Results 1 to 13 of 13

Thread: 2018 ZL1- how do I turn off catalyst light off on cold starts?

  1. #1
    Tuner in Training
    Join Date
    Jul 2007
    Posts
    12

    2018 ZL1- how do I turn off catalyst light off on cold starts?

    I removed the cats and disabled COT, but I hate the sound of cold starts while the Cats are warming up. The combination of my exhaust and no cats makes it crazy loud. How do I disable the cat light off?

  2. #2
    Tuner in Training
    Join Date
    Mar 2018
    Posts
    47
    Go to Engine, General, Catalyst.
    Raise the enable to 490 fahrenheit and disable to - 140 fahrenheit.

    Then, go to Engine diagnostics, Exhaust, Disable catalyst test.

  3. #3
    Tuner in Training
    Join Date
    Jul 2007
    Posts
    12
    I don't have that option in mine. Under engine and general there is only engine displacement options and that's it.

  4. #4
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,173
    It's under Exhaust tab now

  5. #5
    Tuner in Training
    Join Date
    Jul 2007
    Posts
    12
    Quote Originally Posted by Higgs Boson View Post
    It's under Exhaust tab now
    The only exhaust tab I have is under Engine Diag. There I have the Catalyst Test (which I can disable) but don't have anything else. I assume this is to disable the actual OBD testing of the cats, but not the initial warm up(light off). Correct?

    Where would that be?

  6. #6
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    8,355
    Post the file..
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  7. #7

  8. #8
    Tuner in Training
    Join Date
    Jul 2007
    Posts
    12
    I hope that works. I've never done this so please bare with me.

  9. #9
    Tuner in Training
    Join Date
    Jul 2007
    Posts
    12
    So I found it. I had to search for it in the parameter navigator and it's in a hidden folder called exhaust. This folder doesn't appear anywhere else for some reason. Really strange. Thanks all.

  10. #10
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,173
    you are probably using Basic view. Change your setting to Advanced

  11. #11
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    8,355
    He is right, it's not listed under the regular exhaust tab even in advanced view.

    If you look in the navigator there is an exhaust folder there that has it. Both the regular and beta version on my computer show it there. My beta is the latest as of today, so 4.4.4X.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  12. #12
    Tuner in Training
    Join Date
    Jul 2007
    Posts
    12
    Quote Originally Posted by Higgs Boson View Post
    you are probably using Basic view. Change your setting to Advanced
    Nope, I've tried both basic and advance. I can only see the Exhaust folder in the Parameter Navigator. Wired stuff.

    Worked like a charm though.

  13. #13
    Senior Tuner Higgs Boson's Avatar
    Join Date
    Mar 2010
    Location
    Texas Hill Country
    Posts
    3,173
    interesting