Question about 2002 Jeep Wrangler

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No Oil PSI showing on gaugee But Jeep is running fine?

I Have a 2002 Jeep Wrangler and was driving down the rd when the gauge went to Zero. Not over heating or knocking

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  • gables2 Jan 02, 2009



    +Yes Oil level is fine no smoking or Knocking Where is the oil sending at

  • gables2 Jan 02, 2009

    Where do I check PSI

  • Roberta Smith
    Roberta Smith May 11, 2010

    unless the sending unit has stopped working... or the guage... you will hear knocking soon enough... have you checked the level of oil in the engine yet ?



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2004 Jeep Wrangler Problem solved (low oil pressure at idle)

These are the steps to identifying the oil pressure issue

1. Check the oil pressure guage
- this is an easy test to preform by grounding out the single wire from the oil pressure sensor and confirming the gague adjust appropriatley. (With the wire grounded out it should show no oil pressure.) Take the wire off ground should show normal pressure.
2. Change the oil pressure sending usint (15.00$) from the dealer. (cheap way to eliminate a possible sensor issue).
3. Manually hook up an oil pressure gague and check the oil pressure.
Make sure the engine is at operating temperature when checking as it can have a significant impact on the reading.
(I bought a oil pressure guage for 19.00$ online that works perfect. Comes with everything you need to check the OIL pressure at a resonable price.)

Operating pressure should be from 15psi to 60psi. During idle at normal temperature Oil Presure should not be below 15psi.

MY problem: (Oil pressure gugage was droping/ fluctuating at idle) was determined that the oil pump was bad after following the steps above (My readings where 3psi at idle at running temperature. I replaced the oil pump. (only use a Melling Oil pump do not use any other brand I am not a sales person for Melling but is prefered by me and many others that I have spoke with as a soild reliable inexpensive solution 40$-50$). After I changed the oil pump It was determined that Chrysler has installed an alluminium oil pump which had significant wear at only 98,000 miles that had caused it's poor performance. I am not a fan of allumnium oil pumps. How ever it supplied just enough pressure to keep the lifters from clapping so I got luckly and was able to catch the issue before the pump failed leading to bigger problems. After the oil pump was replaced my Oil Pressure is 18psi at idle. If you have to go this far internaly go ahead and spend the extra time to check the Main bearrings for any potential wear issues that could also cause low oil pressure. If you don't want to check all of them at least make sure you check the thrust bearing for any wear as this is a crucial area. All of this can be done by droping the oil pan. (You have to drop the skid plate, exhaust and starter.) It took me and a friend about 5 hours to do everything in the drive way.

This all based off my experience and I am no way an expert. How ever I do not take into consideration lack of maintenace and sludge build up from not properly changing the oil every 3000 to 4000 miles. If you have a sludge issues you should maybe sell or get rid of the vehicle as there could be all sorts of issues from the cam bearing to main bearings to a restricted pick up tube.

Posted on Feb 16, 2009

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I believe it is located near your oil filter... the other expert makes a valid point as well... have the oil pressure checked
there is a chance the oil pump has failed too

Posted on Jan 02, 2009

  • Roberta Smith
    Roberta Smith Jan 02, 2009

    if i remember right... the pressure guage actually screws into the hole that the sending unit is in... you remove the sending unit first of course



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MOST LIKLEY YOU OIL SENDING UNIT WENT BAD/SHORTED. BUT SUGGEST CHECK OIL PRESSURE, TO BE SAFE

Posted on Jan 02, 2009

  • JOSE MARRERO
    JOSE MARRERO Jan 02, 2009

    SENDING UNIT USUALLY IS NEXT TO THE OIL FILTER. TO CHECK PRESSURE , YOU NEED AND EXTERNAL OIL PRESSURE GAUGE. LET A MECHANIC DUE THAT FOR YOU. BUT REPLACE SENDING UNIT FIRST AND IF GAUGE WORKS YOU GOOD TO GO

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I have an 02 wrangler and the oil preasure goes down when Idling is that an oil pump going bad?


First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

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1 Answer

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If you have the correct pressure I would replace the sending unit first.

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2002 jeep wrangler oil pressure gauge drops


When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!

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Have a shop verify the pressure is really low, it could just be the sending unit is defective for the oil press guage, but get it checked, if it really low you could burn out the bearing in your engine, a very costly repair.

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