Originally Posted by cruiser54
Not for your engine but just follow the basics.
Courtesy of TJWalker:
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
If it is the same as my 05 TJ the IAC is different than what I had on my 99. The 05 has only one mounting screw . It is not easily seen because it is on the bottom of the IAC. Once removed unlike previous years the seat and the valve will come out . it will be located between two O rings . Clean the same as any other year but some can't seem to locate the mounting screw don't be surprisred when it don't look like the older style . Its kind of nice being if you need to replace it you will also be installing a new seat as part of the assembly unlike the older IACs
O5 Rubi TJ, 3" BDS, Currie Currectlync, Rokmen BL , Savvy control arms w/Mc Duroflex Joints, JJ's lower front arms , Bilstein 5100, 33" Cooper STTs, Mc Track Bar