GM IAC vs. Ford IAC

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Oct 4, 2016 | 11:10 AM

Skydawg

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Staging Lane

Joined: Jul 2015

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GM IAC vs. Ford IAC

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.

Oct 17, 2016 | 11:57 AM

pantera_efi

FormerVendor

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Joined: Nov 2008

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From: Santa Ana, CA. USA

GM Stepper IAC

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

Oct 17, 2016 | 05:37 PM

Krom

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Joined: Sep 2006

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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

Last edited by Krom; Oct 17, 2016 at 05:48 PM.

Oct 19, 2016 | 02:58 PM

CBM Motorsports

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From: Rancho Cucamonga, CA

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!

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