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Thread: Fuel trims are in check but the car is still super rich

  1. #1
    Advanced Tuner
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    Jun 2018
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    Fuel trims are in check but the car is still super rich

    So just like the title says. Tuning in a LSA 408. The fuel trims are spot on but the exhaust fumes burn your eyes. I'm going to hook a wide band up to it to confirm. It is in a TBSS with new o2 sensors. If I confirm its rich what can I change to get the fuel trims back on track

  2. #2
    Senior Tuner
    Join Date
    Mar 2011
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    Ripley, MS
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    Do you have any exhaust leaks or misfires? Do you have a full exhaust system?

  3. #3
    Tuner ttz06vette's Avatar
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    Sep 2008
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    Charlotte, NC.
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    You have verified you are in closed loop?

  4. #4
    Senior Tuner
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    Jan 2014
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    Australia
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    might need some eoit if the cam is letting some fuel out the exhaust valve, trims won't pick up on raw fuel as they only sense oxygen