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Thread: AFR drop too low when coming to a stop

  1. #1
    Tuner in Training
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    Jun 2019
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    AFR drop too low when coming to a stop

    Hey Guys,

    i've noticed that my AFR drops very low when i'm coming to a stop sometimes, that sometimes it goes so low between 10.8 to 12.9. it happens when i slow down for a road bump.

    is it something tune related or because of the disable brake booster hose that's connected to the intake pipe?

    car is a 2014 Auto with PMAS intake and a 2018 intake

  2. #2
    Advanced Tuner small tuner's Avatar
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    Nov 2015
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    post tune and log
    Turbocharged COYOTE

    PM for E tune / Remote Tuning
    [email protected]

  3. #3
    Tuner in Training
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    Jun 2019
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    unfortunately my car is SCT tune Based, i tuned it myself and the car is running perfectly except for this issue which is not causing me any disturbance or driveability issues, it just made me curious and i wanted to know if it's tune related or normal and maybe i never noticed it before.

  4. #4
    Advanced Tuner
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    Mar 2010
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    New Orleans, LA
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    is the msf period below idle maf period?

    if so reduce the maf

    otherwise it would be your injectors needing to be dialed in

    thats assuming your not in OL during decel with the fuel tables commanding rich
    decipha @ EFIDynoTuning
    http://www.efidynotuning.com/

  5. #5
    Tuner in Training
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    Quote Originally Posted by decipha View Post
    is the msf period below idle maf period?

    if so reduce the maf

    otherwise it would be your injectors needing to be dialed in

    thats assuming your not in OL during decel with the fuel tables commanding rich
    i did have some doubts that the maf periods are bit off, i'm using the MAF periods provided by PMAS but i always felt they're slightly off especially on idle.

    i have two MAF periods that i'm using for my PMAS intake. i'll post both once i reach home.

    BTW the MAF reading in Microseconds, i set it to 106 as per the cookbook is it ok to keep it on that value or shall i reverse it back to it's original value which is 1000 and i wish if someone can explain it to me further because i couldn't find any good or useful explanation.

  6. #6
    Tuner in Training
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    My previous MAF Period
    MAF PERIOD 2.JPG

    currently i'm using this MAF PERIOD
    MAF PERIOD 1.JPG