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Thread: Help MAF Sensor Fails when Tuning MAF

  1. #1
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    Help MAF Sensor Fails when Tuning MAF

    Hello, I am new to tuning and thought I was off to a good start. My main issue is that while I am tuning my MAF scale for some reason my MAF sensor state goes to fail. Here is a summary of my setup

    Gen IV L9H Swap w/L96 Injectors with 6l80e into my 2004 Jeep Wrangler. The reason i swapped injectors is because i updated the engine from an L92 to L9H for better transmission support.
    I have installed an AEM Wideband O2 sensor and reading lamba and it seems to be working just fine. I have gone into my Tune file and done the below. What is happening is I am driving and its logging data and then switches in MAF failed and then goes lean and runs rough. Once i switch back to my original tune file and then log it there is no issues with MAF sensor. Infact I have been driving it for weeks without any MAF issues. Please help!
    See my Log files and tunes attached

    MAF Tuning Step 2
    Engine - Airflow - General
    MAF Calibration - increase 15%

    MAF Tuning Step 1
    Engine - Fuel - DFCO Cutoff
    enable/disable RPM
    enable ECT/disable ECT

    Engine - Fuel - Temp Control
    COT - Disable

    Engine - Fuel - Oxygen Sensor
    Monitoring - O2 Readiness ECT, O2 REadiness Delay
    Long Term Fuel Trims - Min ECT/Max ECT

    Engine - Airflow - Dynamic
    High RPM Disable
    High RPM Re-enable

    Engine - Spark - Advance
    Base Table subtract 5

  2. #2
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    Bump for help please. I did a couple more runs in my stock tune and thr MAF works fine with no fail sensor status - thoughts on what I should or further disable in my tune?

  3. #3
    Senior Tuner edcmat-l1's Avatar
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    Put it back in closed loop and use the short-term trims to dial in the MAF.

    EFI specialist
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  4. #4
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    are you saying I should pull all of my changes in the Fue/O2 section of my tune?

  5. #5
    Senior Tuner edcmat-l1's Avatar
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    Yes that's what I'm saying. Put it back in closed loop. Leave your long-term trims off. Don't just randomly add to your MAF table, dial it in. For all you know the trims are going to pull that 15% you added back out.

    EFI specialist
    Advanced diagnostics, tuning, emissions
    HPtuners dealer and tech support
    email=[email protected]

  6. #6
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    Copy all. Can you help me understand what by the MAF goes to failed?