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Jeep Cherokee Grand Cherokee Engine and Performance Problems



  • I just experienced similar problems with my '93, so I changed electronics plus the fuel filter, with no luck. I bought a fuel pressure kit (hoses/gauges $15 @ auto stores) and found my fuel pressure was off by 50% (data in repair manual $20).

    After testing the fuel regulator (OK), I decided to change the fuel pump. This was no easy job, as my fuel pump is located INSIDE the fuel tank. Don't attempt this without assistance.

    You'll also need a floor jack, 3 ton car stands, upper body strength and lots of caution working around a gas tank! Call local auto stores, salvage or websearch for exact fuel pump match, so you'll need it in your hands. Of course, this means you'll have to take it off the road for these repairs. I used a self-service salvage yard, LKQ, and saved over $250 on the pump.

    The fuel pump has a LARGE plastic securing nut holding it to the tank. Use a wide blade screwdriver and hammer to gently tap it off. Be sure to replace the rubber seal with a new one (Jeep $15).

    I hope there is a solution for you somewhere above.
  • 2004 JGC Laredo 4.0L, 2WD, LHD, MTC, A/C and heating wouldn't turn on; turn signals wouldnt turn on either. Flashers do work, dealership stated that it was an inoperative heater blower motor, blower motor resistor module, and a inop multi-function switch. Replaced all. 10 minutes later, driving away the heater quit (nothing at all, not even cool air) and the turn signals quit also. Still not fixed. Today, the vehicle overheated while running in the opened garage (it is about 30 degree's here). This vehicle has not been run much lately, has NEVER overheated. All I can think of is a power surge or short on the A/C and the turn signals (a fuse was blown, no it's not the fuse). Maybe something electronic on the overheating (its not the thermostat or the pump....). Prior to this, NO ISSUES. Vehicle has about 58,000 miles, is garage kept, and maintained well. I think its an electronic bug somewhere. I know the first two issues are connected and now I think the third has joined the others. I've heard of a lot of issues with the Jeep but this is the first on my three problems (heater wont turn on, A?C; turn signals same, overheating...).
  • My 88 Cherokee 4.0 inline six cylinder, 5 speed manual, loses power when going up a hill whether the hill is a steep one or not. It's much worse at losing power on steep even loses power when downshifting to get more power.
    What could this be?
  • Hey, hope someone can help with this, 1993 Grand Cherokee 318, didn't start from one minute to the next, replaced the fuel filter, we have a good spark, all electrical works, reading the forums it seems to be the crankshaft position sensor which I bought. I found the electrical connector for the sensor by the dist cap, followed the wire to what feels to be the sensor, there is very little room to maneuvre your hand let alone tools, am I missing something ? It seems to be behind the engine block on the passenger side next to the distributor, can't visually see it just feel for it. I removed the passenger side Valve Cover, which is giving me a bit more room, but still can't see it. Am I on the right track ? :confuse:
  • tht828tht828 Posts: 4
    I'm having the same problem with my 2004 4.0 six cylinder. Haven't been able to find source yet either. If you find out the problem please post the cause, & I'll do the same.
  • I have a 2001 Grand Cherokee Laredo and started hearing a very high-pitched sound that occurs when I decel (let off the gas) at speeds above 15 mph. When I press the gas pedal and accelerate, it disappears. It also disappears when I slow down below 20 mph or when sitting idle. It's not metal against metal (such as rotors/brakes) or anything like that. Sounds like a really 10x steam kettle (almost like some type of pressure leak). The sound is louder and more prevalent when engine is cold. Sometimes disappears after driving a while, but other times it doesn't. The check engine light is also on. Took it to Jeep service twice, both times they say the computer is returning and invalid code. However when I took it to Autozone, they had a code that was related to emissions sensor.
    Any suggestions?
  • Took the Jeep to my mechanic, ends up being an intermittent faulty Fuel Pump, started 3 out of 5 times, after doing an entire tune-up. The Fuel Pump is in the Fuel Tank, typical lol :-), the fuel pump costs $ 374.00 (module actually), Oh well, it's running great now
  • I hope you can help me out..I was driving home and the first thing I noticed was that the heat coming out of my vents went cold and seconds later my gages were chirping at me. I pulled off the highway and noticed that both my oil pressure and temp gage were red. I popped the hood and noticed that the coolant was released by the pressure relief valve but that was it. I checked the fan belt - no problem. I waited for a while and then started it back up and went as far as I could until the temp gage came close to the red zone (the oil gage stayed high). I did this several times until I got home. The only other thing I noticed was the engine wouldn't start right away - I had to feather the gas pedal.
  • If you have good spark then the crank sensor is working. Are you checking for spark at the coil or the plug wires. Do you have good fuel pressure? Can you hear the fuel injectors chattering. Can you hear the fuel pump kick on when you turn the key to the on position or when it is cranking over?
  • Hi,
    Your problem sounds very like the one I have with my Jeep a 98/99 Cherokee with all the same suspicions as to symptoms. I have confirmed that it is not fuel pump, regulator or filter by hooking up a pressure gauge inside the car to the fuel rail. It stays at 50 psi when I get the problem. I also confirmed that it is not O2 sensor as this is operating within the expected voltage range. I am not sure whee to go next.

    Did you resolve your issue and if so what was the solution???


    Mike :confuse:
  • xmechxmech Posts: 90
    LOL! Sorry to throw this in here, but I've been lurking many other threads at Edmunds searching for a good mid-size sedan to replace my 2000 Grand Cherokee. One day I decided to see what's up in the Edmunds GC forums, and couldn't believe all the problems listed here!

