IAC, TPS and Trittle bodies:
 

Well, figured out last night that the IAC motor was bad and the throttle body needs a first class cleaning.


For those with the experience, would you either recommend or otherwise suggest a full TB cleaning through an R&R, TPS replacement along with the IAC, or how would you go about it?

I would not replace the TPS unless it is acting up too. as far as cleaning I would pull it from the manifold and use throttle body cleaner and an old tooth brush to clean off the tough stuff. If you want to dip it in a parts washer then you will have to re-grease the bearings for the shaft at both ends. make sure you clean out the were the IAC mounts to this is were the tooth brush will really help.

Are there additional o rings in the IAC cavity?

nope just the one that is on the main body of the IAC. The inside of the bore has a slight taper on it to match the end of the IAC but that's it.

Changed out the IAC... OMG what a difference!!!!!




She has never run that good before!!!








Now...




I switched out to a new IAC, but she is still idling high... Around 1200 rpm..


What's next to drop the idle?

The computer should be able to automatically adjust the idle to the correct rpm... unless you scewed around with the pintle on the end of the IAC... Dont mess with it:excl:

Negatory on the pintle.


just put it in. The old IAC looked like it was suffering from permanent Viagra-itus.


Now following the rules, and if I understand this correctly:


Pull the pos. side cable and ground it to de-energize the caps in the computer.
Then re-attach, turn the ign. to "On" but don't start, then turn on and turn off the lights once and turn the ig. back to off and that should clear the memory..
Correct?

Something like that... Seems like everyone has a slightly different way of doing it... Personally, I just disconnect the battery and let it sit for a few hours while I work on something else.

What year is your jeep?

'92

Excellent question...........

Yeah, I asked because if it were a renix era jeep I would have referred him to your very helpful link :)

And if it's not, I would have suggested removing the throttle body to perform the service because it's easier that way on an HO...LOL.

Just throwing this out there... I make throttle body cleaning a yearly maintenance item; not just on my jeep but all my vehicles. It's cheap and easy preventive maintenance, so just add it to your yearly to-do :thumbsup: