'98 202 C250 TD - No turbo.

Discussion in 'Engine' started by neilrr, Oct 30, 2014.

  1. neilrr

    neilrr MB Club Veteran

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    The turbo on my '98 C250 TD isn't working.

    No obvious leaks or funny noises, no lights on the dashboard. The car doesn't have a MAF, it does have a MAP.

    Took off the undertray & examined the two soft connecting pipes on the intake system, they seem fine.

    Next place to try is the EGR valve.

    2 questions:

    1) Will I need a new gasket?

    2) Can I use isopropyl alcohol to clean the EGR valve?

    Actually 3 questions.

    If it isn't the EGR, what's the next thing in line to try?

    TIA.
     
  2. nb_racing

    nb_racing Hardcore MB Enthusiast

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    Wastegate stuck open?
     
  3. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Get it plugged in firstly. This will save the guessing.
     
  4. Dieselman

    Dieselman Banned

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    A 250TD doesn't have a MAF so can't monitor the EGR valve.

    Dropping the turbo will be either the transducer diaphragm is split or the MAP sensor is U/S.
     
  5. OP
    OP
    neilrr

    neilrr MB Club Veteran

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    DM,

    Where is the transducer diaphragm?

    Ollie,

    It's been on Star but it didn't really shed any light on the cause.
     
    Last edited: Oct 30, 2014
  6. Bellow

    Bellow Hardcore MB Enthusiast

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    On my smart, I lost boost due to the wastegate sticking open.
    Usually the cause of that on a smart though is the operating arm coming detached due to the retaining C-clip corroding and falling off. Neither of these faults show on STAR.
     
  7. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    It does. You just have to know where to look.
     
    1 person likes this.
  8. Dieselman

    Dieselman Banned

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    The diaphragm is inside the vacuum transducer that feeds vacuum to the turbo actuator.
     
  9. OP
    OP
    neilrr

    neilrr MB Club Veteran

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    Right.

    Thanks.

    Where's the vacuum transducer? Is it in this picture?

    Ta!

    [​IMG]
     
  10. guydewdney

    guydewdney Hardcore MB Enthusiast

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    Top right. Small matchbox sized item, on firewall between engine and ecus. Pipe runs to front side of plastic manifold.
     
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