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Thread: Fueling question

  1. #1

    Fueling question

    I cant figure out why at cruse i am running so rich? I am only at 20% on the tps but i am showing 12.6 on the wideband , why am I running so rich? this all happens under 3200 rpm over that I am in consistent boost so the air is catching up to fueling and runs sold and strong , could there be an issue with my tps and the 102mm tb?
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  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Why is your commanded AFR changing so much?

    At cruise it needs to be steady at stoich.

    Then remove fuel with your VE table to make the commanded match the actual using your wideband error.

    I still think you will struggle to get proper help when the tune is so screwy. It doesn't run with "normal" settings and if what that log shows is correct the injectors are nearly at 45-50ms with over 160% duty cycle. I don't know if the stock computer just can't handle for extremely low compression engine or if it's another problem but I'd be going to a standalone holley system that can handle pretty much anything.
    Last edited by 5FDP; 07-23-2018 at 10:22 AM.
    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.