You can install a 3 wire and hack it.
I did this on my wheeler for an idle up switch for winch/jumpstarting.....
So this is how.
1. run 12v+ Ig. switched to the center pin of 3 wire IAC
2. Connect the center pin of a SP-DT Switch to ground.
3. Connect the other 2 pins to the IAC pins 1 and 3.
Now this is for the basic idle/up idle down.....When the switch is flipped one way.....the "OPEN" side(pin 1of IAC) is connected to ground so the gate swings open increasing idle. Flip the switch the other way, and the "closed" side is grounded (pin 3 of IAC).
Now this is the weird part.......The ECU will not like having no idle control...and will throw a code.......here's the hack for that
MT: Connect a small incadesant bulb...(turn signal or marker) between the Original 2 wires from the ECU to the IAC........this will keep the ECU happy mostly that it sees a load it thinks is the IAC vavle.
AT: Connect 2 small bulbs, (or a Dual filament bulb) Each bulb (or filament) shall be connected to a power source on one side.....and 1 each grounded by the 2 original IAC wires that come from pins 1 + 2 of the ECU....so the ECU sees 2 coil circuits it thinks are the IAC.
*NOte* When using the idle up function.......after a certain amount of time.....or whenever fully warm already......the ECU will CUT FUEL to the #1 cylinder at idle.......since it senses the idle RPMS are higher than it should be....but can't control it (it'll try....fun to watch bulb light and dim)
So this will result in a slight "loping" or "miss" with the throttle closed at idle.....but the switch flipped to "open" for idle up.......Will throw CEL during this time too but goes out after driving with switch "closed" for normal, warmed up, low idle.
Oh yeah and also you could just block off the ports for IAC and spend 30-secs with your foot on the gas till it warms up to idle and forget about it.
Edited by Gloyale, 13 August 2014 - 01:28 PM.