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Jeep Grand Cherokee



  • We just bought a 2005 Jeep Cherokee Limited with the Hemi. The owners manual recommends burning regular or mid-grade but not premium. Considering the price of premium, this sounds too good to be true. What you say. In addition, we have just gone thru our 1st tank of gas and averaged 13.8 mpg. Will this go up over time and will burning regular bring that number down.
  • tloke1tloke1 Posts: 185
    Use ONLY the stock Champion plug (4.0= Mopar P/N SP000ZFR5N). Anything else is a waste of money, will NOT offer better performance, and as you found out may cause problems.

    P.S. Find someone else to work on your Jeep, your brother-in-law obviously has no idea what he is doing...
  • I have a 98 JGC, 6 cy. w/83,000 miles. I've only had it for a couple months now and I have a few questions that hopefully someone can answer. The first question deals with some of the optional items that can be turned on. In the manual it says that options such as the lights turn on when the wipers are on and horn beeps when the doors locks can be turned on by authorized dealers. Is there a way for me to manually doing this without going to a dealer and having to pay them?

    My other question deals with the 4wd system (select trac). This is my first vehicle I have owned that has 4wd. I'm not too familiar with how to operate the whole system. When shifting from 2wd to 4 full time do I have to have the transmission in neutral? How about when I shift from 4 fulltime back to 2wd? I don't want to goof around with it until I now what I'm doing. Thanks for any help.
  • naatz1naatz1 Posts: 188
    I am a big Champion plug believer. But I put Bosch double platinums (2 prong, not the 4s) in my 01 Laredo six cylinder last March. I noticed a 5-10% improvement in gas mileage this past summer for no other reason .... again, I won't credit the plugs but I don't know what else it would be either. The Jeep has 60,000+ miles so it's well broken in. It runs fine, at least during the warmer months. Again, no digs on Champion as they make good products but the Bosch do just fine by me (and if in doubt, changing plugs on the old growly reliable 6 is about as easy as any vehicle I have ever owned ... a 30 minute operation for all plugs).
  • Is Employee Pricing ending on September 6th?
    Is Chrysler offering an additional $1,000 on top of the $2,000 cash back if you finance through them? Dodge is, and the rate you get is higher than the 0% APR, but I'll take $3000 and 5% APR over 0% APR and $0 cash back.
    What is going to happen when EP pricing ends? Will prices increase or will we start to see end of the year clearance prices that are the same or lower than EP pricing?

  • tloke1tloke1 Posts: 185
    If a "5%-10%" mileage gain could be achieved by simply using a "performance" plug every car coming off of the assembly lines would have them, and people would be lined up outside auto stores to buy them. There is no such thing as a plug that offers "better mileage" or "more power" when compared to the stock plugs. Your "mileage gain" is most likely attributed to comparing what you were getting with the old plugs to what you were getting with the brand new ones. The results would have been the same had you used stock Champion plugs instead of the Bosch.
  • erickplerickpl Posts: 2,735
    I agree about the bolt on efficiencies. BUT, if you do what you can to keep your engine as tuned as possible, you may not waste as much gas and it will see those 'savings'.

    I've also noticed that the Jeep gets better mileage with the top and doors on (better air flow I guess).

  • Where is the Jeep corporate intelligence? Given the ridiculous price of gasoline, why is Jeep coming out with the SRT-8 instead of immediately announcing that it will sell the European Jeep Diesel model here? C'mon, wake up, Jeep!
  • blkhemiblkhemi Posts: 1,717
    Depending on your driving style ( city/highway-cruiser/leadfoot), you should see that mpg go up about 1-2 gallons realistically speaking in real world terms. I know exactly what you are going through as I just bought my 2005 Hemi a month ago. As for burning regular, at the most you'd see is a slight power lost.

