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Thread: 2003 ETC 4.8L Vortec - Initial idle

  1. #1
    Member 1BadAction's Avatar
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    Default 2003 ETC 4.8L Vortec - Initial idle

    When I first load the tune, the ETC seems to be parked a little bit to low. It stalls out sometimes and takes 50 or so almost-stalls before it learns where it should be. Meaning, when slowing down, foot off the gas, the idle drops down to 400 or less RPM and sometimes it catches it before it stalls, sometimes it stalls out totally. I've seen this being discussed on here before but can't find the thread via search now. Engine is bone stock, what can I adjust in the tune to rectify this?


    2013 1SS/1LE Blue Ray Metallic Camaro - DD
    1991 2500 Suburban - Roller cam'd high compression 454ci BBC tow monster
    1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
    1984 18' Contender Tunnel/2.4 Merc ModVP

  2. #2
    Member 1BadAction's Avatar
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    BTW - This truck has always done this, even when I first got it, I used to dread disconnecting the battery because it would act up when the learning was reset.


    2013 1SS/1LE Blue Ray Metallic Camaro - DD
    1991 2500 Suburban - Roller cam'd high compression 454ci BBC tow monster
    1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
    1984 18' Contender Tunnel/2.4 Merc ModVP

  3. #3
    Lifetime Member BLK02WS6's Avatar
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    You can increase B4307, desired airflow. That will effect the idle sitting still and moving. If you get it straight sitting still, but the idle when coming to a stop still needs work, you can use B4309, throttle cracker, to change that. Hope that helps...
    GM EFI Tuner
    02 WS6 9.41 @ 143 MPH 3675#, drag radials, pump gas, through the mufflers - sold


  4. #4
    Member 1BadAction's Avatar
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    Thanks man, that's the table I wanted. I'm going to clean the maf and the TB today and if it still does it I'll go ahead and tweak that airflow.


    2013 1SS/1LE Blue Ray Metallic Camaro - DD
    1991 2500 Suburban - Roller cam'd high compression 454ci BBC tow monster
    1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
    1984 18' Contender Tunnel/2.4 Merc ModVP

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