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Jeep Wrangler



  • Don't get me wrong, I love my wrangler. I recently noticed, if I drive around for a while and then it iddles for 5-7 minutes. The time it usually takes to fill up, lower the top and wash the windows. (With the engine running) After I leave, the engine sounds like it's on 4L. But it's not. When I reach 2000rpm it sounds really loud and I have to shift right away. Same thing with 2nd, 3rd and fourth gear. I also doesn't get a lot of power. It sounds like I get a lot power because of the noise, but I don't.
    After a few minutes of normal driving, it will usually go away by it self. Or if I turn off the engine and let it cool down, then it will be OK.
    I need to remind you, I live in South Florida and it's very hot 90-95F. I don't think it should matter...

    I called my service manager and explained the problem. He doesn't know what I'm talking about. Since it's an intermitent problem, I'm afraid it might be very difficult to find.

  • I have a 2000 Sport 4.0. I live in Kansas and not too long ago it was very hot, 30+ days of 100+. During those days, if I sat in traffic or at a drive through, my Jeep also made the noises you describe when I would first take off after sitting. I had planned on taking it in, but now it is cold here and it will not do it. My Jeep would act like yours, the motor would rev higher than normal, make a lot of noise"as if I was really deep into the throttle", but the horse power would be weak, and after driving it about a minute, it starts to operate properly. If you find out what the problem is, please post it on this forum, I would really like to know.
  • Manual vs. Automatic is a much debated topic for Jeep drivers. They are both good, depending on your preference. The only negative to an automatic is that is takes quite abit more power away than a manual, and gas mileage is not as good either. But, if you do a lot of city driving or rock climbing, the auto may be the way for you to go. I have not known many people to have much trouble with either the manual or automatic in the YJs. Just make sure to check the Jeep out well that you are planning on buying.
  • mac24mac24 Posts: 3,910
    First, (both of you), does the engine really rev high, i.e. does the tachometer show a dramatic increase, or does it just SOUND as if the revs are climbing?

    Second, onlyinajeep, is yours a manual or auto?
  • My jeep is a manual. The tach does not jump up significantly, but it holds the RPM's at a higher rate when this happens. What I mean is that when I take off after sitting, the engine will jump up to 3000 and stay there longer than normal. When it does this, the motor is really loud, sounds as if it were pushing a lot of air, and when this happens the acceleration and torque is low, even though the RPM's are high.
  • Can someone tell me what the colors were for the '99s? I have found a dealership where I can get a "program" wrangler for 14,000 and am making a list of the options and colors I would like.
    ps-someone asked "why not buy a new one?", and I just don't have that much money to spend(even on a great jeep!).
  • Mine is also a 5 speed. The noise is when I reach 2000Rpm and up. I can be sitting at a light and rev up the engine up to 2000Rpm and I'll hear it. The engine won't jump up by it self. Sounds very much like dragonfly, it sounds like it's pushing a lot of air, the acceleration and torque is low.
    When this happens and I'm sitting at a light, the Rpm won't jump up at all. It stays normal at 1000.
    You know the way your motor sounds when you're on 4L. It sounds really strong with a lot of torque and low acceleration.
    That's exactly the way mine sounds, when I'm on 2H. So when this happens, I'll be shifting around 1800 or so because I don't want to break anything or make it worst.
    Like I said, it will go away by itself after a few minutes.
    I also looked at all my instruments, and they're all normal.

    Dennis :-(
  • mac24mac24 Posts: 3,910
    I guess I should have asked if you both have the I-6 as well. However, let's make some assumptions; that you both have the same engine and that as well as having the same symptoms, you both have the same problem.

    If, as dpage says, he has the symptoms while revving the engine at a light, then it's not related to the clutch or gearbox. If the clutch was slipping there would be a rise in engine rpm and a lack of acceleration, but the vehicle would have to be moving to demonstrate this.

    So, the most likely culprit for an increase in engine noise, together with a lack of power, would be either an exhaust leak or an intake leak. The higher the temperature the greater the likelyhood of mating surfaces warping. The I-6 has had a history of broken exhaust manifolds in the past, but from the way you describe the noise I would guess at an intake leak being the most likely cause.

    Does that sound as though it makes sense to you? It's something that's easily fixed in either case, and will be covered by warranty anyway. Make sure to let us all know how you get on.
  • markbuckmarkbuck Posts: 1,021
    Fan clutch is engaging, pulling tons of air thru radiator for a few minutes (sounds like, well, a giant fan is running under the hood) until the fan clutch detects that it is cool enough and allows the fan to freewheel on the water pump shaft.

    Fan probably takes about 10 hp to run, so your engine will give you much less acceleration.

    The newer fan clutches use a silicone fluid which "gells" at a very small temp change, like between 205 and 210F. The engine computer might detect this load and increase the throttle setting to maintain idle. Everything is working correctly.

    Idling or high load conditions (up hill, towing) will raise the temp under the hood.

    Do I win the nickel?
  • I was wondering about that fan myself. The Jeep in question has the 4.0. My wife drives the 4 cylinder and it does not do this even on the hottest of days, it is a 1999. I have let the 4.0 run in the driveway on hot days and would pop open the hood to see if I could figure out why it makes such a noise and the fan was the only thing I could see that would create such a noise. If it is the fan, it sure is zapping a lot of power and response from the motor. Luckily, this only happens on the hottest of days and only for about a couple miles of driving, then the noise subsides and the power returns. I doubt that it will make the noise again until next summer, it is too cool here now for it to be duplicated. Hey dpage39525, have you ever let your Jeep run after you got home and opened the hood to see what is making the noise? I would really like to check out my Jeep again, but it is cold here and I can't get my Jeep hot enough, so maybe you could check yours to see if maybe it is the fan clutch. That sounds like a very possible explanation, I hope so anyway.
  • spoogspoog Posts: 1,224
    Imagine if they made a Jeep that was built like a toyota. Man , that would be something.
  • Just wanted to comment on the humming noise...I was going to say the same thing Markbuck did, but he beat me to it!

    I would say it is definately the fan clutch. Your jeep is working 4.0L I6 did the same thing once or twice. It is now cooling off here in PA, so I doubt it will happen again...If you listen close to some of the Chevy 4.3L engines they sound that way almost constantly...not sure if the fan is direct shaft from engine or not...but it's definately the fan.

    just thought I'd throw in my .02...

    Any you jeepers out there have a soft top and use a canoe? I'm looking for a good roof rack that will carry about 200lbs (for the camping gear and etc.) and that will also carry a canoe. I think olympic makes one and warrior products, but i need something that tilts so i can take down the top. Any input would be great!!


    -the pizzadude
  • mac24mac24 Posts: 3,910
    Yup, I'd go along with that, easy to check too. Just lift the hood. If it is that, there's nothing to fix. I guess I was visualizing the wrong kind of noise :-)
  • markbuckmarkbuck Posts: 1,021
    So, you have a 190 hp I-6. Well it only makes maybe 60hp off idle. You are running the A/C, the fan clutch is engaged, each stealing 10 hp. So you have only 2/3 the hp at slow engine speeds. Combine that with a manual and the engine will seem really boggy.

    I have the same problem with my 255hp 4.8L Chevy 5-speed when pulling a trailer. Automatic transmissions handle this problem better 'cuz it allow the engine rpm to rise via slip in the torque converter.....

    So, worst case would be a manual tranny'd, tall gear ratio'd, just above idle engine that is also spinning the A/C compressor and the cooling fan

    Solution, spin the tar outta it in each gear. Noise won't hurt anything. If you normally shift at 3k rpm, let it run out to 3,500 rpm when the a/c is on and the cooling fan is howling....

    Don't worry, be happy!
  • abbdabbd Posts: 2
  • I've got a 2000, with 5000 miles. The noise sounds as though its coming from the tires or bearings. It's like a rubbing or a whirling noise that increases as your speed increases.
    I had it to the dealer and they suggested it was simply the tire noise (stock P225s) I am hearing, and it was normal, and they blamed it on the fact that I've removed all the carpet, so its more noticable. I'll give em that it would be louder without carpet, but this isn't tire noise.

    It appears to be getting louder now, and what really sets it off is water! If I wash it, or drive it in the rain, it becomes much louder.

    Any ideas as to what this is?
  • Markbuck, are you a mechanic? You're right on the money.
    Since I live in South Florida and it's hot the fan cluth engages when it gets too hot.
    My mechanic said that it's normal.
    I still love my Jeep and wouln't trade it for a toyota.