  • blkhemiblkhemi Posts: 1,717
    I beg to differ with your comment. I too have installed Bosch plugs (+4, not +2) and have seen dramatic increases in power delivery, driveability, and fuel economy. I've got a 6-cylinder 01 Laredo with only 22,890 miles on it, so the plugs were not bad at all. On top of that to prove my theory, I had the truck put on th dyno, and found it to have 9 additional horses, and 11 more pound feet of torque
  • blkhemiblkhemi Posts: 1,717
    10w-30 mate! Since the truck is older I recommend going full sunthetic (Mobil 1 preferrably). I've got a '98 4.0 with right at 220k miles on original motor burning synthetic since I bought in '99 with 32,000 miles on the odo.
  • I purchased a 2005 JGC and it has stalled 4 times now. I am looking into my State's Lemon Laws bought thought you could share some advice on how you were able to get Chrysler to buy it back.
  • tloke1tloke1 Posts: 185
    The factory plugs are spec'd for 30k and 23k miles is 75% through that cycle. You're still comparing plugs with 23k miles to brand new plugs, apples and oranges. The Bosch plugs will NOT give you more power nor will they improce your mileage. Period.

    I'll say it again:

    There is no such thing as a plug that offers "better mileage" or "more power" when compared to the stock plugs.
  • naatz1naatz1 Posts: 188
    Interesting comments from both of you, but like I said originally I won't credit the plugs... I am a computer engineer, not an automotive engineer. All I know is for whatever reason I am getting the 5-10% better mileage than a year ago when I got just over 20 mpg on the freeway, and I know guys who are getting lower mileage with basically the same vehicle. I just did a 500 mile round trip with the 01 6 cylinder JGC with 67K miles and during 50 mile cycles on the trip computer fairly flat terrain no AC 2WD mode I got:
    - 22.7 mpg at 65 mph Wisconsin freeway limit (amazing no one driving that speed)
    - 22.0 mpg at 70 mph (still getting blown away, slow down and save gas folks!)

    Use 87 octane gas and still running original GY Wrangler SRAs which will need replacing soon. Not looking forward to the mileage drop during winter and mostly 4WD driving which in the past costs 1 mpg on the highway.

