes a new pump helps. I really like the 'advanced search" feature on google.
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Old 11-25-2011, 06:39 AM   #4
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DFlintstone is right on. For low oil pressure readings, you must verify it as good data = good decisions.

Get a mechanical gauge on there and then you will know for sure.

The spec for oil pressure for the 4.0 is as follows:

*Not less than 13 psi at HOT idle
*Between 37-75 psi over 1600 rpms
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Old 11-25-2011, 08:18 AM   #5
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While you're looking down around the oil filter area, get the brand name of the oil filter and post it up please.
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Old 11-25-2011, 09:22 AM   #6
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Does the engine still seem to run okay and sound okay when it the oil pressure looks low? My '98 XJ 4.0 engine has had "low" oil pressure at hot idle ever since I got it, around 60k ago. Engine never makes unusual noise. As suggested above, if it's a worry then check the actual pressure with a mechanical gauge to confirm.
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Old 11-26-2011, 01:27 AM   #7
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I used to use WIX and now I am using FRAM 6X and castrol high mileage. The engine pretty much runs as it normally does, at regardless pressure. I could have done google search I suppose.

I could get a mechanical one on there. But if this is something the 4.0 does, I guess I'm not worried. It has been doing this since I own it, sometimes it stays at zero oil pressure when I start it (still warm) until I give it gas, then it's fine.
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Old 11-26-2011, 01:48 AM   #8
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whats the deal with what oil filter is being used?
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Old 11-26-2011, 06:02 AM   #9
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Quote:
Originally Posted by Dan Shook View Post
whats the deal with what oil filter is being used?
Fram is known for having poor anti-drainback valves. This is critical on our Jeeps because the oil filters mount sideway or worse yet, upsid down. This causes your Jeep to start with little or no oil in the filter feeding the bearings air instead of oil. Done repeatedly, bearing damage does occur.
There have also been reports on the different Jeep forums of low oil pressure and the owner's removed the Fram filter, cut it open, and found the internal filtering material unglued and disintegrating.

Check out this link for more info.

http://minimopar.knizefamily.net/oil.../opinions.html
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