[JanKristian]

I tried once to clean it, however I have a question. How did you manage to fit a screwdriver inside, there is almost no space there. I gave it up, since it did not manage to loosen the bolts.

[E-rok]

Originally Posted by JanKristian

I tried once to clean it, however I have a question. How did you manage to fit a screwdriver inside, there is almost no space there. I gave it up, since it did not manage to loosen the bolts.

3/8" ratchet with a torx socket.


every jeep owner should have a torx socket set up to T-55 both 3/8" and 1/2" drive

[hdrocknroll]

Take off the whole throttle body ,takes 5 min

[porphyry]

Originally Posted by JanKristian

I tried once to clean it, however I have a question. How did you manage to fit a screwdriver inside, there is almost no space there. I gave it up, since it did not manage to loosen the bolts.

To remove the throttle body, I used a 3/8" breaker bar with a ratchet adapter attached to it, along with a 4" extension and a u-joint socket (8mm, I believe). Once I removed the throttle body, I used a torx bit with a 6" extension and a t-handle (all in 1/4" drive) and a ratchet adapter. It was cake. Ratchet adapters, breaker bars and t-handles always help. So does a complete set of torx sockets. If you're gonna own a Jeep, invest a little cash into some nice tools. You'll get your money back pretty quickly. Good luck, and don't forget to disconnect your battery!

[darkesha]

I cleaned up mine after reading thread.
I had my jeep all of a sudden stalling and can't get it to run unless I keep stepping on gas pedal while turning key.
Before that I haven't noticed any kind of problems with idle or any other trouble.
I thought it was a one of the sensors but I tried friend's (he has 3 spares) and it was the same.

Anyways, since cleaning was finished I broke the gasket and I wonder where can I find gasket now ?
And was it supposed to be stiff like it was made of plastic ?

p.s. cleaned up mine, works ok...a bit rougher then before though. Gasket found at AutoValue, cost $3

[mflour]

I did this IAC cleaning outlined in this writeup. I really think it fixed my idle problem. my IAC was very very dirty just like the one in the picture. occasionally on cold starts my car would start then not catch idle and die I thought it may be transmission or something else.. Now after this cleaning it idles strong. Thanks so much for this tip.

~mflour

[zjridah]

Thanks for the write up.

[BigDaveZJ]

How quickly is the IAC suppsed to react to changes in throttle? Trying to solve a rough idle issue on a 97 I picked up. Cleaned the IAC thoroughly and it didn't help much. Swapped the IAC over from my 95 and it may have gotten a little better, but the plunger seemed slow to respond to changes in throttle. After revving it up and then letting off it would take a second before the IAC plunger would react. Thinking my problem may lie in the wiring??

[Natej_85]

When i did the IAC and throttle body it smoothed my idle immediately. I also sea foamed the ol girl too so it may have been the combination of all of that. Wiggle your pcm harnesses while its running, any change in idle and theres your problem.

[bigbill888]

Big DAve: Here is my experience with IAC. I had idle problems on my 96 ZJ. I cleaned up the IAC real nice, no difference really. I checked the wires from the IAC to where they connect to PCM, the wires were fine. I purchased and installed a new IAC, again no difference. WHAT???. As it turned out, when I jammed the lead from my digital multimeter into the plug at the IAC the cavities within the plug deformed just a little. After I straightened out the plug with the tip of a knife that fixed my idle.

[BigDaveZJ]

That's all fine and dandy, but how fast is the actual plunger supposed to move and react to throttle changes?

[ratmonkey]

Originally Posted by BigDaveZJ

That's all fine and dandy, but how fast is the actual plunger supposed to move and react to throttle changes?

It shouldn't react to throttle input changes it should stay at home/closed.

It only moves a very small amount. And doesn't go all that fast.

[bitbrat]

Chalk me up as another success story. The Cherokee suddenly wouldn't keep running in idle once it had warmed up. It's 15 degrees here so that took long enough that you were too far from home ...... at least my wife was.

The CEL had come on a while back, and I never dealt with it thinking it was an EVAP leak (long story, needs work) but when I read the codes there was a P0155 about a bad heater circuit in an O2 sensor. Talk about misleading - I realized that the O2 heater wasn't going to affect operation in closed loop,...

then I saw this thread! My IAC was caked in black gunk - it cleaned up nice, and I got some other junk out of the manifold while I was in there - she's back to running smooth now.

Thanks!

[Gibby913]

Great Write-Up!