Question about 1990 Jeep Cherokee Limited

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How do you replace the oil pump in a 1990 jeep cherokee limited ?

It has very low oil pressure when driving or idling

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  • 51 Answers

DROP DOWN YOUR OIL PAN BY UNBOLTING IT THEN TWO MACHINE BOLTS HOLD THE PUMP UP TO THE MOTOR.THIS IS A EASY FIX YOU CAN DO IT.

Posted on Jan 17, 2009

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2 Answers

My 2002 jeep grand cherokee limited is reading low oil pressure but wen i accelerate it goes to middle pressure but then down to low wen i stop wat can be the problem?


Oil pump or other issues
Cam bearings,etc
Bad sending unit

I would put a mechanical oil pressure gauge on it,to verify oil pressure.

Certainly stop driving it ,until you find and repair

Nov 09, 2010 | 2002 Jeep Grand Cherokee

1 Answer

My 1990 Jeep Cherokee Limited idle speed fluctuates up and down..when I am driving at cruising speed the car begins to shake. When I am driving on the freeway above 55mph the car shakes constantly. I...


hey there, artismo here! I have a similar problem with the idle fluctuating, and the trans down shifting itself at light throttle, which is the lock-up in the converter getting the wrong signal ? from the ECM.

Aug 12, 2010 | 1990 Jeep Cherokee Limited

1 Answer

1990 Jeep low miled trailered back from NM noe has idling problems. Fuel pump replaced and more. Any ideas. dies often.


possible change in altitude where you trailered the car to,you may need a tune up or clean the throttle body

Jul 07, 2009 | 1990 Jeep Cherokee Limited

2 Answers

2005 Jeep Grand Cherokee v6 low oil pressure at idle


have a 2000 jeep grand cherokee with 84,000 miles. started having issues with oil pressure gauge going crazy up and down, beeping. had oil pump replaced per mechanics recommendation. didn't help won't hold pressure---only registers about 2. now they tell me i need a new motor!!! just bought vehicle less than 1 yr ago...had carfax clean report!!!!any suggestions?

Apr 17, 2009 | 2002 Jeep Grand Cherokee

1 Answer

1989 jeep cherokee


You need to verify the real oil pressure with a good oil pressure gauge. These are pretty simple gizmoes with a gauge and a hose. Get a hold of one and it screws in where the pressure sender is connected. Most engines need around 45 psi at idle. If it's not OK look for diluted oil, wrong viscosity oil or worse yet worn engine bearing or oil pump.

Mar 24, 2009 | 1989 Jeep Cherokee

1 Answer

Low oil pressure reading 1990 jeep cherokee laredo


If this is a high mileage vehicle, say 180k or higher, treatments are not going to help. As mileage increases, the tolerances and clearances in the mating parts increases. This will lower oil pressure. I have a 90 Safari with 192K. Oil pressure was identicle to yours. I put new rod and main bearings in it and now it never goes below 40 psi, even when hot and idling. I tried additives and all I got was more trouble, It started smoking and using a qt. of oil every 300 MILES. I put valve stems seals in and it helped alittle but not near enough. It is now parked and driven only when have to. This is a result of the previous owner of my vehicle not changing oil at regular intervals and overall poor upkeep of it.

Good Luck

Feb 27, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Wont start!


it is a possibility that the cps is bad. but also check to see if your car has a safety which will shut the car off if the oil pressure drops to low some vehicles have an automatic shutoff to save the engine. have you checked for codes the cps will throw a trouble code if it is bad, usually. check all your basics as well adequate fuel, spark etc. hope this helps some

Feb 14, 2009 | 1990 Jeep Cherokee Limited

3 Answers

Low oil pressure on 99 jeep grand cherokee


change your oil,it could be too thin,see if that fixes it

Jan 17, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Hard start


Check fuel system... filter, pump (do you hear it running) pump relay, Pressure test at fuel rail for pressure retention, running pressure etc, regulator operation. Also make sure IAC valve is clean., EGR valve is operational. With the limited info you have posted, there is a list a mile long of stuff that can cause your problem. Do basic checks such as making sure vacuum hoses are connected & intact & that ign system is functioning properly.
After you have better info, perhaps I can help!!!

Jan 04, 2009 | 1990 Jeep Cherokee Limited

4 Answers

1990 jeep cherokee won't idle


check the ...PVC valve and the MAF sensor.

Aug 24, 2008 | 1990 Jeep Cherokee Limited

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