Throttle body and IAC cleaning question.

I have a 1999 six cylinder and was wondering how to clean the throttle body and IAC.

I disconnected the plastic hose on top the throttle body and looked down the cylinder and noticed black deposits in the center around the metal flap(Don't know the technical term).

I have throttle body & air-intake cleaner. Do I need to take off the whole throttle body.

It looks like it is on with 4 bolts, but do I have to disconnect the 2 linkage cables also, because I would rather not mess with those?

Is the IAC right next to the TPS or is it that rectangle box on the side?, not sure? Do I just remove the IAC clean and re-install?

Thanks all, Just want to make sure I do it correctly.

If you take the intake hose off the throttle body and look around there should be whole in the side wall, if you look straight back from that on the outside of the throttle body will be the IAC. unplug it and remove the 2 screws then pull it out make sure not to turn push or do anything to the rod that comes off the IAC. Get a toothbrush and some throttle body cleaner and go to town on the IAC and the hole in which you removed it from. Then take a screwdriver and hold open the flap in the throttle body so you can clean it in the same manner with the toothbrush and throttle body cleaner. put it all back together and crank it up you should be good to go.

The Idle Air Control (IAC) is mounted on the back of the throttle body. 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

Reinstall IAC and check idle quality
　

Thanks for the help, I did it today. It was really easy.

I took the whole throttle body off and clean it along with the IAC with throttle body cleaner.

Looked like new when I was done.

Idle is much better, I'm going to finish the job with a tune up, spark plugs, wires, cap and rotor.

She should be running like new after that.

Thanks again for the help.

For posterity, NEVER spray cleaner or water on the TPS. The shaft is poorly sealed and getting it wet is a sure recipe for buying new one.