Stand Alone systems and IAC - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 06-26-2015, 02:54 PM Thread Starter
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Stand Alone systems and IAC

I'm running the Holley HP, I guess this question could apply to any aftermarket standalone. What IAC are you running? I wanted to use the GM type but realized after buying the BBRC adaptor, that it pointed the IAC down into the valve cover or up into the hood. Seems like all the adapters will orient the GM IAC in that direction too.

I guess my best option is to us the Ford IAC and get the I/O harness for the Holley EFI so I can run the PWM Ford IAC.

Thoughts/suggestions?


1989 LX 5.0 - 333 Mexican block, Eagle 4340 neutral3.25" crank, Probe SRS 9cc dome .040 psitons AFR 185 Comp heads, FTI HR cam 239/244 613/613, Edelbrock Victor 5.0, 90mm TB, BBK 1 3/4, C4 and 4500 Circle D converter, 4.10 gears

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post #2 of 7 Old 06-29-2015, 09:26 AM
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I'm not running the Holley, but the Pro-M instead.
First i tuned the Pro-M with the IAC turned off, and tried to tune around it. As conventional tunning trends lean that way.
Then I started over and used the IAC. I purchased a new IAC from the Ford dealer, and my car runs better on cold starting than it ever has.

Not sure how much help that was, but the Ford IAC works when you use it correctly. That's all I know.
I don't see the need to switch to the GM, but rock on brother!


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post #3 of 7 Old 06-29-2015, 02:44 PM
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I see no reason not to use the stock Ford IAC valve. It's there already, and works great.

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post #4 of 7 Old 06-29-2015, 03:21 PM Thread Starter
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Meegs that helps a lot. The Holly EFI stuff from a wiring perspective is setup for a 3 wire stepper motor like GM uses. That means you need a to buy a $50-100 adapter plus a GM IAC for another $50 or so.

To run a PWM Ford IAC, you need an extra I/O harness for $60 plus a stock IAC plug. Then build you own IAC harness. The bonus is then I have the I/O harness for more I/O options in future and its cheaper.

I've been fighting cold start issue, so I think I'll be looking into getting the Ford IAC working again, right now its just plugging a hole.
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post #5 of 7 Old 07-08-2015, 10:23 AM
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I am usually a GM iac with my accufab throttle body, I purchased the accufab iac adapter and it points it down and towards the passenger side. Fits well and matches the TB.

Currently working on my cold start, with my holley HP as well.


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post #6 of 7 Old 07-08-2015, 08:22 PM Thread Starter
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Can you post a picture of the accufab adapter? The Behind bars adapter I had pointed it straight down into the valve cover but that may be partially because of my TB spacing.

ImageUploadedByAutoGuide1436401325.521698.jpg

1989 LX 5.0 - 333 Mexican block, Eagle 4340 neutral3.25" crank, Probe SRS 9cc dome .040 psitons AFR 185 Comp heads, FTI HR cam 239/244 613/613, Edelbrock Victor 5.0, 90mm TB, BBK 1 3/4, C4 and 4500 Circle D converter, 4.10 gears

2012 GT/CS 5.0 - Yellow Blaze Tri-Coat metalic, A6, HID.
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post #7 of 7 Old 07-09-2015, 12:35 PM
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I'm using the factory one with megasquirt and it can move plenty of air to control the idle on a 393.

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393w, Vic Jr 60cc, XE282HR, Victor 5.8 EFI, 80# injectors, Hooker LT 1 3/4 to 3", Borla proXS
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