    Denis :-)
  • the price he wants is characteristic of a 1995 wrangler. i got a 91 w/ 4cyl/5spd hard soft tops, both doors, 4" susp lift, and 31" tires, 90000 miles for $5500. aim for around 6000 maybe more maybe less.

  • Thanks for the all the postings. dpage35925, I am glad you posted your problem, I always wanted to know for sure what was causing the noise. And hey markbuck, we owe you a nickel.
  • Hey I had to write, remember...any noise you here in a jeep is normal...
  • markbuckmarkbuck Posts: 1,021
    the 2001 tops are around 3.5 dB quieter - which equates to less than half as loud....
  • Needs some info on 1992 Jeep Wrangler. I've never owned a Jeep and am thinking about buying one as a family toy. The Jeep appears to be in good shape with oversized tires and doesn't look like it has been offroad. Asking price is $6300 with 85k miles. I need everyones vast knowledge to help in the decision. Thanks in advance!
  • Well I ordered my 2001 Jeep Wrangler and it only took approximately one month, but when it arrived off of the trailer on sat night, as I was passing the dealership, I went over to look at my new jeep. It had every option that I had ordered except the deep tinted factory windows, which it looked horrible without. The dealer made a mistake when he ordered my vehicle, he thought that the deep tinted windows were standard on the 2001. Not to mention, the deep tinted windows come factory done on the softop, which I totally wanted. So here I am going to wait probably another month. My heart was broken when it came in and I saw that it was wrong. I can't wait until I get it. Sorry, I just had to vent on this situation.
  • Hey blackjeep,
    I feel bad for you. Can't they just switch the windows with another one. Do you have the full metal doors. If yes you can also have them swith the entire doors.
    I would be pissed if I'd have to wait another month.
    Talk to the manager and be firm. If he doesn't want, tell him you'll remember that when the Daimler Chrysler survey comes in. Beleive me, for some unknown reason, when you mention survey, they start doing cart wheels.
    Keep us posted

  • The latest I read on the web says that the Wrangler is going to a modular top in 2002. A great idea considering all I've heard about removing the hard top. I'm assuming this is replacing the hard top and the soft top will still be available. Does anyone know if the modular top is going to be composite or metal/bolt on or integrated into the body? Will it be available aftermarket for earlier years?

    In 2003 they are switching to the new Cherokee platform, adding independent suspension, and going to a 3.? L engine. What car is that engine used in now? Sure it will be quieter and more economical, but worry if it will have enough torque.

    With the switch to IS, do you think the 2002 will be considered the last "real Jeep" or will Jeepsters embrace the '03?

    Am trying to decide if I should buy a 2001 a 2002 or a 2003.

  • Look at the Jeep Icon concept vehicle. That is the type of modular top they are speaking of. The roof and roll bar are integrated. When you remove the pieces of the roof, only the rollbar remains (which is part of the roof). I would guess it would be a composite made like the new plastic top they are supposed to be testing this year. As for the IFS, if you wanna go rock crawling, get your Jeep before 2002.
  • Hey,
    I have a question, I have two options for getting a Wrangler. Option 1: 2000 TJ SE with 23 miles for $ 15,000 or a 97 TJ Sport with around 40,000 or so miles for $ 15,000. Both stick and soft top. Which one would be the better buy? I am concerned about the power of the 4cyl. Can anyone offer advice on what I should go for? Also, I plan to put 30-31 in tires on the TJ so with that in mind, will the 4 cyl be too bogged down? What is my better buy?
  • Yeah, I've seen the Icon and it definitely looks plastic. Have you seen the Mountain Biker concept? It seems to have a metal roof. It looks good to me.

    I hate the idea of buying a car the last year before a model change. It dates your car right away. If the 2003 is not a success though, then the 2002 may become a sought after year.
  • Removing the hardtop is not that difficult if you use a harness in your garage.
    The engine in the '03 Jeep is completely new engine as I understand it. So it is not used in any car now. The I6 is a proven engine and I would buy a 2001 and would not wait any longer.

  • The 4 cyc should be fine as far power goes for off-roading. I don't think you will have a problem with 30 or 31's. I would try to go new if you can.
    I have a 6 cyc and will never own a 4 cyc jeep again. I think the 4 cyc sucks on the highway. I guess if you drive around 60 and maybe 70 you will be OK.
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