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james k taylor
james ... 5/8/2011
1999 BMW 328is Base 6Cyl2.8L - Engine
Engine miss fires, water is coming from the exhaust . engine check says fuel trim malfunction(bank 1)
1 Answer
  • Spoon Sports
    Spoon Sports 5/9/2011
    It's that time of year when we see a lot of water vapor out the tailpipe. It takes longer to disappear in the winter as it takes a while to heat up the whole exhaust system. It's not something to worry about, as long as it's white and eventually disappears, as you have been observing.

    P0170 - Fuel Trim Malfunction (Bank 1)

    Possible Symptoms:

    Check engine light on
    Engine stall
    Poor gas mileage
    Black exhaust smoke
    Engine hesitation or misfire

    Possible Causes:

    Dirty or defective MAF sensor
    Vacuum leak
    Defective fuel pressure regulator
    Defective O2 sensor
    Oil contamination in the cam/crank sensor wiring or MAF/O2 sensor connector

    Possible solutions:

    Clean or replace MAF sensor
    Replace fuel regulator
    Replace damaged or cracked vacuum hoses
    Clean cam/crank sensor wiring or MAF/O2 sensor connector
    Replace O2 sensor

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