Can someone please tell me how to adjust the IAC on my 2.5 Duke.. I do not know weither it pushes in and out, or weither it spins in and out.. if it I'm wrong all together! Thanks guys!

There are two different types. One you can pull the spring back and turn it in and out, the other you can kind of rock it back and forth while you push in on it.

Another way is to run it in and out while you have the engine running.

See my post in this link how to do it about a 1/4 of the way down.
//www.fiero.nl/forum/A...060811-2-073281.html


You use your finger to vary the amount of air being sucked in which will change the engine idle. Slow the idle down and the pintle will pull in. speed it up by allowing more air in and it will move out. When you get it where you want it have someone turn the engine off.

Takes a second to get the feel of letting the air in but once you get the hang of it, it's kind of fun to play with the speed.

Don't want to do it with a hot engine of course.

[This message has been edited by Dodgerunner (edited 04-21-2008).]

I know that there are two types. But I don't know which one I have. I don't seem to be able to make this thing budge either way. Its off a 87 2.5L Duke. So if anyone knows how to adjust the IAC on that engine. any further help would be apprecaited

The "adjustment" on the IAC is only for the initial installation to make sure the pintle doesn't jam in its seat when the IAC is screwed into the throttle body. The ECM will control where the IAC is positioned after the car has been driven a while. You need to unhook the battery for about 30 seconds or so to clear the memory in the ECM. Then, take the car for a drive at least until it is warmed up and you have gotten the speed above 40 MPH or so. This will reset the ECM and it will learn the new idle adjustment on the IAC. Until then, your idle may be incorrect.

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Rod Schneider, Woodstock, Ga.
"You can't have too many toys!"
1988 Fiero GT
1966 Porsche 911
Van's RV-6 airplane-under construction

To reset the IAC to fully closed do this: place a paperclip in aldl terminals A&B to put the car in diagnostic mode, turn the key to RUN (do not start it), wait 30 seconds for the ECM to drive the IAC fully closed, now pull the connector to the IAC, then turn the key to OFF, pull the paperclip out of the aldl ports and reconnect your IAC connector (in that order). By removing power to the IAC motor after it has fully closed the ECM knows exactly where the IAC pintle is positioned.

Terminals A&B are the bottom left two positions in this photo:

Paperclip like this:

I see thanks all for your help. Hudini you actully answered a bunch of my questions in that responce. I thought that was what that electrical connector was under the cigarette liter. But wasn't sure.. So thanks for all your help, I'll see if I can get this thing running better. Kyle.