190 lumpy idle

Discussion in 'Engine' started by 94mattda, Apr 10, 2014.

  1. 94mattda

    94mattda Hardcore MB Enthusiast

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    Hello, I have a 1.8 auto 190 93 plate. It's done 104k but has a slight lumpiness on idle and slightly low with fluctuation on start up. Can anyone suggest where to start please, I thought plugs, leads, distributor etc
     
  2. Dieselman

    Dieselman Banned

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    I would check the distributor cap and rotor arm, then suspect an air leak into the induction system.
     
  3. OP
    OP
    94mattda

    94mattda Hardcore MB Enthusiast

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    Thank you, will have a look tomorrow for air leaks and get new distributor cap and rotor arm :)
     
  4. Mondorich

    Mondorich Active Member

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    How did you get on?

    When I bought my 190 last year I had a lumpy and hunting idle which was fixed by having the injection system "serviced". This involved the use of a long hex key by my mechanic - only the second time he's used it apparently because he hadn't had a mechanical injection car in for years.

    Needless to say, this fixed the issues and it has run smoothly ever since.

    :thumb:
     
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  5. horatio

    horatio Hardcore MB Enthusiast

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    Also could be the idle valve. A good soak overnight in meths can unclog it.

    Don't forget to check the vacuum pipe that runs under the plenum etc, it can deteriorate without you noticing.
     
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  6. SL300-24

    SL300-24 Hardcore MB Enthusiast

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    Is it an fuel injection car or carb?
     
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  7. Will

    Will MB Club Veteran

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    A 1993 1.8 car will be injection.

    Could be so many things - hard to tell without looking. I'd check the basics - distributor cap and rotor, leads etc.

    1.8 M102s like a head gasket too..

    Does the idle speed change when it's warmed up - thinking OVP relay etc?
     
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  8. SL300-24

    SL300-24 Hardcore MB Enthusiast

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    Cheers Will....I missed the 1993! Thanks for the under tray BTW.
     
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  9. OP
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    94mattda

    94mattda Hardcore MB Enthusiast

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    Can't see any air leeks. May change the bits mentioned above and see if the helps. Thanks for the replies so far
     
  10. OP
    OP
    94mattda

    94mattda Hardcore MB Enthusiast

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    Changed my distributor cap and rotor arm and the car is running a little better on start up. On initial start up in the morning or after a long period of standing for the day it tends to start up but idles rough and stalls, with a gentle repeated coaxing of the accelerator it runs ok, i am thinking the automatic choke?? any ideas or pointers.
     
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