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Thread: IAC runs up to 30% and engine races up.

  1. #11
    Join Date
    Aug 2015
    Posts
    4

    Default

    So the IAC you bought from Holley was a GM type?

  2. #12

    Default

    I measured 55.5 Ohms across B & C pins, looks like it's the right IAC motor. What would cause it to be open? Engine 400 above target idle and the IAC reading 0%? It died when I put my finger on it.

  3. #13

    Default IAC Open, O% Value Displayed.

    The Idle control seems fine until about a half hour of test driving. Can Heat Soaking affect these IAC motors? Is it better to get a replacement from Holley or Mopar? The IAC works fine on startup. Is 55.5 Ohms Resistance out of range? I just remeasured, both coils read 48.x Ohms. It had been parked an hour when I measured 55.5 last night.

  4. #14

    Default

    Might as well replace it just to see what happens. Could be a heat soak issue or it could be something else. I just replaced a MAP sensor that would act funny when it got hot. Now the car runs fine. Sometimes you just have to swap parts to see if it fixes it.

  5. #15

    Default

    My thoughts exactly! I'm just wondering if I can get a better product at NAPA or if they're all created equal?

  6. #16
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,631

    Default

    The Holley/Chrysler IAC motors have served me very well.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  7. #17

    Default

    Does anybody have a Mopar part number or a model & year of a vehicle that uses the same IAC stepper motor as Holley? Thanks.
    UPDATE: I found an old post, Standard Motor Products AC416!

  8. #18
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,631

    Default

    http://forums.holley.com/showthread....=2760#post2760 (Replacement Sensors For Holley EFI - Auto Parts Store)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  9. #19

    Default

    Thanks Danny, I ordered a Holley and a Standard Motor Products IAC motor. It's still idling high with zero % IAC reading. The idle timing is 25° and the Idle Spark control is pulling it down to 18° trying to slow it down. I really think popping in a new one will do it. I'll post the results.
    Is there a bulletin board? There's a really cool YouTube channel HORSEPOWER HEAVEN 2. He just put it back up, I think he was getting his content Ripped Off. It's got great nostalgia drag Racing.

  10. #20

    Default

    Dynosore, sounds like you have a vacuum leak.

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