Question about 2001 Jeep Grand Cherokee

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Check oil pressure gague came on and pressure dropped to zero.

This occured at idle. Whe I resumed driving, the pressure went back to 20lbs. The manual said 17 to 20 is normal in city driving and as low as 13 is acceptable in some situations. I took it home and parked it. The oil level is fine. It is a 2001 JGC with the V8. It has about 80,000 miles.

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  • dilberger Jan 20, 2009

    Sorry to take so long to get back to you but we just now got the car fixed. It was the oil sending unit.

  • pauldurdle16 Jan 21, 2009

    Hello,

    I have the same problum,Oil Press is ok at startup for about 15 sec,after that it will go to 0 psi,I am assuming it is the the pressure sending unit,can you confirm this.

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Thanks for the input. but did anybody think about the oil pressure relief valve in the pump,right now the engine is running fine and the oil pressure is at normal,i never changed anything, I,m assuming it,s time for a internal cleaning, how about an engine fush and new 5w30 oil every other month. do you think that will help.


Posted on Jan 25, 2009

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I hate to sat it but you could need a new oil pump. hope this helps you.

Posted on Jan 05, 2009

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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.

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