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