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W126 5.6 high idle?.

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by widebodysec, Dec 30, 2012.

  1. widebodysec

    widebodysec Active Member

    Messages:
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    Joined:
    May 17, 2008
    Location:
    Richmond North yorks.
    Your Mercedes:
    AMG SEC wide body 5.6
    Hi guys recently the car has started as normal then the idle once bit warmer stays about 800 850 rpm. It there a mechanical turn down or is this electrical?
    Cheers again.
     
  2. television

    television Always remembered RIP

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    Joined:
    Mar 14, 2005
    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    What year is the car please :D
     
  3. OP
    widebodysec

    widebodysec Active Member

    Messages:
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    Joined:
    May 17, 2008
    Location:
    Richmond North yorks.
    Your Mercedes:
    AMG SEC wide body 5.6
    1988

    Hi fella we met at bbq 3 years ago. Silver wide body amg!
    Car is 1988 5.6
     
  4. television

    television Always remembered RIP

    Messages:
    164,074
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    Joined:
    Mar 14, 2005
    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    OK I know who you are now. :D:D

    OK there is 2 parts to your system. the car when at idle runs from the idle ECU, if there is a fault on the throttle switch or idle ECU then it reverts to the main ECU and high fail safe idle, do check the change over switch on the throttle.

    Its easy to check if running on the idle or main computer ECU. if the speed goes up by 50 rpm when you engage D or turn the air con on, then working on the idle ECU if no change its running on the main computer ECU
     
  5. OP
    widebodysec

    widebodysec Active Member

    Messages:
    41
    Likes Received:
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    Joined:
    May 17, 2008
    Location:
    Richmond North yorks.
    Your Mercedes:
    AMG SEC wide body 5.6
    Ok will investigate when get time and let you know my findings, thank you.:)
     
  6. ianrandom

    ianrandom Senior Member

    Messages:
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    Joined:
    Aug 9, 2009
    Location:
    Berks & South Devon.
    Your Mercedes:
    1986 420SE, 1990 420SEC, 1989 2cv6.
    Worth cleaning your idle control valve by soaking it for a week in petrol or brake fluid. A simple and very cheap 'worth a go' thing.
    They get full of carbon.
     

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