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Thread: IAC steps very high.

  1. #1
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    Default IAC steps very high.

    Alright, so I have been doing a bunch of reading and most people are saying, even with a cammed engine I should have about 50-60 steps on the IAC at idle.

    I am seeing about 120-150 steps. If I force anything less with DVT, the engine immediately dies. What could cause this? I know I have a larger cam, but I have seen guys with larger or equal cams to me and they aren't this high on IAC steps.

    Cam is Comp 230/238 .600 .603 @ 114.

    Any ideas from latest logs?

    Log_0011.efi

    Log_0010.efi

  2. #2
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    What intake and throttle body are you running?

  3. #3
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    Stock truck intake and stock 78mm TB.

  4. #4
    Lifetime Member minytrker's Avatar
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    You'll have to adjust the TB open some more in order to lower the IAC steps.
    99 Z28 Camaro|LS1 Heads & cam Tuned by LSX Power Tuning
    2003 CC Duramax Dually|19.5 w/245/70/19.5|Tuned by LSX Power Tuning|5in exhaust
    2009 G8 GT Vararam CAI|Tuned by LSX Power Tuning|GXP Mufflers|Custom System
    2006 CTS-V K&N CAI|OBX Headers|Cammed LS3|Tuned by LSX Power Tuning|

  5. #5
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    I am in a 2000 Silverado. It doesn't really have a TB adjustment. It is a DBW.

  6. #6
    Lifetime Member picnic_george's Avatar
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    If it's DBW there is no IAC hence no IAC steps to count.


    I don't think 2000 silverados came DBW????

  7. #7
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    Some pre-2003 Trucks were DBW. If it is a 2000 model, then it probably uses OS12205612.

    Take a look at the idle airflow values - generally these need to be increased slightly with a larger (non-OEM) camshaft. Start with B4307 and B4308 - then look at the corrections parameters if you are still having issues.

  8. #8
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    Sorry guys, it is DBC. My bad. I have got the idle airflow values to where it idles perfectly driving and cruising, but I am still at 150+ on steps.

    Here is latest log and tune.

    Sleeperado v1.0.ctz

    Log_Drive.efi

  9. #9
    Lifetime Member johnv's Avatar
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    If it drives and idles fine, leave it alone.
    If not crack the throttle stop open until counts are down around 30-50, be careful not to go too far or TPS volts may go out of range, (you may have to do a TPS reset) .
    Then log and adjust Running airflow again.
    Back yard boost
    347+ T76 = 770 rwhp 10.96 @ 135 mph

  10. #10
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    I agree if it runs and drives fine. Leave it alone. Don't get to caught up in the counts.

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