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oil pressure

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Old 10-17-2013 | 05:41 PM
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Dean 423's Avatar
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Year: 1998
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Engine: 4.0
Default oil pressure

got no reading at the gauge, but oil flow up to the rockers,with the fill cap off I can see it coming out the push rod , filling the pivot.runs and sounds same as always.I tried a new sender with same result.I did not see any oil coming out the thread when I changed the sender, this I did not like.The filter is also filling with oil, because I checked that also. I also changed the oil and filter.which I always do anyway.
Old 10-17-2013 | 06:27 PM
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Next step: Make sure the oil tract is not plugged up - a careful poking with a long pointed gismo of your choice and then screw on a manual oil pressure gauge and report back.
Old 10-17-2013 | 07:04 PM
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Verify, Verify, Verify!!! Like Kalali said install a mechanical pressure gauge to see what kind of pressure you actually have. Also like Kalali said check the little ports the that go to the pressure sending unit and make sure that they are not plugged.
Old 10-17-2013 | 07:08 PM
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Also, what brand sending unit did you get? If you got one from auto zone or advanced auto, there is a good chance that it just won't work. Been there, done that.
Old 10-17-2013 | 07:09 PM
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ok thanks.!
Old 10-17-2013 | 07:14 PM
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I might just add that I am an auto tech myself with 32+ years of wrenching,I have never seen this type of conditions but anything is possible! thanks again.
Old 10-17-2013 | 07:16 PM
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some jobber brand could be junk.
Old 10-17-2013 | 07:26 PM
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Originally Posted by Dean 423
I might just add that I am an auto tech myself with 32+ years of wrenching,I have never seen this type of conditions but anything is possible! thanks again.
It is a pretty common problem on our 4.0's
Originally Posted by Dean 423
some jobber brand could be junk.
The oil sending unit on the 4.0 are really not very accurate and any of the after market ones are much worse. The OEM do read much better then the after market ones.
Old 10-17-2013 | 07:45 PM
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Originally Posted by EagleXJ
Also, what brand sending unit did you get? If you got one from auto zone or advanced auto, there is a good chance that it just won't work. Been there, done that.

Mine didn't last a yr. I guess it was under warrant but didn't bother. Just went got one from MOPAR.
Old 10-17-2013 | 08:21 PM
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Thanks guys-
Old 10-17-2013 | 09:20 PM
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Mine was replaced by the PO, gauge reads from 70 to 80 when running. LOL Proof that the aftermarkets are S-H-I-T. I'll replace it eventually but for now as long as it moves I know I have pressure.


Black89
Old 10-17-2013 | 09:39 PM
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There should be a oil dribble when you pull the sender,I have nothing.clog idea sounds possible, but anything is.
Old 10-17-2013 | 09:50 PM
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Originally Posted by Dean 423
There should be a oil dribble when you pull the sender,I have nothing.clog idea sounds possible, but anything is.
OK try this. Get a rubber hose about a 1' 1/2 long and put it in the hole where the sending unit screwed into, now take a few good deep breaths and then grab the hose, put it in your mouth and suck! It may take a couple good tugs but don't be shy suck on that hose till the blockage clears. But for gods sake don't swallow when that chunk of motor sludge breaks free!!!



I'm sorry but with all the newbs tonight asking questions I couldn't resist. Please don't attempt the above just get a stiff wire and see if you can push it in there and clean the passage out. You could pop the coil wire off then with the sender out and tap the key a few times to see if you get any oil shooting out of the hole after you (sorry for saying ) "probe it". If you get a good shot out the hole you should be good other than maybe a bad sending unit.

Black89
Old 10-18-2013 | 06:20 AM
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i will try it tonight. once again thanks guys!
Old 10-18-2013 | 06:42 AM
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Read this Dean:



http://www.jeepforum.com/forum/f19/4...fixed-1304679/


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