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E240 Estate hard to start.

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Alf G, Dec 1, 2012.

  1. Alf G

    Alf G Member

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    Joined:
    Dec 1, 2012
    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    I am hoping that someone can shed some light on this problem for me please. Does this model have 2 Air temperature Sensors (Knock Sensors?) fitted to it. If so, does anyone know where they are located please. I have had fault codes P2006 B17/8 & P2004 B2/5 show up on the diagnostics. I have renewed the Air mass meter, admittedly with one from Eurocarparts. Would the ECU's read this part differently than a Mercedes one? Many thanks for any help forthcoming
     
  2. rpe2

    rpe2 Senior Member

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    Location:
    Silchester
    Your Mercedes:
    His: 2018 E220 d; Hers: 2016 SMAX
    More detail please, is it hard to start when cold, hot or both?
     
  3. OP
    Alf G

    Alf G Member

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    Joined:
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    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    Hi Richard, It is both really, although worse when hot, which suggests the CPS I believe. But when I spoke to Mercs about it the guy kept coming back to the Knock Sensors, which I dont seem to be able to locate on my car. The P2006 code refers to the Right Charge Air Temperature Sensor? Having taken off the air intake tube from the inlet manifold I cannot see any other sensors in this line.
     
  4. rpe2

    rpe2 Senior Member

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    Location:
    Silchester
    Your Mercedes:
    His: 2018 E220 d; Hers: 2016 SMAX
    Likewise, I'd go with the CPS.

    The CPS doesn't always leave a fault code.

    You can test them by dropping into a cup of hot water and seeing if the resistance changes - but as its a bit of a fiddle to get it out, you may as well replace it if you have gone to the trouble.
     
  5. OP
    Alf G

    Alf G Member

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    Joined:
    Dec 1, 2012
    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    Thanks Richard,
    I will replace the CPS and see if that does the trick.

    Alf
     
  6. OP
    Alf G

    Alf G Member

    Messages:
    13
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    Joined:
    Dec 1, 2012
    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    I am still not convinced that the CPS is the fault here. I have access to a Snap-On Verlis diagnostic machine and it keeps coming back to a Knock sensor fault. The question is where are these sensors located?? The diagram shows them as being on the top part either side of the air intake casing, but on my motor they are not there. Can anyone help on this please.
     

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