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Thread: Can IAC motor cause problems?

  1. #1

    Default Can IAC motor cause problems?

    Hi. On idle warmed up IAC is about 2%. Drove a bit and at 1700 RPM the IAC shows suddenly 68%. Restart, but now the idle I barely working and IAC shows around 64%. Now AFR shows 35 the cars stalls. The Innovate Lambda sensor shows 9.5-10.1 AFR is in nearly the same position. With an external gauge. So it's basically overfueling. Let it cool down, but the same, 35 AFR and IAC 68%. Went into advanced tuning IAC and played around with the graph. The IAC moves the piston back and forth. Pulled the IAC away from the Sniper unit. And the tip nearly fell out. Can all this malfunction be caused by a bad IAC? Regards, Rob

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,470

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    Replace the IAC motor. Troubleshooting a tuning issue is much more difficult with a defective IAC motor.

    Originally Posted by Danny Cabral
    Sniper EFI Replacement Sensors - Auto Parts Store
    CTS Sensor: Standard Motor Products TX3
    TPS Sensor: Standard Motor Products TH191
    IAC Motor: Standard Motor Products AC416
    WBO2 Sensor: Bosch 17025, 0258017025 (LINK/LINK/LINK/LINK)
    (The Sniper EFI 2 bar MAP sensor is internal with the ECU.
    The Sniper EFI IAT sensor is a circuit board sensor that measures one throttle bore.)
    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.

  3. #3
    Join Date
    Nov 2014
    Location
    Ont. Canada
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    1,575

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    I'd also look at a bad WBO2 sensor. It should not be reading 35 AFR.

  4. #4

    Default

    Hi. Thanks Danny. The WBO2 sensor was brand new, so it got destroyed in five minutes of driving. Anyway to check for faulty ECU? But the Innovate WBO2 sensor is still working. TPS sensor is also new, so is the CTS sensor. Regards, Rob
    Last edited by Mach173; 03-24-2020 at 10:20 AM.

  5. #5
    Join Date
    Dec 2009
    Location
    Connecticut
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    25,470

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    Quote Originally Posted by Mach173 View Post
    Hi. Thanks Danny.
    You're welcome.
    (Please don't type your posts like you're texting. It takes me a long time to edit it. At least use Spell Check before posting.)

    Anyway to check for faulty ECU?
    If you think you have a defective ECU, contact Holley Tech Service (LINK).
    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.

  6. #6

    Default

    Okay, thanks for the help. Regards, Rob

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