1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

ml270 poor fuel consumption

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by tony jr, Jan 7, 2013.

  1. tony jr

    tony jr Senior Member

    Messages:
    581
    Likes Received:
    9
    Joined:
    May 5, 2009
    Location:
    Nottingham
    Your Mercedes:
    GL320 X164 2007
    I have a 2003 ml270 with approx 155K on the clock. I usually find that I get around 28mpg in winter and around 32mpg in summer. For some reason I had a large decrease in mpg (down to 22.8mpg) last week and I'm not sure why!the 4 weeks before that had all been 28mpg. My thermostat is ok and the car drives very well apart from the poor fuel consumption. Any ideas?
     
  2. rjevon

    rjevon Senior Member

    Messages:
    320
    Likes Received:
    1
    Joined:
    Apr 1, 2009
    Location:
    Staffordshire
    Your Mercedes:
    ML 270 CDi 2002
    Can you post a pic of your thermostat at normal operating temp, as I think mine is too low.

    I struggle to get anything over 26 ish.

    All injectors replaced, over time, air flow meter and no faults showing. Also did the EGR shunt. Nothing has made a difference.

    Richard
     
  3. rpe2

    rpe2 Senior Member

    Messages:
    2,863
    Likes Received:
    2
    Joined:
    Sep 25, 2006
    Location:
    Silchester
    Your Mercedes:
    His: 2018 E220 d; Hers: 2016 SMAX
    The engine should run in the high 80's c
     
  4. OP
    tony jr

    tony jr Senior Member

    Messages:
    581
    Likes Received:
    9
    Joined:
    May 5, 2009
    Location:
    Nottingham
    Your Mercedes:
    GL320 X164 2007
    engine temp around 83 degrees centigrade
     
  5. OP
    tony jr

    tony jr Senior Member

    Messages:
    581
    Likes Received:
    9
    Joined:
    May 5, 2009
    Location:
    Nottingham
    Your Mercedes:
    GL320 X164 2007
    I keep a note of my mpg each time I fill up so I know what I would normally expect - I was surprised that it had suddenly dropped from to 22.8mpg - not a gradual drop off
     
  6. oigle

    oigle Senior Member

    Messages:
    3,043
    Likes Received:
    349
    Joined:
    Mar 15, 2005
    Location:
    Redcliffe, Queensland, Australia
    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    If it was only with one fill, it could easily have been the result of a short fill previously. I'd run a couple of tanks to make sure before worrying. Is it blowing plenty of black smoke under load? If so, you have an issue.
     
  7. rjevon

    rjevon Senior Member

    Messages:
    320
    Likes Received:
    1
    Joined:
    Apr 1, 2009
    Location:
    Staffordshire
    Your Mercedes:
    ML 270 CDi 2002
    Did you actually resolve this Tony_jr ??

    Richard
     
  8. OP
    tony jr

    tony jr Senior Member

    Messages:
    581
    Likes Received:
    9
    Joined:
    May 5, 2009
    Location:
    Nottingham
    Your Mercedes:
    GL320 X164 2007
    I did not do anything but the fuel consumption is back up to around 28 mpg
     

Share This Page