    BTW, any comments on tires? IE, is a more aggressive M&S tread like the SRA worse on gas mileage? Despite living in a rural wooded area I do not do true off roading so I suspect I really do not need this type of tread the dealer sold me on and could go with a more standard (quieter highway, better mileage?) replacement tire. I must say with 6K mile rotations I am impressed on the longevity of these Wranglers though.
  • What is the average mileage of a 6 cyl 2004 on the highway?
  • I have a 96 with window/door lock control problems similar to what you're experiencing with a 99. Took it to the local Jeep dealer because the driver's master window/door lock controller didn't work and one rear window didn't work at all. They replaced the rear window motor and regulator for about $450 and said that they couldn't get the driver's control unit to fail. Got it back, and the next day it didn't work. Saw a guy at a Thruway rest area with the same car. Asked if he had any problems with his window/door lock controller. He said "All the time. You have to bang on it." He smacked the control unit with his fist. I did it in my car, and it worked! Incredible. What are the chances that I'd run into this guy and ask the question? Will replacing the driver's master control unit solve the problem? Right now, none of the windows or door locks work. And smacking it no longer works. I don't think that the 1996 GC engineers put their best foot forward on the window control electronics. Based on the number of people on this forum who have replaced window motors and regulators, this seems to be a common problem.
  • Yesterday I picked up the brochure for the 2006 JGC. Besides the introduction of the Overland and SRT models, the only real change I could find was in the listed rear hip room. In the 2005 brochure, this is given as 60.6". In the 2006 brochure, this is given as 45.81". How could the 2006 model have about 15" less rear hip room? Is this for real or just a typo?
  • Those are the same numbers I,ve experienced all the way up to 4,900 miles. Thought the engine would "break in" but still no evidence of that. Am extremely diisappointed.
  • I have a 2000 JGC limited with 70000 miles. I have only had it for about 5 months. recently my son keeps saying that when we take off from a stop that it seems there is a "clunk" when it shifts at about 5 mph. Last night we were on the interstate running about 70 mph we noticed the engine light come on right after that it kind of hesitated, sort of like we running out of gas. Checked and we had 3/4 tank. We stopped and checked oil and trans fluid. We were stopped about 10 minutes and decided to see how it was running. At this point we were 70 miles from home at 3am. We made it home but the whole time the car was stil hesitating every few minutes. Does anyone know what this could be?? The owners manual was gone when we bought the car so I don't even have that to refer to.
    Deb :(
  • blkhemiblkhemi Posts: 1,717
    The 4.0 I-6 engine gets an EPA rating 16 city/ 21 highway
  • We are currently looking to purchase a 2001 Jeep Grand Cherokee Laredo 4.0
    I-6 but need to know what the towing limits are on this vehicle. We want to tow a 25ft ultralight trailer about 4000 lbs. empty (approx. maybe less). We have looked on this web site ( and the specifications say max is 6500 lbs. but other information we have gotten states that the max is 5000 lbs. Can anyone help? Has anyone ever towed a travel trailer with a JGC 4.0 I-6? Can this work or is this not the vehicle to look at for towing?
  • blkhemiblkhemi Posts: 1,717
    The max trailer towing cap. is 6500lbs with the factory class3 receiver. Some sites say 5000 because JGC's without the proper equipment can't tow the full 6500. The Jeep makes a great tow vehicle. I noticed on mine that when loaded, it rides much better. But if you need maximum grunt, check out a Laredo with the 4.7L V8. It can tow 7200 pounds with the factory hitch. It only gets one mpg (15/20) less than the 4.0L.
  • Thanks for the info.
  • xscoutxscout Posts: 141
    I don't think the 4.0 will have too much problem with the weight, but pushing through all that air with the fairly large flat front of a travel trailer might be a bit much. I think you will be happier with the 4.7 V8, especially when driving into the wind. Your towing MPG may actually be better with the V8 due to the need to put less pedal into it to maintain speed.
  • My 95 Jeep GC dives into the road on downhill RH curves on the driver front side only.Cannot go more than 35-40mph. Have to replace driver front side shock yearly and motor mounts yearly. Transfer case / all wheel drive issues ?
    Dealer no help.
  • Okay guys.. first off this forums has been great thus far.. alot of gained knowledge, so thanks! Hehe.. but now I have a problem. I have a 99 Jeep Grand Cherokee Larado.

    My brake lights don't seem to work when the lights on in the ON position, its only the two driver/passenger side lights also. For instance.. during the day, all three brake lights turn on just fine. But when I am driving around at night, and all the lights are working.. I step on the brake.. and I only get the center brake light.. the other two just turn off. Any ideas/ suggestions? Thanks
  • blkhemiblkhemi Posts: 1,717
    The 99-04 JGC has had problems with both right and left side brake lamps. The circuitry in the each light is what's causing your problem. When water and the elements get to the circuits, they burn out. Unfortunately, I and quite a few people were unsuccessful at finding a cheaper way to remedy the problem other than buying new taillights. At my local dealer here in Memphis, they run about $150 each.
  • Question on real world MPG experience of folks with an 2005 JGC... 3.7 L V6 (same engine as the Liberty)...

    Compared to the Liberty, the JGC has 5spd auto (versus 4spd), weighs a couple hundred pounds less, has spent enormous time in the wind tunnel, and isn't as tall...

    AND yet, its MPG is 17 city / 21 highway - the SAME as the Liberty.

    It doesn't seem to add up? Does the Quadra Drive make it all the more thirsty?

    Just curious. Thanks!
  • My climate control on my 2004 Grand Cherokee sound like they are grinding nuts... Every time I turn it on and off it goes crunch.. Had it serviced once and now its doing it again. Anyone else with a similar problem?
  • I have a 99 Jeep Grand Cherokee Larado, bought it with about 96K miles on it. So, I have been hearing a rattling sound under the hood when the car is running, I look at the fan and it is wobbling. So there seems to be alot of play in that pulley. Now my question is, is this just the pulley seperating? Or do you think its the water pump starting to fail? I have also noticed that it leaks coolant while at idle or just while the car is on, no much a slow drip.. but that is still more then I want. Any pointers would be great. Thanks
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