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Jeep Cherokee Grand Cherokee Engine and Performance Problems

729 messages,  Last post on Mar 20, 2013 at 10:59 AM

You are in the Jeep Cherokee and Jeep Grand Cherokee Forum.

What is this discussion about? Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Jeep Cherokee, Engine, SUV

Messages Page 66 of 74

#648 of 729 Delay in oil pressure by bvg

Mar 16, 2011 (10:29 pm)

2001 Grand Cherokee 67,000 miles. Florida so really cold weather not an issue. Oil and filter always changed on time
 
If parked on a slight hill with engine end of the vehicle down-hill there is a with 20-30 second delay in rise of oil pressure after starting the vehicle. Guage sits on ZERO and check engine guage lite comes on--no engine noises. Then guage goes up to proper level but sometimes all the way to the highest measurement of the guage (80). Jeep has never done this before. I am concerned about the relatively ling time the engine runs with no oil pressure registering on guage. OIL dipstick after last oil change slightly above full level on level ground with engine cold--Oil change place say this slight over fill is not a problem
 
Does not do this when parked on level ground

#649 of 729 98 Cherokee Sport bucks and lurches by cherokeeguy868

Apr 01, 2011 (8:51 am)

Hi Guys. I've got a question for the mechanical geniuses.
 
My 98 Cherokee Sport hesitates when I back it up. It also starts lurching and bucking on the highway after it's been running for a while. Lastly, it backfires internally if you try to start it up but don't turn the key to the on position for about 30 seconds ahead of time.
 
Any ideas what could be going on? I'm planning a trip cross-country in May and obviously can't take it running like this. I live in a small town and the only "mechanic" within a reasonable drive is a backyard guy.
 
Thanks a lot.
 
John

#650 of 729 #7 Cylinder Code Miss by scootter1

Apr 05, 2011 (8:38 pm)

Hey Everyone,
 
Having problems with my daughters 03 Grand Cherokee 4.7 HO. A few months ago, it would just stop running. Ended up replacing the cam and crank sensor. The engine continued to run rough. Ended up having a #7 cylinder miss fire. Replaced the spark plugs and all was good. Now it came back on the #7 cylinder. Switched coils around and still continued to run bad. The #7 spark plug didn't look bad or smell bad like it wasn't firing cause of spark, but maybe no gas???????
Scott

#651 of 729 2004 grand cherokee L 4.o crank no start by dizee25

May 10, 2011 (7:03 pm)

I have a 2004 4.o six, it cranks no start it will run if gas is poured in, I can hear pump run when key is turned on, I check injector fuse they are ok, I did not get voltage to fuse? what do I check next?

#652 of 729 94' JGC Stalled in flight by b_web

Jun 13, 2011 (10:07 am)

My 1994 6 cyl. 4.0 ltr. JCG, with no problems, died suddenly while getting on to the freeway. It has been in the shop for 2 days and they can not find the problem. They tell me they add fuel directly to the rail and the engine won't start. They also inform me that the spark is very dim. They also informed me that now they cant get power to the fuel pump? Mind you, there were no warning signs and all electrical has been fine. Any help would be greatly appreciated.
 
Thank you,
Brian

#653 of 729 Intermittent Running Rough at Load and Idle by eurekagreg

Jun 18, 2011 (8:36 am)

I have a 1999 jeep grand cherokee with the in line 6 cylinder. The vehicle is intermittently running rough at idle and under load. Under load it will feel sluggish with intermittent surges of power. At idle I notice a little black smoke from the tail pipe and a different smell. The check engine light has come on a couple of times with the P0171 code. The oxygen sensors were recently replaced. It was having a similar problem when I replaced the oxygen sensors but this was a few months back. Any help you can provide is appreciated..

#654 of 729 Lost by tumbasm

Jun 21, 2011 (9:58 pm)

I have a 1996 Jeep Grand Cherokee. There are two problems I am having. My first problem is the car pulls to the right (really strongly) when you hit speeds above 60 mph, I have bought 4 new tires, had an alignment, and replaced the axles, and oiled everything up I am still having the problem. My second problem is when I am stopped at a stop light, and while my foot is on the brake, the car moves forward like it is going to take off even when it is stopped. Can any one help?

#655 of 729 Coil went out now horrible Gas milage? by erikalaine

Jun 22, 2011 (6:02 pm)

Okay so i have a 1993 jeep grand cherokee ltd with a 4.0 straight six my jeep was running rough it has a exhaust leak somewhere but it has had that a long time and never had this bad of gas mileage... So my car started then wouldn't start again after i shut it off so i changed the coil and it ran again and it is running strong but doesn't sound pretty and is getting extremely bad gas mileage my jeep is getting about 35 miles to the quarter tank some days even less i dont know what to do please give me some hints i looked and all the coil wires are hooked up and everything tightly but i dont know what the next step i need help and i can not get the exhaust fixed right now i am broke
Thanks for looking -Erika

#656 of 729 Evaporative System Issues by 02jeepgc28

Jun 29, 2011 (6:46 am)

Hi,
 
Since December 2010, my check engine light has come on five times. I've included below what was done each time at the mechanic.
 
73,797 - P0456 Error Code - Evaporative emission control system leak detected (very small leak) - 11/26/10 - Possible loose gas cap, mechanic tightened and tested cap and reset the OBD.
 
74,102 - P0442 Error Code - Evaporative emission control system leak detected (medium leak) - 12/7/10 - Gas cap tested bad, mechanic replaced the gas cap and reset the OBD.
 
77,718 - P0455 Error Code - Evaporative emission control system leak detected (large leak) - 5/31/11 - Possible loose gas cap, mechanic tightened cap and reset the OBD.
 
77,865 - P0455 Error Code - Evaporative emission control system leak detected (large leak) - 6/10/11 - Mechanic replaced the evaporative vent solenoid (solenoid was clicking loudly on the 11/26/10 date) and the crankcase vent hose (hose was cracked); reset the OBD.
 
78,161 - P0455 Error Code - Evaporative emission control system leak detected (large leak) - 6/21/11 - Mechanic suggested going to the dealer because they have an advanced computer system.
 
My questions:
 
I've researched this on Google and it appears that many have had this issue on different Chrysler vehicles, many with no resolution. My mechanic said he could do a smoke test (pump smoke through the evaporative system) to see if that shows anything, but he said that this can be expensive to track down the problem. The dealer wants $95 just to run diagnostics (which would apply to my estimate to get it fixed, assuming they figure out the problem).
 
Have you heard of this? If so, what have people tried?
Any other suggestions?
 
The mechanic said I could drive with the light on, but this makes me uneasy, especially if I go out of town. I have noticed a decline in gas mileage. Other than that, it may run slightly rough here and there, but overall doesn't seem phased by this issue. I haven't spent a ridiculous amount of money so far, but I'm trying to keep the costs down on this.
 
Thanks!!

#657 of 729 Re: Evaporative System Issues [02jeepgc28] by 02jeepgc28

Jun 29, 2011 (8:38 am)

Replying to: 02jeepgc28 (Jun 29, 2011 6:46 am)
It is a 2002 Jeep GC with almost 79,000 miles. It is the 4.0 I-6 and is two wheel drive.

Messages Page 66 of 74

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