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Jeep Cherokee Grand Cherokee Engine and Performance Problems

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  • jeeepjeeep Posts: 5
    Hi I have a 03 Jeep Grand Cherokee V8 with 31,000 thousand miles
    for the last month I have a vibration at 1,200 - 1,700 RPM 1,500 is more were it dose it the most.
    I feel it in park and racing the engine to that spot and around there and feel it when driving as well at 25, 45, 55, 60 mph and so on anywere the rpm are at 1,500 or so.
    Its not a real big vibration but still fill it. I have took it to the dealer 2 times now. The first time the gave it a 30 thousand mile tune up. It still did it and said its normal. the 2nd time they said it feels like a jeep and feels it a little bit and say its normal nothing wrong. I haven't felt it before and now I am feeling it all the time.
    has any one felt this before or know what it may be? or am I just going nuts, maybe the jeeps driving me nuts
    Thanks for the help.
  • tuggajbtuggajb Posts: 646
    check the fan blades for cracks loose pulley has to be something thar is loose or broken that turns when in park with engine running so take light and with engine off tug and push stuff that turns when engine is on
  • i have a 2000 jgc laredo 4.0 I-6 One day just wouldn't start no warning signs figured out no power getting to fuel pump but couldn't figure out why. I took it to the shop they replaced the crank position sensor. It worked fine for about a week then it started acting like it was running out of gas. It died on me i got it started and drove about a half hour without problems. Eight hours later started fine drove a few minutes did same thing. That happened a few more times until once i just couldn't get it started. It seems no power to fuel pump again. Is there a chance for a bad crank sensor again or is something else causing the crank sensor to go bad? Any help would be greatly appreciated.
  • my 99 is currently doing the same thing. i have replaced the radiator and the thermistat, the temp sensor. did you ever get it figured out :mad: :sick:
  • Hi
    I am looking to see if someone can help me. I have a W reg jeep grand cherokee but recently i have noticed that when you drive of in the cold the revs will stop increasing and he car has no power, feels like something is blocked. you have to accelerate really hard and put your foot down and it will accelerate. But then drives like your pressing and de pressing the accelerator.

    any ideas would be great.
  • Hi I would start with the fuel filter and then go from there.
  • This is a 2WD. It tends to be louder and more frequent during colder temperatures, such as recently in the mornings when the weather has been in the upper 30's/lower 40's. When you press the gas pedal, the sound completely disappears, but when you let off the gas pedal, you hear the noise until you drop down to about 20 mph, then it fades away. Could it be something related to the fuel pump?
  • its funny you say that, im needing that replaced, will try thats, see how it goes.
  • Hi I have the same problem did you find the fix?
  • HI

    I THOUGHT I HAD A FOX, BUT UNFORTUNATELY I DONT. I HAVE IT BOOKED IN AGAIN SEE WHAT HAPPENS.

    IF YOU GET ONE LET ME KNOW

    THANKS
  • I have the same problem with the same car and engine.The dealer ship says :it is the mds system that you feel at low rpm..The fact is that has been aggravated since they change the sparkplug at 58000 miles.
    A lot of complaint about this feeling on the net..I have no idea what to do,but get rid of the car.
  • tuggajbtuggajb Posts: 646
    who changed plugs ? dealer ? did they put in the right plugs ? same as taken out if not get the plugs that are called for (dont let them tell you plat gold etc are better) the computer is set to read voltage drain on the wires to coils and computes firing timing with that reading if wrong voltage is read will fire cyl at wrong time

    years a go when you did a tune up yor reset the timing now days you dont set timing as computer dose all that
  • 4.0L / automatic / 4wd Sport. Starts rough, misses, even at high speed a slight miss is detectable. Code indicates AIS motor. Does this sound correct? This only began when the check engine light came on.
  • Hi
    i would get the head gasket pressured tested, make sure its ok. Secondly check you coil pack and spark plugs.

    see how that goes
  • I would be VERY grateful if anyone could shed some light on my Jeep problem.

    Last week, whilst driving my 2004 53-plate (UK reg.) 4.7 Overland model I noticed wisps of blue oily smoke coming from under the engine. Closer inspection revealed quite a majot oil leak dripping through the mechanicals onto the cat and then boiling - hence the smoke. I limped the car home after topping up the oil only to suffer a boiled-dry cooling system.

    From experience with a different model I fear this might be a sudden headgasket failure but really I have no idea. I cannot drive the car (parked outside my flat here in London). Need to have it flatbed-towed to a garage but before I do, can anyone give me some idea of what might be wrong?

    I have not off-roaded the car for about 6 months and there have been no other problems whatsoever. It has done 60000 miles now.

    Many thanks.
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  • Hi. just recently, my Grand Cherokee has decided it wants to just die while driving down the road. The electronics still work fine through this. The engine just shuts off. If I am moving at the speed limit, iI can usually pump the accelorator a few times, and the engine will start on its own. However, I have been at a stop light, and the thing just dies. I then have to put it in neutral, and turn the ignition. It will not fire up right away, but after a few tries, it will go again. Help would be greatly appreciated, and make impatient drivers behind me happy!
  • jgj2jgj2 Posts: 3
    happened to me in my 2001 and I replaced the crank sensor and now works perfect.
  • This engine runs great except as follows: After reaching normal operating temp, the engine is turned off and the car sits for 20 or 30 minutes. After re-start, the engine misses and backfires during normal acceleration to 30 MPH. I have to feather the gas or rev the motor to clear the problem. After this first acceleration, the engine runs fine. The milage is 110,000 and this problem has been going on as long as I've owned the vehicle (15,000 miles). I recently replaced the plugs, wires, rotor, dist cap, coil and crankshaft position sensor. Any ideas would be great.
  • Well, here's what I think. It's your fuel pump. Just replace it. My reason is that I had one fail on an older car (not a Jeep) and the symptoms were about the same. The car would almost die when climbing hills and then perk up going downhill. I hope this helps. Let me know if this works.
    Jacques G. from Jeep SRT8
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