Last post on Mar 20, 2013 at 10:59 AM
You are in the Jeep Cherokee and Jeep Grand Cherokee
What is this discussion about?
Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Jeep Cherokee, Engine, SUV
#224 of 729 Re: 1999 Jeep Cherokee with no oil pressure when warm or when idling? [dsmans]
Feb 28, 2007 (8:30 am)
I have a 1995 6 cyc w 145k miles and had wide swings in oil pressure when driving and at idle. Pressure sensor internal membrane had tear and needed replacement, now working fine. Oil pressure test at 3k rpm's was fine but at idle was lower then factory spec, meaning some internal oil passage blockage. My mechanic recommended running some oil cleaner/flush thru engine before next oil change to dislodge internal debris which happens in every engine. Once a year this is what he recommends as routine way to keep clean.
#225 of 729 Oil Pressure Sensor
Mar 03, 2007 (7:35 am)
So my oil pressure gauge on my '95 GC was doing much the same as many have posted here. Now I've replaced the sensor and my oil pressure gauge is reading zero - all the time! Do I need to reset a computer or something? Please advise.
#227 of 729 Cherokee Oil Pressure
Mar 12, 2007 (7:43 am)
When I start my 98 Cherokee, the check gauges light comes back on as there is about a 20sec delay before my oil pressure gauge begins to read any pressure. It used to begin reading immediately along with all the other gauges. This behaviour began after my last oil change. Once it begins reading I have normal pressures of 40-50 at speed and as low as 15-20 (warmed up) when idling. What would cause this delay and should I be concerned?
#228 of 729 Re: Jeep GC oil pressure problems [poconojeep]
Mar 25, 2007 (6:37 am)
I am replying because I have the same problem you are talking about. I have a 2000 jeep striaght six and replaced oil sending unit and finally oil pump which was very expensive and I still have the problem. I am looking for any suggestions or solutions. I was also having a problem with loosing radiator fluid. Thanks, Rick.
#229 of 729 Re: Jeep GC oil pressure problems [rnadeau]
Mar 25, 2007 (9:00 am)
I took mine to a dealer about a month ago. It also needed some other work, but I wanted to make sure that there was nothing seriously wrong engine wise before shelling out money for a new radiator and new battery. They were sure the problem was the sensor. So after paying $900 for the sensor, radiator, and battery I drove home only to discover the problem hadn't been fixed. When I took it back the next week they told me the problem was in the engine and quoted me $5000 to replace it, which obviously I wasn't going to do. My Solution: I'm trading it in and leasing a new Nissan XTerra. They gave me $3000 for the trade. Too bad I owe $6000. My guess is the engine they were putting in Cherokees and Grand Cherokees of this era was a complete piece of crap.
#230 of 729 Re: Jeep GC oil pressure problems [poconojeep]
Mar 28, 2007 (2:44 pm)
I have a 2000 Jeep Cherokee Sport, 93,000 miles. I had the same problem with my oil pressure; it's fine when I start up, but after driving for 5 minutes it begins to drop and will drop all the way to zero if I come to a stop. Last week I realized I was also losing coolant. Took the Jeep in for service, mechanic says I have a cracked cylinder head. This is my 3rd Jeep Cherokee, the others ran for 160,000 miles plus (my 99 is still on the road-no problems). I asked the mechanic why this Jeep engine failed since it's been carefully maintained just like my other Jeeps, he said "some of these heads just crack spontaneously". (???)
Does this sound right to anyone?
#231 of 729 Re: Jeep GC oil pressure problems [cbeisser]
Mar 28, 2007 (7:59 pm)
If you check the forum, most of the people having this problem have Cherokees or Grand Cherokees of about the same era. Clearly, whatever engine they were putting in these vehicles was sub-standard. My last Jeep was an 1986 Cherokee Wagoneer that ran forever. It was the reason I bought another. Now, I've got a Nissan.
#232 of 729 2000 Cherokee - oil pressure drop on idle - runs rough
Apr 05, 2007 (7:43 pm)
My wife's 2000 cherokee 4.0L just started experiencing the issue.
Which is strange because a co-worker just had his 2002 cherokee 4.0L have the issue fixed. He went to a dealer. They replaced the sending unit. It was good for a couple of days... then back again. The dealer then replaced the pump at the tune of $450.00+. His issue has not returned in 2 weeks. He also never experienced the engine running rough when the issue occurred.
My wife's vehicle on the other hand was really struggling to keep idling. So, not having alot of cash, I decided to tackle the oil pump.... it is Michigan... 30 degrees and snowing in April.. NICE! I have been under the vehicle so far for about 8 hours across 3 nights. If I had a lift it probably would have taken me maybe 2 hours to get to this point. I am ready to put the new pump in.
That being said, if it gets to the pump replacement stage with you, I would suggest paying the extra $300 to have it done for you.
I will update this when the pump is in to say if it fixed it or not.
At any rate.... We never had the issue until the wife took the Jeep to a Valvoline quick change. The clown over filled the engine. I am guessing two quarts. This allows the oil to be aerated by the crank. Also, to be noted we had used a semi synthetic the oil change before. So, this oil change took us from semi synthetic back to plain oil.... maybe this could pay its part in root causing this issue...
more details to follow....
#233 of 729 Re: 2000 Cherokee - oil pressure drop on idle - runs rough [jc00]
Apr 06, 2007 (3:39 pm)
be sure to prime pump or you will have the same prob you have now
i just fill it with grease befor i put them on