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R320. CD1 tickover

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by MarkF, Jan 13, 2018.

  1. MarkF

    MarkF Senior Member

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    Joined:
    Dec 24, 2006
    Location:
    Rhyl, North Wales
    Your Mercedes:
    ML 270CDi
    This stunning car arrived last September. Now ever since I got it the tickover has always been around 800/900 rpm in or out of gear. Just of late it's got a mind of its own, sometimes it will drop to around 600/700rpm, still nice and smooth. Other times it will start at the 800rpm and then after a short drive, stop at a junction and it will suddenly drop to 600/700.
    Just wondering if I have. Sensor on its way out, could a man sensor cause this.

    Any ideas?
     
  2. John Laidlaw

    John Laidlaw Senior Member

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    Your Mercedes:
    W212 E63 ///AMG V8 Biturbo Volvo XC90 2018
  3. OP
    MarkF

    MarkF Senior Member

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    Joined:
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    Location:
    Rhyl, North Wales
    Your Mercedes:
    ML 270CDi
    No Dash lights and it drives just fine, no loss of power nothing just the revs drop.

    I assume that the normal tickover rpm for a 320CDi V6 engine is 800/900rpm.
     
  4. KennyN

    KennyN Senior Member

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    Your Mercedes:
    CLS G-E , ZX12r / ZRX11 / ZRX Monoshock
    On my V6 CLS diesel the car idles at 600 rpm , when just started it will sit at 800 until it is various monitoring sensors are happy, then drop to 600.

    The time it takes to drop to 600 varies , dependent on ambient temp , load on the electrics , how much charge is in the battery.

    I replaced the battery last year and the time for the initial revs to drop reduced considerably.

    Kenny
     
  5. OP
    MarkF

    MarkF Senior Member

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    Location:
    Rhyl, North Wales
    Your Mercedes:
    ML 270CDi
    Oh thanks for this, appears then that mine has been constantly high rpm from day one.
    Interesting what you said about the battery as the last few weeks I have had a glow plug issue, light stays on and in a cold morning not that it gets that cold here I have given it two to three pre heats before turning the key to start. I wonder if it's taking its toll on the battery? Need to get it to the indi soon as I get chance to sort glow plug issue, will ask him to check.

    Many thanks.
     

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