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Help W203 C270CDI Manual Problem

Discussion in 'Engine' started by CSMITH8757, Apr 29, 2007.

  1. CSMITH8757

    CSMITH8757 New Member

    Messages:
    13
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    Mar 18, 2007
    Location:
    MID WALES
    Car:
    C270 CDI MANUAL
    Today I have started to have a strange noise from the car. If i accelerate not to hard the car seems to drive fine but as soon as I put my foot down I get a hissing sound and the car doesn't accelerate as quickly as it use to. I have also started to get a bit of smoke on startup from cold. Any ideas
     
  2. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Location:
    Horndean, Portsmouth, Hampshire, Southsea
    Car:
    C43 AMG with a 55 engine and supercharger, MK1 Caddy, S500, etc
    It sounds like you have either a split boost pipe, hole in the intercooler or a boost pipe has come off.
     
  3. OP
    OP
    CSMITH8757

    CSMITH8757 New Member

    Messages:
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    Mar 18, 2007
    Location:
    MID WALES
    Car:
    C270 CDI MANUAL
    The car now only goes to about 2500 revs if you try to boot it . If you turn of the ignition and start it again it is ok as long as you do not use much boost. But if you try to use boost i get the air noise and it limits to 2500 revs again.
     
  4. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    18,087
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    Location:
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    Car:
    C43 AMG with a 55 engine and supercharger, MK1 Caddy, S500, etc

    Start with what I have recomended first. This should help.....
     
  5. OP
    OP
    CSMITH8757

    CSMITH8757 New Member

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    Have got a few spare hours tomorrow so will have a good look at hoses. Fingers crossed
     
  6. OP
    OP
    CSMITH8757

    CSMITH8757 New Member

    Messages:
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    Mar 18, 2007
    Location:
    MID WALES
    Car:
    C270 CDI MANUAL
    All sorted. It was noticed that there was signs of air blowing past the seals on the first cat. These were replaced with new seals and spring clamps. The middle cat was also looked at and was found to be blocked. They managed to knockout the honeycombe of the cat and empty it. It was put back on the vehicle and it is like a different car drives great. I was going to get a new cat but I think I will leave it as it is.
     
  7. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    18,087
    Joined:
    Feb 8, 2007
    Location:
    Horndean, Portsmouth, Hampshire, Southsea
    Car:
    C43 AMG with a 55 engine and supercharger, MK1 Caddy, S500, etc
    Glad you got it sorted
     
  8. normanr

    normanr Hardcore MB Enthusiast

    Messages:
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    Aug 14, 2006
    Just curios now but is it legal without the cat and would it pass the mot.
     
  9. KLP 92

    KLP 92 Hardcore MB Enthusiast

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    Pre 2003 diesels don't require a cat for MOT.
     
  10. Dieselman

    Dieselman Banned

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    No diesel does as long as it can pass a smoke test, which it will as the Cat has very little bearing on smoke output.
     
  11. ckember

    ckember Hardcore MB Enthusiast

    Messages:
    814
    Joined:
    Feb 9, 2005
    Car:
    CLS 350 CDI Shooting Brake AMG Sport
    I had something similar when the front cat felt fell apart and blocked the second cat, this caused the exhaust gases to be pushed back past the front coupling. When I had this problem it started as a hiss but within 15 minutes the car started to fill with fumes as the air con was on. MB had to replace both the cats.
     

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