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Old 04-02-2008, 11:00 AM   #1
Jonny15's Avatar
Join Date: May 2007
Location: Dover, New Hampshire
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rough idle for 5 or 10 minutes...

Hey everyone, ive got something for you all to figure out. I usually garage my jeep but the past week or so i've had it with me at college. Now i let it sit for about 5 days without running it in good weather (no rain). When i got in to start it up after these 5 days it ran fine.

So i left it again this time for about 2 days of steady rain. I get in to start it up yesterday and it idled really rough. When i put it in gear it was almost about to stall until i got it over 2000 rpm, then it ran perfectly smooth. But as soon as i let off the accelerator and dropped the rpms below 2000 again it wanted to stall out on me and ran extremely rough.

This whole problem only lasted for about 5 or 10 minutes, then this problem just vanished and it ran and idled smooth as ever. I've never had this problem before but my dad who has driven it a few times has had that happen twice to him. Again my jeep is usually garaged so it never sits out overnight in the rain. My dad only drives my jeep when its snowing out, so again its back to wet weather.

I'm thinking that this problem has something to do with moisture somewhere but i dont know where. Again this problem went away within 5 to 10 minutes and it ran perfect after that. I also started up this morning after leaving it in the garage (i came home for the night) and it started up and ran just fine. It just seems to have a problem idling and running below 2000 rpms for about 5 or 10 minutes after leaving it out in rain or snow overnight.

Any ideas??

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Old 04-02-2008, 12:33 PM   #2
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Location: Des Moines, Iowa
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what year is it? does it have distributor?

2004 TJ
4" suspension lift
sye/TW driveshaft
NTH degree c/a
2" body lift
aussie locker
Rancho rs9000 shocks
tube bumpers
33x12.50 firestone's
cold air intake
throttle body spacer
rear led's
sony MEX5DI deck
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Old 04-02-2008, 01:26 PM   #3
Knows a couple things...

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How is your battery? A very weak battery can make the engine run roughly since the alternator can't put out its full output when the battery is very weak.
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Old 04-02-2008, 02:12 PM   #4
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Join Date: May 2007
Location: Dover, New Hampshire
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The battery seems to be fine, it's never given me any problems. And yes it does have a distributor, which is the main culprit on my list of possibilities right now, as i know that if there is a crack in it somewhere and water gets in it'll run rough like that.
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Old 04-02-2008, 02:26 PM   #5
Join Date: Sep 2006
Location: pahrump Nevada
Posts: 1,241
every morning I have rough Idle when I start the jeep but only for about 30-60 seconds
I have changed the throttle pos. sensors but its still there I think its the Idle air control sensor
but thats on my jeep
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Old 04-02-2008, 07:34 PM   #6
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how old are your wires? try sprayng ignition wires w/ spray bottle full of water. if it acts up after you spray wires, or you see arcing, tune up time. wouldn't be a bad idea if you haven't done it anyway.

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