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    Junior Member BHC5's Avatar
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    Default Why does my SDOL car run richer in cooler weather?

    Just curious if it's a setting I'm missing or do I have a bad sensor or what? The issue is: A/F ratio goes rich when the outside temps are below 54 degrees F. But above that point at above 60 degrees F. the A/F ratio is good.

    When I say richer, it goes from cruising in the 13's to cruising in the 12's and light loads=11's, too fat. As soon as the outside temps warm up the A/F ratio goes back to normal. Notice on cool mornings then changes as the day warms up.

    (Note: Tuned for E10 fuel so 13.1 is the happy place for this ride at light cruise)

    I'm a part-time DIY tuner, still learning so please be nice



    Tune file attached
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