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Old 09-15-2005, 10:36 PM
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Help! Jeep Idle Air Control

My sons 1991 Jeep Cherokee wagon, 6 cylinder, throttle body injection, bone stock won't idle. There is no idle adjustment, all computer stuff.

He's owned it for a year or so, parked it to go to the north slope working for two days, returned and the battery was dead. Got a jump and it wouldn't idle. It starts fine, idles for about a minute or two then slowly dies off and stalls.

He brought it over tonight and I couldn't find any obvious problems. When I disconnected any vacuum connection on the intake it would idle up high, obviously leaning it out, providing air to the intake charge. The only reference I could find in the manual was the idle air control valve (a plunger affair that draws back to allow air to move into the throttle body, around the throttle plate with a 4-pin connector to it) on the rear of the throttle body. Remove id and it was fairly cruddy. I could move the plunger in and out, when I pushed it into the AIC module and reinstalled it, it idled very high, when extended, closing off or restricting the air channel, it would die. So I bought a new AIC valve, same thing. I have no idea what controls it's operation or where to go now. I positioned it for a decent idle, it stayed there and he drove it home, hoping it would be a happy medium and get him to work until I can figure things out.

Any of you guys ever have an issue like this or know what we can do next? The valve is obviously not moving to provide idle air adjustment for different conditions.

Thanks to the keepers and members of this board, you've pulled me out of the woods several times! Larry

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Old 09-16-2005, 04:17 AM
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on jeeps it takes the computor a while 2 learn idle you may have to drive to get it 2 learn .or u have a vacum leak which will keep the iac closed
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