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W163 ML270cdi wont rev above 3000rpm!

Discussion in 'Engine' started by Doosh1, Mar 3, 2010.

  1. Doosh1

    Doosh1 Member

    Messages:
    38
    Joined:
    Jan 10, 2010
    Location:
    Northants
    Car:
    X5 - ML270
    I have been having a intermittent fault on my 2002 ML270 which has now become permenant. Basically the car will not rev above 3000rpm and feels to have no boost. It also wont kickdown.

    The only fault I can find is the MAF sensor. This appears to be running at a default value and show no fluctuation throughout the rev range or variations in load.

    Has anyone had a faulty MAF sensor before and if so would these symptoms sound familiar?.

    Many thanks in advance for any help..
     
  2. Classy6

    Classy6 New Member

    Messages:
    22
    Joined:
    Sep 6, 2006
    Car:
    Vw Mk2 20vT
    Sounds like a MAF sensor to me mate, is the fault frequency high?
     
  3. OP
    OP
    Doosh1

    Doosh1 Member

    Messages:
    38
    Joined:
    Jan 10, 2010
    Location:
    Northants
    Car:
    X5 - ML270
    Yes it coming back with a signal voltage to high. Fault codes P0100 B2/5 MAF SENSOR.

    Just thought I may be looking for more than one problem..

    Thanks.
     
  4. renault12ts

    renault12ts Hardcore MB Enthusiast

    Messages:
    13,933
    Joined:
    Mar 5, 2009
    Car:
    2005 W215 CL500.
    I'm sure if you really want to find another fault you will do, but why look, go with the obvious.;)
     
  5. panason1c

    panason1c Hardcore MB Enthusiast

    Messages:
    1,141
    Joined:
    Feb 20, 2005
    Location:
    Somerset
    Car:
    ML270cdi, VW Polo 1.9 tdi, BMW K1200rs
    Sounds like a maf fault to me too.

    Only cost approx £60 from MB.
     
  6. OP
    OP
    Doosh1

    Doosh1 Member

    Messages:
    38
    Joined:
    Jan 10, 2010
    Location:
    Northants
    Car:
    X5 - ML270
    Got a new Pierberg MAF sensor today. Fitted and back running like new.. Should keep the misses happy for the school run!

    Thanks for help!
     
  7. MERC'ED!

    MERC'ED! Hardcore MB Enthusiast

    Messages:
    110
    Joined:
    May 31, 2010
    Location:
    South London
    Car:
    OLD c32 rep, c220 cdi. NEW e63 rep e320 cdi
    I have a C220 cdi, with a Similar problem!

    BUT I wish it was the MAF Sensor (As it would be a Simple Fix)

    Using my OBD2 Scanner, I Used the Live data feature, & can see the MAF readings are fluctuating, approx 8g idle & around 40g driving around!

    I have tryed looking for leaking air pipes, Next on my list are the Vacum pipes, But cant tell them from working or not???

    my car drives fine until warmish them goes into safety mode, making me unable to drive above 3000rpm!
     
  8. OP
    OP
    Doosh1

    Doosh1 Member

    Messages:
    38
    Joined:
    Jan 10, 2010
    Location:
    Northants
    Car:
    X5 - ML270
    Have you had the catalyst checked out? I know the Mercs are prone to the catalyst braking up and causing the car to slip into the safety mode which wont allow the engine to rev above 3000rpm..

    Good luck!
     
  9. ping_

    ping_ Banned

    Messages:
    3
    Joined:
    Jun 7, 2010
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