General IAC Info & Ford PWM IAC Wiring

[Danny Cabral]

You're welcome, 18 AWG is fine.

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I did see that, but thought that was for the Holley IAC, wasn't sure if the Ford unit I will be using needed a larger size. Thanks.

[Danny Cabral]

Yes, 18 AWG is fine. Always refer to the Holley EFI Wiring Manual. You'll see the IAC motor wiring is 22 AWG.

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Are 18 gauge wires suitable for the Ford IAC motor, or can I use something smaller?

[Danny Cabral]

Not necessarily. Select the setting that best fits your engine application.

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When using the Ford 2-wire IAC, should Advanced Idle Control be "5.0L Ford" or something else?

[Danny Cabral]

The Slow, Medium & Fast IAC PID/Blanking values are now listed in post #1.

[Bullshark]

Can any one tell me the PID IAC control values used when "FAST", "MEDIUM" or "SLOW" is selected in Advanced Idle Control? Thanks, Bullshark.

[Rage]

So ⁺/₋ 8°-9° spark timing is the maximum the Holley will use to control idle speed. The engine's previous Mercruiser PCM555 would use about four times that, is why I asked. Thank you.

[Danny Cabral]

It depends on how well the idle quality is tuned.
A good idle will only fluctuate the Idle Spark control about ⁺/₋ 2°-3°.
A poor idle can fluctuate the Idle Spark control as much as ⁺/₋ 8°-9°.
http://forums.holley.com/showthread....e-Tuning-Notes (Read "Idle Spark Control Tuning".)

[Rage]

RE: Parameters - Idle Spark
Description: Idle spark control will modulate the ignition timing at idle to assist with maintaining the target idle speed.

When the RPM at 0% TPS is above or below the Target Idle Speed specified per coolant temperature, how much IAC Idle Spark control spark advance/retard modulation does the Holley have available to use to control idle? I.E. override the Base Timing Table?

[procharged67]

Typical IAC Control/Ramp Down parameter settings.
Advanced Idle Control: ......................... Slow (Usually the best control.)
IAC Type: ........................................... Stepper (4-wire), PWM (2-wire)
IAC Hold Position: ................................ 10%-30%
Ramp Decay Time: ............................... 1.0-3.0 sec
RPM Above Idle To Start Ramp: .............. 1000 RPM (Or higher.)
RPM Above Idle To Re-enable Idle Control: 50-200 RPM (This setting can be finicky.)

Going to try this on my car to try & clean up the idle problems I have, instead of the custom setting. I'll try the Slow setting. I notice the box that shows PID is gone.

[ThePunisher2]

GM IAC Wiring on a 2000 Mustang with the Modular Mustang Holley EFI Harness:
I bought a GM Flat 4-wire IAC Pigtail, a 22 AWG 4 conductor wire, and 4 TE 3-1447221-4 pins to put in the J1B ECU connector.

GM IAC Pigtail:
A: Purple/White "B LO" > White wire of 4 conductor > Pin B8 J1B.
B: Purple/Black "B HI" > Red wire of 4 conductor > Pin B9 J1B.
C: Purple/Blue "A LO" > Green wire of 4 conductor > Pin B1 J1B.
D: Purple/Yellow "A HI" > Black wire of 4 conductor > Pin B2 J1B.

The GM IAC Pigtail has the letters A, B, C, D on it if you look real close.
The J1B connector also has the numbers on it if you look real close, makes it easy to know what white plugs you need to pull out with pliers to put in the new pins.

I stripped the wires back enough for the top clamp on the pin to be able to crimp down on it with pliers, and the lower clamp to clamp down on the actual plastic of the wire. I then soldered above and below the top clamp.

Then unplug the J1B and press the long white rectangle to release it so you can shove the pins up in it.
It's hard to do with 22 AWG wire. I seen some guys running thicker wire, which would probably help push them in. I had to get a small pick and press on the pin and push it real hard until you hear it click. I also verified by shining a light up on the pins, and making sure they were even with the other ones. Either way, when you press the 2 white plastic things on the J1B plug to secure the wires, they won't go in if you don't have them seated properly.

[Danny Cabral]

They have PIN B1, B2, B8 & B9 on the J1B harness plugged with white plugs as those are the IAC outputs for a GM.

Yes, remove those four white plugs.
Since you decided to use a 4-wire stepper type IAC motor, you'll have to install the four IAC wires to the P1B ECU connector.
http://forums.holley.com/showthread....neral-IAC-Info (Scroll down to "IAC Motor Harness Connector PIN-OUTS".)

I need to wire into the J1B plug to those 4 pins, and run 4 wires to the GM IAC actuator. How do I wire them into that J1B plug? What parts do I need?

http://forums.holley.com/showthread....als-Holley-EFI (ECU Connectors & Terminals)

I've seen you talk about Metri-Pack, looked like that was for the IAC connector and not the J1B. Thanks.

Correct, that's for the IAC motor itself, not the ECU connector.

[ThePunisher2]

I have the Modular Mustang HP EFI harness. They have PIN B1, B2, B8 & B9 on the J1B harness plugged with white plugs as those are the IAC outputs for a GM. I've switched to a GM IAC Actuator. I need to wire into the J1B plug to those 4 pins, and run 4 wires to the GM IAC actuator. How do I wire them into that J1B plug? What parts do I need? I've seen you talk about Metri-Pack, looked like that was for the IAC connector and not the J1B. Thanks.