2012 C250CDI Odd Noise When parked.

Discussion in 'Engine' started by Colin_b, Apr 27, 2014.

  1. Colin_b

    Colin_b Hardcore MB Enthusiast

    Messages:
    1,780
    Joined:
    Jul 9, 2007
    Location:
    Leicester
    Car:
    C250CDI (C320CDI & SLK350, Sold) & the Trusty Citigo
    If I park my 2012 C250CDI, assuming the engine is warm, an odd noise starts after an hour and keeps occurring for at least 4 hours.

    The car is running perfectly otherwise, using no oil or coolant, just this odd noise, which is loud enough to draw attention to the car.

    Anyone any idea what it might be? I assume it is related to the engine cooling, and appears to be coming from around the ABs unit.

    The noise can be heard in the youtube link below....

    https://www.youtube.com/watch?v=hBXRet0mwFE&feature=youtu.be
     
  2. OP
    OP
    Colin_b

    Colin_b Hardcore MB Enthusiast

    Messages:
    1,780
    Joined:
    Jul 9, 2007
    Location:
    Leicester
    Car:
    C250CDI (C320CDI & SLK350, Sold) & the Trusty Citigo
    I took the car to the dealer today. Initially met with some scepticism, but the car co-operated and nade the noise!

    It appears to be the fuel pump randomly turning on, and the noise is the pressure relief valve.

    They tested the pump, and it is fine. However there was a software update which they have applied, and that appears to have stopped the noise.

    If it reappears, then a new pump.
     
    3 people like this.

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