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Thread: Early 04 AFR state fuel correction

  1. #1
    Tuner in Training
    Join Date
    Jan 2022
    Posts
    10

    Early 04 AFR state fuel correction

    I keep running into AFR State as my master fuel correction reason. Always hitting it when trying to go from a stop, makes me look like im 98 years old going on a sunday drive. Looked everywhere through the tune and can't find what this is. Searched the forums and got nothing but a dead attachment. Does anyone know what this is? If its a table or a governor?
    Screenshot 2024-04-12 204216.png
    59CumminsBaseTune.hpt
    59CumminsBaseMod129.hpt

  2. #2
    i sent you two files over, you main pulse map has no fuel and likely the root cause of the issue. your main and pilot timing need work and i'd have rail coming in sooner.
    good luck sir
    2010 F-350 03 5.9/848ecm, built 5R110, 30% over sticks, 10mm pump, 64mm Stealth Turbo
    2008 F-350 03 5.9
    Fumminstuning.com

  3. #3
    Tuner in Training
    Join Date
    Jan 2022
    Posts
    10
    Thank you for the tune files. I agree that the lack of power was from too low of pulse, its been tricky trying to get the smoke down but still retain power, took a good amount of studying the log and watching what parts of the pulse table I'm actually using. It's much better now with power after increasing pulse in the right areas. I also raised rail pressure earlier and added more timing. Still smoky though.

    Should have mentioned I have 60% over injectors.

    Haven't touched pilot timing yet.

    I still don't know the root cause of the AFR state correction. I run into it occasionally at low RPM but also at WOT at 2800RPM and up. So still looking for help.

    New tune and log attached.
    Screenshot 2024-04-21 163253.png
    59CumminsBaseMod134.hpt
    59CumminsMod134.hpl

  4. #4
    Pilot timing won’t do anything for smoke