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Thread: 1227747 - A little Help Please :-)

  1. #1
    Fuel Injected!
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    1227747 - A little Help Please :-)

    I have a few questions but I'll start with idle.

    I see IAC-Desired C/L Idle Speed table but that is only for in Drive.

    What controls the Desired C/L Park/Neutral Idle Speed.??

    I'm new to the old.. lol I've done plenty of tuning on the newer GM cars but not so much on the the older ones..

  2. #2
    EFI GearHead ! EagleMark's Avatar
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    Quote Originally Posted by MxRace75 View Post
    I see IAC-Desired C/L Idle Speed table but that is only for in Drive.

    What controls the Desired C/L Park/Neutral Idle Speed.??

    ..
    Pot luck! There's no real setting, it's aaround there.... it's really a poor idle specific RPM ECM...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  3. #3
    Fuel Injected!
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    I found this --> http://www.gearhead-efi.com/Fuel-Inj...pdated-12-4-00

    Has some pretty good info. I guess I'll just mess around and see what I can mess up ( I mean fix )

  4. #4
    EFI GearHead ! EagleMark's Avatar
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    Excellent article. You'll find the idle is always close to what is set too, but always a little off when not warm in gear.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  5. #5
    Fuel Injected!
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    I see in your sig that you have or had the same PCM. I can't believe how slow the data stream rate is (about 1 time a second) compared to my friends 95 burban (like 10 datapoints a second)

    Its gonna make for some choppy data.

  6. #6
    EFI GearHead ! EagleMark's Avatar
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    Yes it does but it has never stopped me from a perfectly fine running tune.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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