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CL55 AMG - Intermittent Reving

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by richardN2O, Nov 27, 2012.

  1. richardN2O

    richardN2O Senior Member

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    Location:
    Guildford, Surrey
    Your Mercedes:
    CL55 AMG Kompressor
    OK guys thinking caps on. The intermittent fault came back this afternoon. Turn key, engine rev's to 2000 and stays there, blip the throttle it revs to 3000 sometimes 4000 and stays there. Re-start, revs to 2000 again. On approx. the 10th re-start it went back to normal - phew and I was able to get home. The last time this happened nothing showed up on the STAR and just re-starting it restored it to normal.

    I'll continue using it until the intermittent becomes more regular or constant, then hopefully we'll find the cause.
     
  2. NW_Merc

    NW_Merc Banned

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    Oop Norf
    Your Mercedes:
    Mercedes W202
    Idle control valve?

    Incidentally has the fuel filter (or filters) been changed?
     
    Last edited: Nov 27, 2012
  3. OP
    richardN2O

    richardN2O Senior Member

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    Your Mercedes:
    CL55 AMG Kompressor
    Not to my knowledge, major service next spring.
    It runs superbly 99.9% of the time and NEVER misses a beat, apart from this very intermittent starting issue.
     
  4. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

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    Your Mercedes:
    C63 Wagon in black
    Surely it can only be receiving an incorrect signal from the tps, or a fault with the throttle actuator?
    Never come across this :confused:
     
  5. andy@pcd-ltd

    andy@pcd-ltd Guest

    One thing that springs to mind is there is a T-piece under throttle body and this might be starting to crack and taking in unmetered air
     
  6. OP
    richardN2O

    richardN2O Senior Member

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    Your Mercedes:
    CL55 AMG Kompressor
    Already replaced the entire throttle pedal as the accelerator sensor failed a couple of weeks back
     
  7. OP
    richardN2O

    richardN2O Senior Member

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    ty, but surely it would run bad all the time with something like that. It runs too well lol
     
  8. andy@pcd-ltd

    andy@pcd-ltd Guest

    It may only be a very small crack

    The other thing which i think i mentioned last time you had problems is these engines also suffer with throttle body issues as well
     
  9. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

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    Your Mercedes:
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    I think with the heat the 55k engines generate in the engine bay, if there was unmetered air via a crack in a plastic pipe it would expand/ break pretty quickly.
    I may be wrong though and it's a good shout!
    Also worth noting that the ecu should pick up this via adaptation values.
     

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