ac causing problems- why is my ac causing my jeep to cut off - JeepForum.com

 
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post #1 of 7 Old 08-07-2007, 09:04 AM Thread Starter
cvaria
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ac causing problems- why is my ac causing my jeep to cut off

why is my ac causing my jeep to cut off?

I have an 02 tj se and it idless rough and does insane things when the ac is on. the ac unit itself is on the lamb. the knobs are not accurate. i have to fiddle with it to get the ac to turn off. what is going on?

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post #2 of 7 Old 08-07-2007, 09:06 AM
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What are you idling at without the AC on?

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post #3 of 7 Old 08-07-2007, 09:15 AM Thread Starter
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Quote:
Originally Posted by Unscathed
What are you idling at without the AC on?
<p> rough below "1" and sometimes it will just cut off if i take it out of gear while driving and i'll have to use the gas petal to start it back up. (happened on the expressway too). if i down-shift through the gears to come to a stop it will temporarily behave but eventually cut off. i noticed that it was the ac doing this when i got frustrated and just sat in the jeep one day when it had gotten out of control. i noticed that the ac switch was on the little jeep with the "u" in it. there was nothing going on as far as temp control, just the switch was there. i turned it of and the jeep went back to normal.
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post #4 of 7 Old 08-07-2007, 09:47 AM
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sounds like the engine is starving for fuel....maybe fuel pump

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post #5 of 7 Old 08-07-2007, 10:07 AM
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Well idle between 500-800 is normal... rough is not..

I would do the following first before fooling with anything else.. easy first.. hard later.

First, change your air cleaner... (10 bucks)
Second, give it some new spark plugs. (12 bucks)

Do that first.. as you would need to do it anyway for a tuneup.. and post your progress here and we will move on to other steps.

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post #6 of 7 Old 08-07-2007, 10:29 AM
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Vacumn leak, need a tune up maybe? Your jeep is supposed to idle up when AC is on (to compensate for the drag the compressor puts on the motor so all in all it will equal out on the rpm guage instead of dropping lower and stalling)

Sounds like it may not idling up and like you have 2 problems or more

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post #7 of 7 Old 08-07-2007, 10:42 AM
Big-E
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My vote is Vacumn leak.

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