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Jeep Wrangler Maintenance and Repair Questions (1997 - 2006)

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  • mclarke06mclarke06 Posts: 3
    My 98 wrangler seems to have trouble getting fuel a few min after starting it. It sputters so i give it a more gas and it powers through. After a few cycles of this, sputtering and lunging, it goes away and runs fine. When it is sputtering i push the clutch in so as to ease the lunges and it barely keeps idling and after a few seconds it corrects itself back up to normal idle rpms. I changed out the crank position sensor because i did a resistance check on the old one and got an open circuit (infinite ohms). The manual calls out a spec of about 250 ohms. I checked the new one before installing it and it was in spec. After the swap my jeep still exhibits the same symptoms. Is there a camshaft sensor on a 98 wrangler? I also changed my plugs and it didnt help. Any help or suggestions would be appreciated!
  • saharastevesaharasteve Posts: 15
    My 98 did the same thing 2 years ago, and I changed and tried everything until I found this forum. After following Mac24's advice.it has ran like a top ever since and a lot of local mechanics are following the same advice. Do you hear an exhaust leak on you exhaust manifold? What is happening is they have been known to crack. As your engine warms up, the crack expands and contracts, letting air into your exhuast. This air makes your O2 senser make the adjustments that it thinks it needs but doesn't, changing your fuel mixture causing the sputtering. usually after you reach operating temperature, it quits sputtering. I changed the exhuast manifold and put on a new O2 sensor for good measure and have not had a problem in 2 years now. Let me know how it works out for you.
  • erickplerickpl Posts: 2,735
    Sounds about right. May want to see if you have any OBDII codes in your system. Mine ran like that too but it was a faulty throttle position sensor (due to excessive mud O:) ).

    -Paul
  • mac24mac24 Posts: 3,910
    And just to add to the fun, yes there's a camshaft position sensor on a '98. It's in the base of the distributor.
  • mclarke06mclarke06 Posts: 3
    Yeah my exhaust manifold cracked a three years ago with a replacement from jeep. That cracked about a year later. So i replaced the manifold with a stainless steel aftermarket manifold and its held up fine since. I will replace the O2 anyway. If that doesnt do it i guess the camshaft sensor or the throttle position sensor is next in line. Thanks for the info!
  • mclarke06mclarke06 Posts: 3
    Well i did some in depth research and this is what i have found. There are 2 O2 sensors. The front one is the one that does most of the work and the rear sensor pretty much tells your pcm how efficient your cattalitic converter is operating. The Front O2 sensor has a heating element inside of it. When you first turn on your car the heating element turns on so as to heat up the sensor. The sensor has to be at operating temp to work correctly so the heater takes care of this. However in that small time your O2 sensor is heating up your PCM ignores the sensor input and just gives preset signal for air fuel mixture. Then after a little while the PCM accepts the input from the O2 sensor. The O2 sensor tells the PCM to run rich or lean based on the O2 output coming from the engine. The signal is from 0 to 1 volt. If the sensor is not heated properly it gives crappy info to the PCM affecting the air/fuel mixture. I changed out the O2 sensor and the lunging has stopped. The resistance of the O2 sensor i pulled out was in spec. The heater must have been toast. It is recommended you replace them every 100000 miles.
    Success! Thanks!
  • dav332dav332 Posts: 1
    My 97 Wrangler is making a loud tapping sound, seems to be coming from the front underside around the oil pan/transmission pan area. I had the same noise a little over a year ago and just so happened to have an inspection appointment. The dealer fixed it for $50 and said it was a loose dust cover?? The dealer has since gone out of business so no luck in asking them what they fixed.

    The engine is an auto 6 cyl and has just under 60K miles on it. The main problem is that it doesn't make the noise all of the time and doesn't seem to have a pattern to make it occur, so when it does happen due to the heat of the engine makes it hard to diagnose. The best I can describe the sound is a metallic tapping sound (kind of like if you were to put a thin piece of sheet metal against the spokes of a bike tire while it was spinning) that increases/decreases with acceleration/de-celeration. After the noise starts it will continue in all gears.

    Thanks for any help.
  • burntupburntup Posts: 64
    You should be able to go to any dealer and have them pull up the records of any and all work done on your Jeep.
    The dust cover on your Jeep is between the engine and transmission. Should be an easy fix if it just involves tightening up th bolts.
    My guess for the kind of noise that you describe would be that there is an issue with your torque converter. High pressure hydraulic fluid can have a metallic sound.
    Good luck.
  • jeepguy48jeepguy48 Posts: 9
    my 97 jeep pops through the in take at wide open throttle and high rpm. I have changed many of the sensors distributor, plugs, wires,
  • erickplerickpl Posts: 2,735
    Can you elaborate on that popping? Exhaust popping? Axle making popping noises?

    -Paul
  • I'am not a mechanic, where is the manifold and the O2 sensor located? How much did this cost?
  • I recently took my jeep in the mud. Everything ran fine until i washed the engine. After the engine was washed the check engine light came on and the engine sputters as if it wanted to shut off. If i leave it idle the engine will shut off. Help PLZ, i will not take my jeep in the mud again!!!
  • jeepguy48jeepguy48 Posts: 9
    popping from the intake only does it at high rpm wide open throttle. can take it to the rev limiter at part throttle and no popping. I knowing it is more likely called a backfire but you get the point.
  • jeepguy48jeepguy48 Posts: 9
    dont get to worried you just probly got water in the distributer. just pull the cap and blow it out with compressed air reinstall and you should be fine.
    p.s. MUD is s.p.f. for Jeeps
  • erickplerickpl Posts: 2,735
    Mud + water usually means your Throttle position Sensor got uh... messed up. :)

    $53.00 or so at autozone and 10 minutes later you'll be on the road. Autozone or any good auto part store should be able to read the code and have it tell you what the issue is.

    I messed mine up wheeling in mud. Died while driving 55mph on the highway back to the hotel --- WHILE CROSSING A BRIDGE! That was fun.

    It could be the distributor too, so it would be worth a look see by opening it up and checking the points and such to ensure they are dry. If not, shoot some WD40 in there (after all it IS for water displacement) and try again. But if you are throwing codes, I'm willing to bet your TPS is shot.
  • erickplerickpl Posts: 2,735
    What kind of gas you running?

    I'd suggest some decent fuel injector cleaner into the gas tank and perhaps fill up at Chevron (or buy some Techron) just to help clean things out.

    I'd also consider checking the plugs/wires to ensure they are working fine. Check the coloration on the plugs to determine if the engine is running lean or rich. I'd also check the air filter to ensure it is clean.

    It SOUNDS to me like either bad gas or a few minor maintenance issues may be the culprit. Mine has never had that noise so I'm not too sure where to point ya?

    Mac?????

    -Paul
  • jeepguy48jeepguy48 Posts: 9
    I use an injector cleaner on a regular bases. i have tried new cap, rotor, plugs,coil, cam position sensor, crank position sensor, o2 sensors, throttle position sensor, manifold air temp sensor, coolant temp sensor. the next thing i'm thinking of doing is the manifold absolute pressure sensor, computer, or timing chain. I have been chasing this for over a year and getting determined to figure this out even if it kills me. Was hoping someone has had a similar problem and maybe get some help. thanks
  • erickplerickpl Posts: 2,735
    Not sure if this will help, but did you see if you have a broken/cracked manifold?

    -Paul
  • jeepguy48jeepguy48 Posts: 9
    intake or exhaust
  • jeepboatjeepboat Posts: 1
    I recently dove my 2001 Jeep Wrangler into a mud pit and got it stuck. I didnt know at the time that the dealership or the previous owners had pulled the drain plugs and when I got stuck I flooded the interior of the jeep. Im sure im not the first person to do this so any cleaning tips anyone might give me would be greatly appreciated.

    I also had to be pulled out and when I came out I couldnt get the clutch to engage. After a 4 mile tow by my buddys jeep out of the woods I had it Towed to my mechanic. Thinking I had destroyed the clutch. My mechanic "also a jeep enthusiast" told me that I had somehow jammed enough mud into the slave cylinder to prevent it from engageing the clutch. He cleaned it and the jeep worked again. However my clutch still seems slugish and my check guages light keeps popping on. I plan to due a full fluid replacement oil, transmission fluid, radiator flush. Any advise on either problem would also be appreciated. P.S. this is a 2001 4 cylinder 5 speed. also any advise on how to prevent this from happening again.
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