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Thread: IAC is working/commanding properly?

  1. #1
    Senior Tuner
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    IAC is working/commanding properly?

    Ran into this before but cant remember what I found the cause to be

    01 truck ECU, command 2000 rpm idle and timing goes up trying to raise but IAC count does not. Command 0 rpm idle timing goes to min trying to lower but IAC doesnt respond

    TPS does respond with pedal, no ETC flag in system menu

    It will raise IAC counts upon startup and once startup airflow decays to 0, IAC count will stays the same no matter what desired idle is if its higher or lower??
    Attached Files Attached Files
    Last edited by GrannySShifting; 01-12-2019 at 10:47 AM.
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  2. #2
    Senior Tuner
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    Anyone?
    Attached Files Attached Files
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  3. #3
    Senior Tuner LSxpwrdZ's Avatar
    Join Date
    Dec 2008
    Location
    on the Dyno
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    1,825
    I would first start by changing the transmission type back to what it originally was set to in the OEM stock file. I've experienced weird issues when changing that drop down for trans type.
    James Short - [email protected]
    Located in Central Kentucky
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    2020 Camaro 2SS | BTR 230 | GPI CNC Heads | MSD Intake | Rotofab | 2" LT's | Flex Fuel | 638rwhp / 540rwtq
    2002 Camaro | LSX 427 | CID LS7's | Twin GT5088's | Haltech Nexus R5 | RPM TH400

  4. #4
    Senior Tuner
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    Quote Originally Posted by LSxpwrdZ View Post
    I would first start by changing the transmission type back to what it originally was set to in the OEM stock file. I've experienced weird issues when changing that drop down for trans type.
    Ill have to try that with another car, I fixed the problem in this car swapping ECUs to another of the same hardware ID, and literally copy and pasted same exact table data in everywhere including that trans tab (it came to me like that and I didnt think about it since its a TH400 car)
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere