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Thread: 6.0 commanded afr

  1. #1
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    6.0 commanded afr

    totally new to this, fist post, could use some help

    stock engine aside from intake tube

    I get a weird a/f ratio occasionally. I see it on the wide band (not on the log as I don't know how yet) I notice that there is a corresponding weird commanded a/f in the log.

    Can someone tell me what i am looking at about 12min 25 sec..

    Feel free to point out any other stupid stuff in this tune if you see anything.

    1995 van 6.0 maf cal 002 done.hptdrive 002.hpl

  2. #2
    Advanced Tuner dhoagland's Avatar
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    Post up your Tune too

    EDIT, I see it
    2011 Camaro 2SS Convertible L99 Bone Stock for now
    2003 Dodge 2500 5.9 Cummins QC 4x4. Airaid, 2nd Gen Intake, Grid Heater Delete, D-Tech 62/65/12, Magnaflow. Bully Dog: Propane Injection, Triple Dog W/Outlook Crazy Larry. Edge EZ, BD Flow-Max, 48RE: Sonnax Sure Cure/Transgo combination, Derale turbulator, billet input, Triple Disc, Super servo, 4 ring Accumulator. :beer

  3. #3
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    It's very likely DFCO. You can add the DFCO PID to your channel list.

  4. #4
    Tuning Addict 5FDP's Avatar
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    That's a cat test because it goes from 16 afr down to 13 and back to normal.

    HP Tuners can't turn off that cat test. I got around it by installing the rear o2 sensors into the harness again and turning off all the codes, then just zip tied the sensors out of the way. The open circuits on the sensors is what causes the test to happen I'm pretty sure.
    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.

  5. #5
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    Quote Originally Posted by kevin87turbot View Post
    It's very likely DFCO. You can add the DFCO PID to your channel list.
    I have fuel system status, should I be using something different?

    There is a another funny spot at the end of the log where the fuel status changes... I just don't know what to make of it

  6. #6
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    Quote Originally Posted by 5FDP View Post
    That's a cat test because it goes from 16 afr down to 13 and back to normal.

    HP Tuners can't turn off that cat test. I got around it by installing the rear o2 sensors into the harness again and turning off all the codes, then just zip tied the sensors out of the way. The open circuits on the sensors is what causes the test to happen I'm pretty sure.
    so does it just test once? it seems like it happens once after warmup & then acts normal.

  7. #7
    Tuning Addict 5FDP's Avatar
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    Yeah it's usually once.
    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.

  8. #8
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    Quote Originally Posted by 5FDP View Post
    Yeah it's usually once.
    I guess i can live with that.

  9. #9
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    Quote Originally Posted by 5FDP View Post
    That's a cat test because it goes from 16 afr down to 13 and back to normal.

    HP Tuners can't turn off that cat test. I got around it by installing the rear o2 sensors into the harness again and turning off all the codes, then just zip tied the sensors out of the way. The open circuits on the sensors is what causes the test to happen I'm pretty sure.
    Yep! You're correct. I saw the commanded AFR of 16, but overlooked the 13.