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Jeep Cherokee Grand Cherokee Engine and Performance Problems



  • agallmanagallman Posts: 6
    Did you ever see any smoke/steam from the tailpipe, or signs of oil leaking from underneath the engine area? I've read that smoke/steam is a sure sign of a headgasket problem. However, I haven't seen any smoke/steam from my tailpipe, but there is some oil coming from somewhere. I also found a crack in my radiator.
  • bvgbvg Posts: 1
    edited March 2011
    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
  • 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.

  • scootter1scootter1 Posts: 23
    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???????
  • dizee25dizee25 Posts: 1
    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?
  • b_webb_web Posts: 4
    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,
  • 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..
  • tumbasmtumbasm Posts: 2
    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?
  • 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
  • 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.

  • It is a 2002 Jeep GC with almost 79,000 miles. It is the 4.0 I-6 and is two wheel drive.
  • sheenancsheenanc Posts: 1
    My '99 Jeep just cuts off while going down the road. I have replaced the fuel pump twice, but nothing has changed. It happens intermittently. Sometimes it starts right up and then it sets for hours without cranking. I went for a 6 hour trip with no problems, but then a 5 mile trip it may happen twice.
  • That's odd. I haven't had any issues (that I know of) with my fuel pump yet, but I did notice that my exhaust smells rich, which I think is tied to the engine error code. Seems like a lot of people have had fuel/evaporative/emissions related issues. Thanks.
  • Ok 1st off let me start by saying I am not mechanically inclined at all. I am a single mother of 4 small boys and not alot of money to take to shop. These are my issues,
    ABS light is on all the time.
    When you start the car it revs up so loud and high
    When u first start driving it is sluggish.
    When driving it seems to have a hard time shifting gears,
    it is automatic, i let off gas and it kicks in.
    When I put it from park to drive it clunks.
    When I make a turn to like park it clunks.
    And last but not least there is a constant sound coming from like down by brake pedal and accelerator like a constant hiss or air flow. Please help!!!
  • none43none43 Posts: 1
    I have the very exact same problem you find a solution yet?
  • badjeep95badjeep95 Posts: 1
    yes i am having the same problem....when i come off a stop sign goin about 20-25 mph it starts jerking if you find the problem please let me know...its very irritating.
  • cjplayercjplayer Posts: 3
    My guess why your Jeep shuts off is either the cam shaft positioning sensor or the crank shaft positioning sensor, that is if Jeep has either of the two. If your Jeep has a way to display the trouble codes I'd try to find out how to get it to display those codes in order to see if it can identify this as the problem.
  • cjplayercjplayer Posts: 3
    It sounds like you may have an oxygen sensor gone bad. I would try to find the trouble codes to see if they identify the oxygen / or o2 sensor/s as the problem. The oxygen / o2 sensor/s has allot to do with your fuel economy as it tells your Jeeps computer how much fuel to deliver to the injectors. Some of your local discount auto parts stores may check your codes for free, and as for the exhaust smell, I'd run it by a local muffler shop to get my catalytic converter checked to see If It's clogged, this should also be a free service. I just hope It's not an exhaust manifold gasket. By the way your oxygen sensor/s are located on your exhaust manifold / and tailpipe system.
  • cjplayercjplayer Posts: 3
    I would start with your TPS or throttle positioning sensor located next to your throttle body.
    Then your camshaft positioning sensor, and next your crankcase positioning sensor. I'd do one every pay day to see It the problem gets rectified. If not the problem,,,then time to have it diagnosed or pull the codes yourself.
  • cskicski West Springfield, VAPosts: 1,179
    Yeah, I just got mine out of the shop yesterday(99 Laredo 4.7 4x4 135k).

    Mine was trying to stall when stopping at lights for example. The key here with the four O2 sensors is if the rough idle symptoms I was describing happen while in neutral. If the WJ runs rough with or w.o the tranny engaged it is most likely an O2 sensor issue, or the IAC motor pintle, or the cam position sensor. It all hinges on the error codes like u said. Just thought I would throw this in since it is fresh in my mind.
    The loud roaring noise is the coolant system fan clutch engaging on startup. It needs to be replaced, but if you rev it in neutral it will shut off. FYI.
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