Originally Posted by cruiser54

Courtesy of TJWalker:
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The Idle Air Control (IAC) is mounted on the back of the throttle body. (front for 87-90) The valve controls the idle speed of the engine by controlling the amount of air flowing through the air control passage. It consists of a stepper motor that moves a pintle shaped plunger in and out of the air control passage. When the valve plunger is moved in, the air control passage flows more air which raises the idle speed. When the valve plunger is moved out, the air control passage flows less air which lowers the idle speed. Over time and miles, the IAC can get carboned up which can have an adverse affect on idle quality. Cleaning the IAC may restore proper function and is an easy procedure to perform and good preventive maintenance so it is never a bad idea.

CLEANING THE JEEP 4.0 IDLE AIR CONTROL

Remove the air filter cover, associated hoses and the rubber boot that goes from the air filter cover to the throttle body. Remove the IAC with a torx driver (2 bolts; one can be kind of hard to get to)

“Gently” wiggle out the IAC from the throttle body. Gasket on the IAC can be re-used if it is not damaged

Clean the IAC with a spray can of throttle body cleaner; inexpensive and available at any place that sells auto parts. Throttle body cleaner is recommended rather than carburetor cleaner as it is less harsh, safe for throttle body coatings and is best for this task. Use cleaner, a rag and a toothbrush and or Q-Tips. Be gentle; don’t twist or pull on the pintle that protrudes from the IAC as it is fragile and you could damage it.

Thoroughly spray clean and flush where the IAC seats in the throttle body with the same spray cleaner

It is also a good idea to clean the entire throttle body itself, the butterfly valve inside of the throttle body and all associated linkage as long as you have things disassembled

Originally Posted by Coastie05

Nope I sure haven't, but I'm going to now. Hopefully cleaning it does the trick.

Originally Posted by cruiser54

Please report back.

Originally Posted by DFlintstone

Hey! Cruiser helped with an 01! (we all should remember, of a comet is melting on the backside if the sun, Pete is your guy for an 01!)

Originally Posted by DFlintstone

Hey! Cruiser helped with an 01! (we all should remember, of a comet is melting on the backside if the sun, Pete is your guy for an 01!)

Originally Posted by salad

Geez I guess he can throw out that old DRB scanner and buy an OBD-II gadget made this millenium!

Originally Posted by cruiser54

"There's no place like home". I just clicked my heels together and got snapped back into my time zone.

Originally Posted by salad

"I'll get you, my pretty! You and your little Jeep, too!"
- Wicked Witch of the PCM