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Old 02-29-2012, 12:37 PM   #1
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Hesitation when cold under acceleration?

I have noticed that the jeep has started to hesitate a bit when I first start it from cold. SO, when I go out in the morning, or after its been sitting at work for a while, I go out, start it, and it starts right up, but when I push the gas pedal, it bucks a little and hesitates. After about 30 seconds, its gone, and doesn't happen again.

Any help would be appreciated. Dropped it at my local mechanic, and of course it didn't act up, and he had it for two days, so he couldn't give me an answer.

Kevin

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Old 02-29-2012, 12:51 PM   #2
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Search on here for threads about cleaning the Throttle body and sensors. Also could be an erratic spark issue (coil, spark plugs, plug wires, etc).

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Old 02-29-2012, 02:20 PM   #3
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Try unplugging your upstream o2 sensor and see if the problem goes away. Unplugging it will throw a code but will let you know if it's the culprit. This was the situation with my tj last fall. Replaced my sensor and have been running great ever since.
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Old 02-29-2012, 02:31 PM   #4
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Without searching around, can I be lazy and ask you where that sensor is located?

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Old 02-29-2012, 05:06 PM   #5
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+ 1 for the 02
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Old 03-01-2012, 11:09 AM   #6
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Quote:
Try unplugging your upstream o2 sensor and see if the problem goes away. Unplugging it will throw a code but will let you know if it's the culprit. This was the situation with my tj last fall. Replaced my sensor and have been running great ever since.

ditto. mine does the exact thing, after a reading as much as i could, sounds likes thats exactly what it is.
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Old 03-01-2012, 11:25 AM   #7
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Unplugging the upstream o2 can help identify if its the problem or not.. when the jeep fires up if it is not at operating temperature it runs a default fuel map for "cold" mode, and disregards what the o2 sensors are reporting. Once it has warmed up then the o2 plays a role in determining the air fuel ratio on the fly, as it will try to stay close to stoich as possible to burn all the fuel.. the o2 is usually disregarded at WOT as well. Most people will notice their vehicle runs crappy when it warms up, and is fine when its still cold..
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Old 03-01-2012, 11:27 AM   #8
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check ur transmission fluid.

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