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Thread: MAF/IAT change

  1. #1
    Potential Tuner
    Join Date
    Dec 2024
    Posts
    2

    MAF/IAT change

    Good afternoon,

    I have a 2018 silverado 1500 with 5.3 . I did not realize at the time of tuning that the IAT was reading high and MAF was reading low. I just replaced the sensor and put a new filter in and now truck is running like crap with KR. I am trying to ask opinion on if decreasing maf calibration is all i need or if I need to completely start over. Any help in were to start would be great, new and truthfully cant afford to take it to a dyno around here with the prices after the transmission rebuild and cam going out.

    It's a 2018 chevy silverado 5.3
    Texas speed stage 1 low lift camshaft with factory fuel lobe 212/224 .582/.582 112lsa, 108icl version 2
    Behive valve springs pax 1275x
    Afm deleted
    K and n air intake
    Msd coils
    Gibson performance exhaust
    305/75/18
    Current temp 56 degree outside

    I also included the last log while iat and maf was off "log 7" temp at the time was around 35 degrees out
    Attached Files Attached Files
    Last edited by Armydoc2006; 04-13-2025 at 07:19 PM. Reason: Adding previous log

  2. #2
    Senior Tuner
    Join Date
    Nov 2006
    Location
    North Carolina
    Posts
    4,929
    The MAF table is where you should be. Try multiplying by 1/2 for your corrections. GEN 5 seem to overshoot for me anyway.
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