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Old 03-05-2012, 07:20 AM   #1
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Jeep running issues

I have a 94 wrangler 6 cylinder. Over the last 2 weeks its been giving me some issues with sputtering and loss of power and fuel mileage. When I go to accelerate it will lag really bad. It does this randomly and after a hour or so of driving. I can cut it off at a light and start it back up and it will run fine for awhile again. i have replaced my o2 sensor and map sensor. This helped somewhat because there was one point where it was a struggle to get moving after a stop light. There is a strong gas smell but i dont have a cat on there. I ordered one and will be putting it on later this week. I have been hearing coil could be the problem. I also checked my fuel pressure and its at 30 psi on the fuel rail. I have changed my cap, wires, and plugs recently. I talked to one mechanic and he said it can be since I dont have a cat that my o2 sensor is not getting hot enough and my ecu is just dumping alot of fuel into the engine. Any ideas? Should I wait until I get the cat out on and see if that is the problem?

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Old 03-05-2012, 08:35 AM   #2
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you say you cut it off, crank it up, and it runs fine?....Mine was doing the exact same thing...took the IAC and the TPS off the throttle body, cleaned the IAC, replaced the TPS and it's been fine ever since....i'm guessing the tps is the problem...

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Old 03-05-2012, 08:49 AM   #3
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crank position sensor? had a dodge truck do the same thing. same electronics so its possible.
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Old 03-05-2012, 09:22 AM   #4
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But it idles fine and ive heard the tps would affect your idle. Ill look into that somemore though. Would yours run good for awhile then all of a sudden start to sputter and sound like its out of gas? and I haven't read much into the cps so ill look more into that. Thanks
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Old 03-05-2012, 09:52 AM   #5
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But it idles fine and ive heard the tps would affect your idle. Ill look into that somemore though. Would yours run good for awhile then all of a sudden start to sputter and sound like its out of gas? and I haven't read much into the cps so ill look more into that. Thanks
Yep...didn't matter if it was highway or trails or just dirt roads....would start to spit and sputter....i'd cut it off while still rolling, crank it back up, and it would run fine..it might go 10 miles or might go 300 miles before it started them shenanigans again..and it idled just fine which led me to think it was the tps and not the iac....after replacing tps and cleaning iac i haven't had the first problem in over 2000 miles...and yes, the cps will cause the same symptoms because it screws up the timing if it's going bad.....
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Old 03-05-2012, 09:58 AM   #6
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Ok I think you have convinced me on that. Im tired of spitting money into stuff that isnt the problem though. But its a jeep I knew what I was getting into when I got it. Ill try that later when I get off work and let you know if that helps it any. Thanks again.
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Old 03-05-2012, 11:07 AM   #7
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Cat want cause that. The o2 sensor is in front of the cat. Many people run without cat, i for one.

Change fuel filter. Also maybe gunk in fuel tank clogging the fuel pump.
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Old 03-05-2012, 11:37 AM   #8
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Yea because I have been running without a cat since last summer so I didn't really want to believe that was the issue. I recently changed my fuel filter when I replaced my plugs and wires. Dropping the tank is something I am trying to avoid but will do if it comes down to it.
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Old 09-29-2012, 07:45 AM   #9
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Mine will start and run great and just dies out, sometimes it will start right up and sometimes u need to wait.in themorning it will idle for five min and just stop, fuel pressures is about 45. Changed fuel filter reguleter works its crazy
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Old 10-06-2012, 09:58 PM   #10
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hello to all 63 retired just bought a 1987 yj which i love and look foward to working on,new to jeeps
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Old 10-06-2012, 10:26 PM   #11
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I would lean toward the TPS and or IAC(the other sensor in the throttle body). Another possibility is the distributor module.

I dont think it would have anything to do with the coil, they either work or they dont, never had one that only gave a little spark or erratic spark.
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Old 10-08-2012, 08:20 AM   #12
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I ended up changing the TPS (didnt help) then the O2 sensor (also didn't help). I replaced the coil and it has been running great ever since.
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Old 10-08-2012, 08:25 AM   #13
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Ok I think you have convinced me on that. Im tired of spitting money into stuff that isnt the problem though. But its a jeep I knew what I was getting into when I got it. Ill try that later when I get off work and let you know if that helps it any. Thanks again.
My 94 does this everytime I drive through water lol... My plan is to open the hood and start it up then run the hose and spray around the engine until I can find where the prob is with water getting into something. Any chance its this for yours??? Mine will act just like its out of gas but will not completely die, then it picks right back up and all is well. On the trails, if I go through water or even splash a puddle (more often on the passenger side) it will sputter like that. Its kind of a pain, it can sputter up to 10-15 minutes after hitting the water until its good again. I'm wondering if moisture is getting into my distributor cap?

just read back to your post, I'll bet its my coil... you still running good? I'd get it wet under the hood since you replaced it to see if the symptoms come back with water?
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Old 10-22-2012, 04:25 PM   #14
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I know this is a few week old thread but what coil did you change? I have the exact same problems as your jeep and I replaced my TPS and cleaned the IAC and still have problems!
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Old 10-23-2012, 10:07 AM   #15
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i changed my ignition coil. I just picked up one from advanced auto. It solved my problems. Hopefully that will help you out too! But you could also have a clogged catalytic convertor, I was able to eliminate that because I didn't have one.
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Old 10-23-2012, 10:15 AM   #16
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Alright, I'll grab a coil and change it out! Thanks so much! I'll look into the cat if it doesn't work. Thanks again!!!!
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Old 10-23-2012, 10:27 AM   #17
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I might be in the market for a coil after reading this lol.

CAT's not an issue, won't go there...
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Old 10-23-2012, 10:36 AM   #18
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Roger that
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Old 10-24-2012, 07:29 AM   #19
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I changed out my coil, cap, and plugs and it doesn't seem to be working any better, it still has the strong smell of fuel, not sure if it shutters or whatnot hen I drive for a long time though. The idle seems a little worse, likes its bogging just sitting there.
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Old 10-24-2012, 08:14 AM   #20
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Sorry to hear that. Lets see. If you have a really strong fuel smell, maybe you should check your fuel pressure. Hopefully someone else will chime in and give some advice. i dont want to lead you the wrong way. I hate the coil didn't work for you. hmm your catalytic convertor could be clogged as well. Just some ideas.
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Old 01-12-2013, 11:54 AM   #21
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The coil heats up and it cuts out, it took 4 ever to find Cuz when it starts ur coil shows ok until it doesn't and thats when I found out.)(

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