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    DQ2000CIVIC's Avatar
    DQ2000CIVIC Posts: 18, Reputation: 2
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    #1

    Aug 17, 2011, 06:31 PM
    Honda Civic Poor Gas Mileage (Running Rich)?
    TXGREASEMONKEY

    Car seems to run pretty good. At cold start it dies at stoplight about 2 miles from house. Auto Trans Ran Scan Tool and I was told its running rich and I guess that is part of my MPG prob and possibly the idle. Can you tell me what all to do or look for. Scan Tool numbers below


    Calc Load (%) 38
    STFT -17
    LTFT flucauted
    MAP 10.9
    twinkiedooter's Avatar
    twinkiedooter Posts: 12,172, Reputation: 1054
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    #2

    Aug 17, 2011, 06:35 PM
    Have you changed the fuel filter lately? That could make your car stall out when cold. All the gunk they are adding to the fuel nowadays causes mucho rust in the filter to accumulate.

    No, I am not Texasgreasemonkey but I am a car owner who has a bazillion years of expensive car repairs under her belt.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #3

    Aug 18, 2011, 05:51 AM
    Go over the entire ignition system. Poor gas mileage, performance, and rich condition are related to incomplete combustion. I suspect the Ignition Control Module (ICM) and coil should be replaced. Ensure the spark plugs (NGK only) have been replaced in the last three years. Clean throttle plate and throttle body with throttle body cleaner, clean air box, and replace air filter. Adjust idle speed to 700 rpm.
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