SLK230k down on power

Discussion in 'Engine' started by wilbur, Oct 21, 2008.

  1. wilbur

    wilbur New Member

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    Joined:
    Sep 25, 2008
    Location:
    Edinburgh
    Car:
    SLK 230K
    Hi all, I have recently bought a 1998 SLK230 auto, and it seems to be down in power. It is slow to pull away and has developed a shudder when driving. I'm not sure the kompressor is kicking in either, it takes a while to gt up to speed and doesnt really go fast at all. I can hear some kind of sucking noise when accelerating but not sure exactly where its coming from. No warning lights are on. All help will be appreciated! :confused:
     
  2. wemorgan

    wemorgan MB Club Veteran

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    A205 C220d
    supercharger owners will know plenty more than me, but here's my guess:

    air leak in the inlet system
    MAF sensor (I presume these engines have one)
    spark plugs & HT leads

    failing some simple checks yourself I'd advise a visit to your local independent who has a STAR machine. All the best.
     
  3. vijilants

    vijilants Hardcore MB Enthusiast

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    When you have the bonnet raised, and rev the engine you should hear the supercharger click as it kicks in.

    MAF can also cause loss of power.
     
  4. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Air mass sensor would be my first port of call.
     
  5. flango

    flango MB Club Veteran

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    similar to my clk 230 problem and car is similar year mine was down to air leak in the inlet system as posted earlier, local Indie fixed it incredibily cheaply, get the fault codes read that should point you in the right direction
     
  6. Dryce

    Dryce MB Club Veteran

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    Our SLK230 had a contaminated MAF.

    The engine check light didn't come on initially - on one long journey we had a slight shudder every so often when cruising at speed which I initially thought was a misfire and the car felt a bit down on power. The light came on a couple of weeks later.
     
  7. OP
    OP
    wilbur

    wilbur New Member

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    Joined:
    Sep 25, 2008
    Location:
    Edinburgh
    Car:
    SLK 230K
    Thanks for the input, I replaced the air filter and spark plugs today, also put a fuel additive through it. Initially the car seemed a lot better, then while driving tonight the problem happened again! It dooe seem like a misfire, but if i switch the engine off and back on the problem goes away for a while! Silly question, but can anyone point me in the direction of the MAF? Thanks again!
     
  8. OP
    OP
    wilbur

    wilbur New Member

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    Location:
    Edinburgh
    Car:
    SLK 230K
    Just remembered my dad has the same car as me so I will pinch his MAF to try on my car and see if that sorts it! :bannana:
     
  9. wemorgan

    wemorgan MB Club Veteran

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    It's attached to the plastic air inlet pipe just after the air filter.
     
  10. sweeper

    sweeper Hardcore MB Enthusiast

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    In fact it is attached to the pipe coming out of the intercooler, on the left hand side of the engine (right hand if viewed from the front) this comes up and is attached to the inlet manifold (throttle body) with a large cast elbow.
     
  11. OP
    OP
    wilbur

    wilbur New Member

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    SLK 230K
    Nice one, I'm gonna steal the one from my dads car at the weekend and see how that goes! :D
     
  12. vijilants

    vijilants Hardcore MB Enthusiast

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    Beware of simply swapping the MAF without resetting the ECU or you may find that the problem appears to be still present.

    I'd say get the codes read from the ECU first and see if it shows up anything. Also try disconnecting the lead from the MAF and see if there is any difference.
     
  13. OP
    OP
    wilbur

    wilbur New Member

    Messages:
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    Sep 25, 2008
    Location:
    Edinburgh
    Car:
    SLK 230K
    Many thanks for all the help guys, I replaced the MAF sensor at the weekend and the car runs and drives much better now, much smoother through gear changes and whats more I have plenty power again! So thanks all for pointing me in the right direction! :bannana:
     
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