Idle Air Controller - Trying to Clean for Rough Idle - Need Help - JeepForum.com

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post #1 of 22 Old 08-22-2008, 08:33 PM Thread Starter
JBWood05TJ
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Idle Air Controller - Trying to Clean for Rough Idle - Need Help

I have been experiencing rough idle and a little sputtering just as I press down on the throttle. Runs fine once I'm up over about 900 - 1000 RPM.

I've seen Jerry, Wheelin98TJ, and others post recommendations to clean the IAC plunger, and I'm finally trying to get to it tonight.

Here is the picture of the throttle body Wheelin98 posted in another thread, and it looks pretty much the same as the picture in my FSM:



My problem is this: notice that where the label points to Idle Air Control Module, the arrow points directly at one of two Torx screws that are supposed to hold the IAC to the throttle body. My IAC does not have these screws. And no, they're not missing - there are no holes for these screws. I see where the IAC is two pieces, with one side cast into the throttle body. Does the IAC module thread into the throttle body on my 2005?

I don't want to force anything, and I don't want to remove the TB if I can avoid it and then have to replace the gasket.

Your guidance is much appreciated.


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post #2 of 22 Old 08-22-2008, 09:23 PM Thread Starter
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Anybody have any advice? I'd like to try to get this knocked out tonight if I can.

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post #3 of 22 Old 08-22-2008, 09:27 PM
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That pics looks to be the same as my 04
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post #4 of 22 Old 08-22-2008, 09:33 PM Thread Starter
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Yeah, I know - and it shows pretty much the same as the pic from my '05 FSM. But I'm telling you - the screws aren't there. I have a tendency to be a bull in a china closet - so I'm trying to hold off until I get some advice.

I'm going to go take a picture of it and post it.

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post #5 of 22 Old 08-22-2008, 09:42 PM
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Can you take a pic of it ?
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post #6 of 22 Old 08-22-2008, 09:53 PM Thread Starter
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OK, here are a couple of pics. You can see that I've disconnected the elctrical connections for the IAC & TPS. The IAC module is complete cylindrical, no screws - not even the ears for the screws as shown on the diagram I posted.




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post #7 of 22 Old 08-22-2008, 10:07 PM
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Yea thats must have been a change in 05 , how bout bolts that hold it to the throttle body Can't see if it has any at that angle and if it did it would be a pita to get off with out having the TB off.
looks liek it may turn off But that could just break it
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post #8 of 22 Old 08-22-2008, 10:13 PM Thread Starter
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No screws or bolts on it. But I'm afraid of breaking it. If it's threaded in, I don't know which way it turns, or how tight it is. I don't know how strong the bolt ears hold the throttle body down are, being that they're cast. And I don't want to take the throttle body off if I don't have too because of the gasket. The stealerships around here never have jack, so I'd have to wait for it.

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post #9 of 22 Old 08-22-2008, 10:24 PM
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Where the red lines are there bolts holding it to the yellow line in is it 1 big assy ?
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post #10 of 22 Old 08-22-2008, 10:42 PM Thread Starter
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No sir. The throttle body is one cast piece back to the split that you see there next to the red line you drew on the right.

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post #11 of 22 Old 08-22-2008, 10:54 PM
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Well it Turns out or it dont come out Im Baffled .
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post #12 of 22 Old 08-22-2008, 10:59 PM Thread Starter
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Me too. I'll see if anyone else has and idea before I go at it. Like I said, I have a tendency to be a bull in a china closet sometimes. Plus, I'm not sure what I'd turn it with. Pipe wrench?

Thanks for trying to help out, man. I appreciate it.

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post #13 of 22 Old 08-22-2008, 11:03 PM
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Yea wait for some one to chime in that has done this type before you go and break you IAC
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post #14 of 22 Old 08-23-2008, 12:12 AM
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You can reuse the TB gasket. I've pulled mine off several times and I've had no vacuum leaks. Just be kind to it.

For the IAC controler, in your pick it looks like there is a flat spot cast into the IAC itself. My guess is that its for a wrench and that it screws in.
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post #15 of 22 Old 08-23-2008, 07:23 AM
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My 06 is the same as yours, there is one torx screw down low on the fuel rail side. The IAC has 2 o-rings on it, and will feel like it should not pull out. Just pull it straight back and hard.
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