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E220 EGR/Limp mode problem, help needed

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by ds99, Nov 21, 2012.

  1. ds99

    ds99 Member

    Likes Received:
    Feb 4, 2012
    Your Mercedes:
    E220 cdi
    I have a E220 Cdi (year 2000 model), I was getting loads of black smoke out of the exhaust on hard accelleration.

    I looked inside the EGR valve and it was completely full of black tar-like deposits, as I couldn't get the EGR valve off I cleaned it out using a toothbrush and spraying WD40 into it.

    This cured the smoke problem, but now the car intermittently goes into "limp" mode, ie lack of power, no kickdown and revs limited to 3000.

    The limp mode comes and goes, but when I unplug the MAF sensor, limp mode is definitely on. I can floor the throttle when parked and the revs do not go above 3000. When I plug the MAF sensor back in everthing is normal.

    Can anyone help???

    Is this a faulty MAF sensor? The problem only arose after I cleaned out the EGR valve.
  2. jj1975

    jj1975 Senior Member

    Likes Received:
    Sep 18, 2009
    Your Mercedes:
    w203 c220cdi 2002
    If limp mode come and go in my opinion it look MAF sensor is in way out thats what it happens with my till is complit faulty and stay in limp mode all the time best think is get diagnostic star fist to make sure what is via fault code

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