Skydawg

Installing a GM MEFI 5 ECM on cable throttle, so need an IAC. The MEFI 5 seems not to work with the GM style as its only capable of an open or closed signal. The GM IAC seem to be 4 wire stepper motors (more than just open/closed) whereas the older Ford are 2 wire- either open or closed solenoid. Since the throttle body is fitted for a GM IAC I can't simply install the Ford. Question is, anyone ever try wiring a GM to be 2 position? Thinking maybe I can only use 2 of the 4 leads.

pantera_efi

iTrader: (1)

Hi, the GM IAC & Holley IAC are a Stepper Motor design.
Coil A&B diver open, coil C&D drive close.

Much different than a solenoid.

Thus=NO
Lance

Krom

Mercruiser used a ford iac valve with hoses.
With a little fabrication it would be easy to copy.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1



just make a block to bolt it to, tap it for 2 hose barbs, run one hose upstream of the throttle plate, and one downstream

here is how merc does is

CBM Motorsports

iTrader: (2)

We just happen to make a fitting that goes in the factory IAC location on the throttle body that converts it over to a 3/8" hose barb. We use these on all of our MEFI 5 systems. We also carry a 2 pin IAC with a remote mount bracket that has 2 more 3/8" barbs coming out of it. It is a nice simple little setup that would solve your problem. Let me know if you need some more info on how we do it!