james ... 5/8/2011

1999 BMW 328is Base 6Cyl2.8L - Engine

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Engine miss fires, water is coming from the exhaust . engine check says fuel trim malfunction(bank 1)

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  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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