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Thread: (Question) Programming GM ECU to control Holley Chrysler style IAC.

  1. #1

    Default (Question) Programming GM ECU to control Holley Chrysler style IAC.

    My question pertains to setting my GM ECU (2001 style with cable throttle), to properly control the Chrysler style IAC that Holley uses in their throttle body model 112-588 (top mount 4150 type with 100 CFM). Question: When setting the ECU, do you set the start & idle settings the same as you would if Holley used a GM style IAC? I do have the IAC wired per Holley instructions. I appreciate any feedback on this. Thank you!

  2. #2
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    Quote Originally Posted by cwmusser View Post
    When setting the ECU, do you set the start & idle settings the same as you would if Holley used a GM style IAC?
    Yes. However, if you have a GM LSx IAC motor, you'd select "GM LSx" under Advanced Idle Control. Or "Holley Stealth Ram" if you have a GM TPI type IAC motor. The IAC Type will still be "Stepper".
    http://forums.holley.com/showthread....neral-IAC-Info (General IAC Information - Read "IAC NOTES")
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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    Danny, thanks for your reply. I'll admit that I read the "yes", but then got a little confused reading the entire response. To be clear, my IAC is a Chrysler style which comes standard in the Holley throttle body and the GM style will not fit (I tried changing it). My ECU is GM, so I'm trying to control the Chrysler IAC with a GM ECU. Are you saying "yes" to the programming being the same as if both ECU & IAC were GM as long as I have it wired per Holley instructions? I'm always concerned that the Holley information pertains to the Holley ECU systems and may be different when using a GM ECU. Thanks again, and sorry about being confused.

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    Quote Originally Posted by cwmusser View Post
    To be clear, my IAC is a Chrysler style which comes standard in the Holley throttle body and the GM style will not fit (I tried changing it).
    One of the Chrysler IAC motor mounting holes just needs to be slightly elongated with a Dremel tool for screw alignment: https://forums.holley.com/showthread...9323#post99323 (Related Forum Post)

    My ECU is GM, so I'm trying to control the Chrysler IAC with a GM ECU. Are you saying "yes" to the programming being the same as if both ECU & IAC were GM as long as I have it wired per Holley instructions? I'm always concerned that the Holley information pertains to the Holley ECU systems and may be different when using a GM ECU.
    "Yes" was in reference to the Holley EFI IAC software parameters (Holley EFI ECU). I don't have any knowledge about using a GM ECU.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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    This should help with the wiring:
    Click image for larger version. 

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