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Thread: Open loop commanded afr stuck at 13.98 / 0.952 lambda... is that normal?

  1. #1
    Tuner in Training
    Join Date
    May 2020
    Posts
    13

    Open loop commanded afr stuck at 13.98 / 0.952 lambda... is that normal?

    Hey all,

    I am tuning my 2008 trailblazer wit a 4.2 and the e67 ecm

    i set all othe o2 readyness to 400deg and have disabled ltfts in the tune. I unplugged the front o2 and replaced with wideband.

    After its all warmed up i see it throws the o2 code because its not plugged in and the arf/eq commanded sit at 13.98/0.952.

    Is this normal? I usually tune my gen 3 2002 trans am race car but i have a bung so i dont replace the front o2.

    I figure its fine since im just doing maf and sd error based on what the computer commands and the actual but was still odd.

    just wanted to make sure its not going into some limp mode and causing errors

    Thanks!

  2. #2
    Senior Tuner
    Join Date
    Nov 2006
    Posts
    2,712
    It is coming from the OL tables. Not all of them go to EQ = 1 warmed up.. Some stay a slight bit rich.
    Tuner at PCMofnc.com
    Email tuning!!!, Mail order, Dyno tuning, Performance Parts, Electric Fan Kits, 4l80e swap harnesses, 6l80 -> 4l80e conversion harnesses, Installs

  3. #3
    Tuner in Training
    Join Date
    May 2020
    Posts
    13
    Ya i finally figured it out from another post. dont go leaner than 1.05 commanded in this truck. ficked for tning now thanks