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Thread: STFT Bank 1 goes flat

  1. #1

    STFT Bank 1 goes flat

    Hi guys,

    I just hooked up a wideband to my 11 CTSV and I'm getting a random issue where STFT Bank 1 goes to 0 and stays there. In this specific log; you'll notice that it started off okay, but at around 2:57 into the log it dies out. The o2's are both running so I don't believe that it's mechanical. The wideband is an AEM 30-0333 and is in place where the rear o2 of bank 1 is. Car is catless.

    One thought I just had is that the rear o2 that I removed to put the wideband in is just ziptied and hanging there during tuning. If it comes into contact with metal; would it ground out and potentially cause this issue?

    **I can't figure out how to upload the file. When I click to add attachment, it goes through the motions, but it's not showing up

  2. #2
    I wasn't able to attach the original file that I wanted to, but I was able to attach this one which the STFT Bank 1 dies out at around 4:24
    Attached Files Attached Files

  3. #3
    Tuning Addict 5FDP's Avatar
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    May 2012
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    I've seen weird stuff like this happen when logging way too many channels.

    I think I counted like 73 channels you are logging. Try to cut that way down and see if it helps.

    For one example here, you are logging 2 different Alcohol/Ethanol channels and both read 0% and while also logging flex fuel advanced spark. Getting rid of those would be a good idea if you are not even using them. Or logging 4 different throttle position channels, maybe only two are required.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  4. #4
    Quote Originally Posted by 5FDP View Post
    I've seen weird stuff like this happen when logging way too many channels.

    I think I counted like 73 channels you are logging. Try to cut that way down and see if it helps.

    For one example here, you are logging 2 different Alcohol/Ethanol channels and both read 0% and while also logging flex fuel advanced spark. Getting rid of those would be a good idea if you are not even using them. Or logging 4 different throttle position channels, maybe only two are required.
    Good Call. I'll clean it up and see what that does. It can't hurt.
    Thank you