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Old 09-08-2013, 10:14 PM   #1
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Jeeps rough idle

Ok so a few days ago my jeep started acting funny first as I was driving I noticed the voltage was rising as I accelerated and the check gauges light came on I got home shut it off and tried to start it again and I got nothing no turn over no click zero after a few tries it started I cleaned the battery cables and had the alternator and battery checked they were fine. After the cleaning it hasn't done it since but a new development started its running really rough at start up it runs fine at highway speeds but at idle it sputters and the Rpms bounce a little. I have already cleaned the iac and throttle body, ran cleaner through
The injectors. Checked the spark plugs still running rough am I missing something. Any
Help would be greatly appreciated

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Old 09-08-2013, 10:23 PM   #2
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Forgot to mention its a 03 tj automatic 4.0 with 94.000 on it always ran Mobil one synthetic.

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Old 09-09-2013, 10:32 AM   #3
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Ok so a few days ago my jeep started acting funny first as I was driving I noticed the voltage was rising as I accelerated and the check gauges light came on I got home shut it off and tried to start it again and I got nothing no turn over no click zero after a few tries it started I cleaned the battery cables and had the alternator and battery checked they were fine. After the cleaning it hasn't done it since but a new development started its running really rough at start up it runs fine at highway speeds but at idle it sputters and the Rpms bounce a little. I have already cleaned the iac and throttle body, ran cleaner through
The injectors. Checked the spark plugs still running rough am I missing something. Any
Help would be greatly appreciated
Update:
This morning the check engine light came on code p0304 misfire number 4 cylinder
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Old 09-09-2013, 10:33 AM   #4
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I'm thinking bad 02 sensor or bad pre-catalytic converter. Mine did the same thing.
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Old 09-09-2013, 11:22 PM   #5
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Turns out it was bad plugs I replaced them last year I guess it didn't like the ones I got put in new ones today and check engine light turned off and it started idling better than when I got it
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Old 09-09-2013, 11:25 PM   #6
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Distributor cap? And wires?
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Old 09-10-2013, 12:06 AM   #7
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No cap or wires on an 03
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Old 09-10-2013, 12:46 AM   #8
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Were your gaps set right when you replaced last or did u just drop them in?
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Old 09-10-2013, 08:44 AM   #9
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They were set right last year before I replaced them yesterday I even took them out to check again they didn't look that bad to me kinda ashy but not all blackened
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Old 09-10-2013, 09:26 AM   #10
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I call foul :-)
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Old 09-10-2013, 08:38 PM   #11
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Turns out it was bad plugs I replaced them last year I guess it didn't like the ones I got put in new ones today and check engine light turned off and it started idling better than when I got it
Were they Bosch double platinum plugs?
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Old 09-10-2013, 08:57 PM   #12
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Ya when I got it I didn't know much about keeps thought the more expensive ones would be better. Drove the jeeps today still has a little rough spot but no where near as bad as it was

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