rough idle when first start up until warms up. - JeepForum.com
 
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post #1 of 8 Old 07-02-2012, 06:03 PM Thread Starter
vietboysi92
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rough idle when first start up until warms up.

Ok guys need help!! this is my first Jeep (love it by the way).. when i first start my jeep up in the AM. i have to let it warmup and get past the rough loping idle before i drive it, might take 3-5 min to get past it or faster if i rev it up and get it past the cutting out.. if i just start it and try to drive it, it starts sputtering and cutting out real bad.. but once it gets past all the initial crap then it runs great... also if i get past all that and drive it to lets say wal-mart.. which is 5 mins away.. i go inside for maybe 10-20min.. when i come out to my jeep i have to start it up and let it run again past the loping while i load everything up in it.. people think ive got it cammed or a loping V8 in it while its running at first!! lol BTW its the 4.0 no cat.. both O2 sensors are hooked up.. glass pack on it also.. love the way it sounds.. thanks guys and greatly appreciate your help

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post #2 of 8 Old 07-02-2012, 06:22 PM
CJ7-Tim
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It sounds like you are describing some sensor issues that occur when the the Jeep switches to closed loop operation.

Test the O2 sensors, they can get old and slow to react. Typical O2 sensor service life is about 100,000-150,000 miles.

Replace the coolant temperature sensor on the thermostat housing.

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post #3 of 8 Old 07-02-2012, 06:27 PM Thread Starter
vietboysi92
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Ok.. The second o2sensor is brand new.. But the one closer to the motor is older.. I just got the jeep last summer after the tornado.. The second wasn't even hooked up.. Thanks man
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post #4 of 8 Old 07-02-2012, 06:51 PM
n5xl
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the o2 you want to change is the one closest to the engine.

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post #5 of 8 Old 07-02-2012, 06:58 PM Thread Starter
vietboysi92
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Ok thanks.. Hopefully this will fix it.
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post #6 of 8 Old 07-03-2012, 10:12 PM Thread Starter
vietboysi92
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Thanks alot guys!! Replaced o2 sensor and it fixed my problem!!!!!
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post #7 of 8 Old 07-04-2012, 06:38 AM
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Glad to hear. Are both O2 sensors the same part?
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post #8 of 8 Old 07-04-2012, 08:00 AM Thread Starter
vietboysi92
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I don't think so.. I only replaced the upstream sensor.. The second one I installed recently..
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Tags
bucking , misfire , o2 sensor , rough idle , sputering , stall , stalling

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