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Thread: Why is my misfire detection not working? 3bar os

  1. #1
    Potential Tuner
    Join Date
    Jul 2010
    Posts
    8

    Why is my misfire detection not working? 3bar os

    I cannot get a misfire code to throw on my truck. Running 2003 stock ecm with hptuners and the 3 bar os upgrade. Ive been chasing a nasty misfire on my truck, but I cannot get it to throw a single code. Ive gone as far as unhooking plug wires, and still shows nothing. Is this just not available with a 3bar? How are you guys diagnosing a misfire with a 3 bar os? Tune isnt dialed in yet, but would anyone care to look over it to see if I disabled something?

  2. #2
    Senior Tuner Russ K's Avatar
    Join Date
    Dec 2005
    Location
    Regina, Sask.
    Posts
    4,213
    Misfire detection is disabled in SD mode. Enable the Maf to trouble shoot the misfire.

    Russ Kemp

  3. #3
    Potential Tuner
    Join Date
    Jul 2010
    Posts
    8
    Thank you very much. Re enabled the maf and it works great.