    I've had 2 door lock actuators go bad, a siezed rear brake caliper, both rear axle seals leak(NEVER off-road), the interior lights mysteriously fade on and off with the alarm set, my water pump goes out October every 2 years, a transmission leak which will probably cost more than the car is worth to fix, and now my oil pressure gauge pegs at max pressure with the engine off... :sick:

    So I found it kind of humorous that they are looking for some 'satisfied' GC drivers. I guess other than the issues, I like my GC other than the MPG, nowadays. I'm sure there are satisfied owners out there, it was just funny to find that comment amongst all the problems. :D
  • tidestertidester Posts: 10,110
    they are looking for some 'satisfied' GC drivers ... it was just funny to find that comment amongst all the problems

    One might conclude that's what would make it newsworthy! ;)

    tidester, host
    SUVs and Smart Shopper
  • -additional info for #465...

    I replaced the water pump and it appears that the temp is under control but my oil pressure is still extremely high. I took it for a test ride and it stalled out after about 3 minutes. Right before it stalled I was having to feather the gas to keep the engine running.
  • xmechxmech Posts: 90
    Does your oil pressure show high with the engine off but the ignition switch on? Might just be a bad sending unit and nothing to do with it running bad.
  • I just checked - with the key in the ignition, the oil reads just above 40, after I start it up it goes up to 70. Early this morning, I let the jeep run in my garage for a while. When I first started it the it up, the engine would rev properly when I step on the gas pedal but after 5 minutes it would bog down when I stepped on the gas and then shoot up....any help?

    I was checking out some other web sites that discussed reasons why the vehicle would stall. A majority of the issues looked to be a bad crank shaft position sensor...
  • After 5 mins, the pressure creeped up to above to apprx. 73.

    I'm worried I might have blown my head gasket when my water pump stopped working (replacing the water pump was close to maxing out my mechanical abilities). Replacing the head gasket does not look easy...
  • xmechxmech Posts: 90
    Wow, head gasket?

    Well, I'm not a car mechanic by trade, but let's start from the beginning:

    What year/engine/miles do you have?

    Have to ask, so don't be offended, just have to know, have you been following the maintenance schedule at least a little? Replaced spark plugs, cap & rotor(if applicable), etc? Just have to ask as I know people who just run their cars until they die and wonder why it doesn't run without oil and such.

    Also, if you suspect a head gasket failure, is the oil milky from water? Or is there oil in the coolant system?

    Oh, and if the oil PSI shows 40 without the engine running you think you can trust it when the engine is running?
  • Hi all,

    My 2002 GC (inline 6) started making ticking and knocking noises about two months ago. Sometimes its a tick, sometimes a knock, and sometimes it sounds fine. I have had it into my mechanic twice and to the Jeep dealer once, but, of course all three times it ran fine. After talking with the service manager at the Jeep dealer, on his advise I changed the oil and added a container of Lucas oil additive. For a week or so after the oil change, there was little if any noise, then the noises gradually became more frequent. Then, several times while sitting at a traffic light, the oil pressure dropped almost to nothing, but promptly went back to normal as soon as I would pull away from the light, other times the oil pressure would remain up at idle. I bought it back to my mechanic (one of those times it would not make any funny sounds); he checked the oil for coolant (it was fine) and changed it, again adding an additive. After that second oil change, again everything was fine for perhaps a week or so, then the ticking started every now and then. Now, about 3 or 4 weeks after that second oil change, the knock comes back sometimes and the oil pressure has started running abnormally high, not high enough to turn on the check gauges light, but much higher than it used to run, almost reaching the "H" while accelerating. The Jeep service manager, my mechanic and two other ex-Jeep mechanics I have talked to are all at a loss as to the cause of the problem. Of course the service manager and the ex-jeep mech. who now has his own repair business both say I should put in a new engine.

    The Jeep has 168K miles on it and otherwise runs fine. Even when making noise there is no apparent loss of power, although, of course, I am treating it gently these days. Any ideas?


  • A bit more info and a question;

    The oil has been changed regularly, although a few times not till about 5K miles after the previous change.

    Does anyone have a thought on having the oil system flushed out. One mechanic recommended this (and, of course the Valvoline folks always suggest it), while others are neutral about it or do not recommend flushing it out.

    And, as for flushing the engine oil system out, how do they do it? I would be reluctant to have it done if it means running the engine with a solvent or chemical in it that thins the oil, but then, I am getting a bit desperate to solve this problem before I have a bearing seize up on me!

    Thanks again,

  • i have a 1997 grand cherokee V8 and i get around 17mpg, i have had the water pump replaced and the ac pump and i now have 200,000 miles on it and it is running great. i have a stroie to tell about this winter, my husband and i live on a mountain side with a pretty steep drive. This winter my husband came home from his job (he drives a 650 ford utility truck fully loaded with all tools and a crane, he was pulling a trailer behind it with his jetta on it and he could not quit make the hill. He decided he wanted me to pull him up a little bit of the hill to get him into our landing, i thought he was crazy, or he wanted to break my jeep. well he hooked up a strap to his truck and my jeep, we through a little gravel under our tires and i put the jeep in 4 low and believe it or not i pulled him and his truck and trailer up the hill and into our landing. The only regret is that we did not video tape it because it would have made a great comercial for jeep. Our camp neighbors could not believe it either they said if they had not been there to see it they would not have believed it. Please keep in mind that this is an older jeep, but it still has the get up and go that jeep is famous for. i just thought that this was amazing and i wanted to share it.

    Thanks : bren :)
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