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Thread: IAC causing stall?

  1. #11

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    I think possibly I should've been more clear. I followed Holley's recommendations to setting idle & IAC. I achieved a good IAC of 5% at idle. I them turned off the car and restarted about 30 minutes later. At that point it still idled fine, but IAC showed 50%. I went to the engine bay with car idling and checked for vacuum at the IAC port, there was little to no vacuum. At 30% I could hear it hissing very easily. Controller was showing 50%, but it wasn't really acting like it was.

    I'll redo the IAC & idle setup, and see what happens.

  2. #12
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    290

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    Did you look down the IAC inlet hole to confirm the IAC plunger is actually moving? If the IAC is bad, it can act like what you're describing. Also, check the wiring in the plug to make sure all wires are connected.

  3. #13
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    15,277

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    If you think you need to replace the IAC motor: Holley 543-105 (Standard Motor Products AC416).
    If you'd like to eliminate the IAC valve as a problem, temporarily block off the IAC air inlet port with a strong piece of tape.
    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

  4. #14

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    No, I didn't think to look down the hole. I'll check it out once I get back in town.

  5. #15
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    15,277

    Default

    Yeah, the IAC motor pintle should be moving a little bit, even at idle.
    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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