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Thread: IAC steps.

  1. #1
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    Default IAC steps.

    I am having some issues with my IAT steps.
    I was informed that mine should be around the 30 mark at idle when warm but Im seeing them average around the 7 mark and sometimes my TP is at 0.4 but mostly at 0.0.

    What do I change (and perhaps by how much) to get my iat's to increase to the 30 figure as was suggested (by someone with far more experience than me)

    Is it B4307??
    HX Ute.

  2. #2
    Lifetime Member TAQuickness's Avatar
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    I'm assuming you ment IAC (Idle Air Control) instead of IAT (Intake Air Temperature).

    In the case of IAC (on cable actuated TB's), the goal is really to give the valve enough room to control idle. IMO, 30 steps is a bit on the low side. Stock the IAC count is about 60 steps at hot idle.

    An IAC count of 0 steps means the IAC valve is closed. A count of 310 steps is 100% open. In your case, 7 steps, the valve is almost closed, indicating too much air is getting past your TB at idle. To correct this, you will need to adjust the set screw to allow the TB blade to close more. If the set screw will not fix it's because the TB blade hole is too large, you may need to replace the blade and drill a smaller hole.
    Last edited by TAQuickness; January 7th, 2007 at 12:51 AM.


  3. #3
    Lifetime Member TAQuickness's Avatar
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    FWIW, My hot idle is about 70 steps.


  4. #4
    EFILive Crew Site Admin Tordne's Avatar
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    Mine is around the 40 mark which is fine. Your's is way to low thought.

    You may need to adjust the throttle body set screw (close the throttle I think). You will also need to do a TPS reset after that.
    Andrew
    EFILive Crew


  5. #5
    Lifetime Member TAQuickness's Avatar
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    Good catch. Forgot about the TPS reset.


  6. #6
    EFILive Crew Site Admin Tordne's Avatar
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    Changed Title of thread to IAC Steps
    Andrew
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  7. #7
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    Yes definately IAC steps not IAT.
    Sorry.As someone said b4 Brain fart.

    Ill make sure the TB blade is closed fully, as the set screw can be adjusted further down.
    Reset the TPS switch and then log to see IAC steps.

    If its still low how do I increase the steps to something close to 30ish. Do I increase B4307?
    HX Ute.

  8. #8
    EFILive Crew Site Admin Tordne's Avatar
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    See how you go with the set screw before deciding what else might be required... The IAC steps can change quite a bit with small changes tot he set screw.
    Andrew
    EFILive Crew


  9. #9
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    Yeah will do Andrew. I was just reading a couple of older posts regarding this very question.
    Im onto it.
    HX Ute.

  10. #10
    Lifetime Member Doc's Avatar
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    If you haven't already, do a search on RAFIG and RAFIPN which stands for running airflow in Gear / Park/Neutral

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