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Old 07-15-2011, 05:52 PM
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Question 98 Jeep Wrangler Running Rough

I need help! My 98 jeep wrangler runs very rough when you first start out in the mornings. For the first mile or so it will cut out, back fire, sputter, etc... I have changed the fuel temp sensor, put fuel injector cleaner in, changed the timing belt and even took it to the jeep dealership and they could not figure out what is wrong. If anyone else has had this problem please let me know what will fix it.
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Old 07-15-2011, 06:01 PM   #2
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mine is doing the same thing! was gonna have the 4x4 shop eval it when it goes in thurs for the lift. Does yours run fine once its up to temp? mine does. Only does this on start up too for about a mile or so. the other day I had to run back into the house and it sat and warmed up and by the time I left it didnt do it. I am thinking some sort of sensor. good luck, I will be reading this thread to see what the experienced jeepers say too

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Old 07-18-2011, 10:39 PM
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That is exactly what mine does. Someone told me that it may be the o2 sensor but I haven't changed it yet. If you get more advice when you go get your lift please let me know.
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Old 07-18-2011, 10:48 PM   #4
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Originally Posted by shedrick View Post
That is exactly what mine does. Someone told me that it may be the o2 sensor but I haven't changed it yet. If you get more advice when you go get your lift please let me know.
Thanks
I am not the OP of this thread but would be happy to share what I find out. spoke with the shop and its getting dropped off tomorrow. Im so excited for it to get new shocks and lifted
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Old 07-18-2011, 11:34 PM   #5
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A bad 02 sensor shouldn't cause such extreme running problems, and actually the ECM isn't taking feedback from the 02 sensor until the engine is up to normal running temp, so the problem would be the opposite.

Check out the coolant temp sensor. Not the sender for the gauge that's in the back of the head, the one for the computer in the water outlet. It's just a wild guess, but the symptoms are right. Lots of times they go bad and throw a weird reading only when cold, but start working when it warms up. It'll give a pegged reading like -30F or something on a cold start, which makes the ECM want to dump as much fuel as it can through the injectors and the engine goes crazy rich, starts backfiring and stalling.
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Old 07-19-2011, 02:17 AM   #6
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not that it matters much to me but you might try posting this in the TJ forum.. since your jeep is not a YJ maybe a mod can move it for you?
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Old 07-20-2011, 12:12 PM   #7
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Quote:
Originally Posted by shedrick
I need help! My 98 jeep wrangler runs very rough when you first start out in the mornings. For the first mile or so it will cut out, back fire, sputter, etc... I have changed the fuel temp sensor, put fuel injector cleaner in, changed the timing belt and even took it to the jeep dealership and they could not figure out what is wrong. If anyone else has had this problem please let me know what will fix it.
Thanks,
[email protected]
I have a 91 wrangler and mine started to do the same thing but it happened when in sunk it in a mud hole for 3 hours. I don't think it's the same exact problem bud if anyone has advice to help that would be great! And I was stuck down to my floor board. I think it might be electrical. And I never cut it off while it was in the water
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Old 07-20-2011, 10:07 PM   #8
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OK, here goes. shop found completely broken motor mounts. only thing holding the motor was the connection to the tranny. so, with new MM they said it is running perfect. they drove it, no vibes, no sputtering, no rough idle, no bucking. they feel my motor was so out of place it was putting strain on other stuff in engine causing it to be unhappy and act up. now running perfect per the shop. cant wait to get it back tomorrow

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