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CLS 350 W218 2012 intermittent kick down

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Frank Patten, Dec 1, 2018.

  1. Frank Patten

    Frank Patten Senior Member

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    Location:
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    Your Mercedes:
    W212 E class 220cdi, R171 200 SLK
    Hi All, This is my son-in-law’s car. During normal cruising if the accelerator is suddenly pressed for overtaking the gearbox fails to change down and the car simply accelerates slowly. The kick down switch also fails to work although it has been changed twice. The fault occurs more when it has been recently used, if it is left for several days it works OK for a while. The garage (not a Mercedes dealer) appears to have no idea what is wrong. They have changed various parts costing around £1200 so far. We have lost track of what was changed. We don’t want to go to a main agent, so has anyone any idea of where to start or can someone recommend an independent in the Hemel Hempstead area please?
     
  2. John Laidlaw

    John Laidlaw Senior Member

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    Your Mercedes:
    W212 E63 ///AMG V8 Biturbo Volvo XC90 2018
  3. range rover

    range rover Senior Member

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    Your Mercedes:
    S class 320L CDI 4DR Auto CHALCEDONY BLUE 2005/straight 6
    Without fear of contradiction Sir, your problem lies with the hated EGR valve, if you look through the threads here you will find a very very well documented cure for this. I had the same problem, my indie replaced the EGR valve and that cured it more or less, I say that because it refused to kick down one since then, as I say there is a very well documented cure on one of the threads here, the difference there being that the member cleaned out the whole manifold, and to quote him 'she pulls like a train' now.
     
  4. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    I wouldn't suggest replacing any parts until we have at least the fault codes of what is being stored for this fault to happen.

    Could have an air leak, a throttle pedal fault or even just need a software update post whats already been replaced. This isn't a guessing game.
     
  5. range rover

    range rover Senior Member

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    Quite, on the law of averages no two are the exact same.
     
  6. OP
    Frank Patten

    Frank Patten Senior Member

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    Your Mercedes:
    W212 E class 220cdi, R171 200 SLK
    Thanks very much for your help guys, its good to have an idea of where we are going. I have told my daughter to get the fault codes and a list of replaced parts from the previous garage who have now given up on the car. When I get the info I will post it here.

    Thanks again,
    Frank.
     
    Wighty likes this.
  7. OP
    Frank Patten

    Frank Patten Senior Member

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    Joined:
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    Location:
    Worthing
    Your Mercedes:
    W212 E class 220cdi, R171 200 SLK
    OK, I have the details of what has been replace but we don’t have the fault codes:
    7 Feb 18 Exhaust Air Pressure Sensor
    22 Feb MA0149976445 O ring
    MN007603012100 Seal Ring
    VA0091535028 Sensor
    2 March EGR valves
    6 July (during a service) Air Mass Flow meter & Air filter.
    But the fault still persists. I have a feeling that this may not help much but any clues would be much appreciated.
    Thanks, Frank.
     
  8. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    Looks like they guessed at a boost leak, then a EGR fault before giving up? As you say, without codes, its difficult to say. Freeze frame data at the time of limp mode will give you some insight into the root cause.
     
  9. John Laidlaw

    John Laidlaw Senior Member

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    Sounds like they’ve been guessing then guessing again rather than getting back to diagnostic basics - costly
     
  10. OP
    Frank Patten

    Frank Patten Senior Member

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    Your Mercedes:
    W212 E class 220cdi, R171 200 SLK
    Thanks a lot guys, I appreciate your input. I will tell my daughter to take the old bills with her when she takes the car to Welwyn Merx. Hopefully they will fix it properly!

    Regards, Frank.
     
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