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Thread: What is Normal IAC Behavior?

  1. #1
    Electronic Ignition!
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    What is Normal IAC Behavior?

    Looking at my datalogs and the ee definition file, I'm trying to determine if what I'm seeing is normal or not. The IAC counts are much higher than the park position with the additional counts from the adder tables. The iac counts appear to rise and fall with a change in rpm even though temp remains constant. Reading the help tips makes me think that anything above idle, the IAC should go to park position for the coolant temp. This is on a 95 lt1 corvette. Any insight?

  2. #2
    LT1 specialist steveo's Avatar
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    at idle the iac follows rpm feedback to attempt to maintain idle speed.

    off-idle, depending on your calibration, the iac uses various "followers", vehicle speed and/or tps driven. in general, driveability improves with a bit of "minimum airflow", which is the whole purpose of the iac valve

  3. #3
    Electronic Ignition!
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    That is what I'm trying to improve is part throttle drivability. My thought was to increase the opening of the IAC to help distribute air more evenly at lower RPM. By reading the descriptors on Tunerpro, I was thinking it parked at a set value based on temp and modifiers for gear position, AC, etc. I do not see a table that relates it to RPM. Am I missing it or looking in the wrong place?

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