Question about 2002 Jeep Wrangler

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Oil pressure for my jeep 2002 wrangler

The oil pressure seems to fluctuate when at idle. Normally the needle read about in the middle but when Idling in goes to about three quarters, is this normal?

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  • jdhuyvetters Apr 22, 2009

    Thanks I will give it a try

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  • Jeep Master
  • 6,982 Answers

As long as it's not going down, and the engine isnt knocking, you do not have a terrible problem. I have used marvel oil in ones that do this and most times it clears up. If not, change the pressure switch. (Takes a few days before it get's better with mm oil)

Posted on Apr 22, 2009

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1 Answer

1997 Jeep Cherokee Sport hard to start after its warm and fluctuating oil pressure


Hi there:
It sounds like it could be oil pressure sending unit. I would check the connection on the sending unit. Below are the procedures for checking the sending unit, If it checks out good I would have a mechanical gauge set up to measure the pressure.

TESTINGTo test the normally closed oil lamp circuit, disengage the locking connector and measure the resistance between the switch terminal (terminal for the wire to the warning lamp) and the metal housing. The ohmmeter should read 0 ohms.To test the sending unit, measure the resistance between the sending unit terminal and the metal housing. The ohmmeter should read an open circuit (infinite resistance).Start the engine.Once again, test each terminal against the metal housing:The oil switch terminal-to-housing circuit should read an open circuit if there is oil pressure present.The sending unit-to-housing circuit should read between 15-80 ohms, depending on the engine speed, oil temperature and oil viscosity.To test the oil pressure sender only, rev the engine and watch the ohms reading, which should fluctuate slightly (within the range of 15-80 ohms) as rpm increases.If the above results were not obtained, replace the sending unit/switch with a new one.

Hope helps.

Mar 23, 2012 | 1997 Jeep Grand Cherokee

1 Answer

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.

Oct 16, 2010 | 2002 Jeep Wrangler

1 Answer

Oil pressure gauge not reading on my 1994 jeep wrangler. oil is full just the guage has no pressure and not alot of power


The oil pressure specification for your engine is 13 PSI at idle hot, 37 to 75 PSI at engine RPM higher than 1600. I suspect your oil pressure gauge sender unit or gauge is inaccurate. I would have a known accurate mechanical oil pressure gauge temporarily screwed into the present oil sender unit to verify actual pressure.

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

Sep 23, 2009 | 1994 Jeep Wrangler

1 Answer

Describe your 1997 Jeep Wrangler 1997 jeep wrangler 4 cyl idle fluctuates 900 rpm to 400 rpm after warmup no service engine light but check guages light comes on momentarily when rpm gets low and oil press...


The check gauges light is normal because at 400 rpm it isn't running fast enough to build sufficient oil pressure. I am guessing maybe a vaccum leak???

Jul 10, 2009 | 1997 Jeep Wrangler

1 Answer

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!

May 30, 2009 | 2002 Jeep Wrangler

3 Answers

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


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.

Jan 02, 2009 | 2002 Jeep Wrangler

2 Answers

Oil pressure drops at idle


If there is no engine noise associated with this ow oil press reading then replace the oil pressure sending unit on the engine, it is defective, this is common on all cars.

Dec 18, 2008 | 2002 Jeep Liberty

1 Answer

97 wrangler oil pressure drops when engine is at idle


check the engine oil level... you could possibly need to replace the oil pump soon... if you do not live in a cold climate i would consider using 30 or 50 weight oil. do NOT use that in a cold climate as the oil is like molasses when it gets cold.
that's only temporary. one other thing to consider is a clogged oil filter... when was the last time it was changed ?

Robert

Dec 17, 2008 | 2002 Jeep Liberty

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