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Loud ticking / tapping noise once engine is turned off

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Micky P, Jan 10, 2021.

  1. Micky P

    Micky P New Member

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    Your Mercedes:
    C class 2012 1.6
    Hoping someone can help with the following issue I’ve noticed with a used automatic C Class coupe 2012 I’ve recently purchased. The car makes a loud ticking / tapping noise once it’s parked after having been driven and the engine is turned off. It goes on for 10+ minutes - I haven’t waited to time exactly how long it goes on for before it stops, I only know it lasts for a minimum of 10 minutes as was stood by it waiting for my daughter to come out of nursery the other day! Seems to happen regardless of how long I’ve been driving (nursery is only 8 minutes from the house!). Noise seems to come from the rear. Will obviously be taking it to a garage, but just wondered if anyone else has had a similar issue and what you were told it could be/was?
     
    Jim2 likes this.
  2. mattkh

    mattkh Senior Member

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    Your Mercedes:
    W168 1999 1.6
    A pump trying to lock your car. Which side do you notice it, drivers or opposite ??
     
  3. onefortheroad

    onefortheroad Senior Member

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    Your Mercedes:
    c207 e350 cdi 2017 . ford kuga 65 plate awd powershift .
    Check the boot for illegals ?

    Is it not just the exhaust pinking ...
     
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  4. OP
    Micky P

    Micky P New Member

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    Your Mercedes:
    C class 2012 1.6
    Sounds like it’s at the rear passenger side by the exhaust
     
  5. OP
    Micky P

    Micky P New Member

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    Your Mercedes:
    C class 2012 1.6
    Wondered where the missis had been...
    What is pinking??
     
  6. john campbell

    john campbell Senior Member

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    Your Mercedes:
    2012 E250 sport deisel
    It will be the exhaust cooling down in the cold weather.......... get it checked but I very much doubt they will find anything wrong with the car.
     
    sl500amgsport and Micky P like this.
  7. OP
    Micky P

    Micky P New Member

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    Thanks. It just seems strange that it makes such a loud noise for such a long period after minimal amount of driving?
     
  8. mattkh

    mattkh Senior Member

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    Your Mercedes:
    W168 1999 1.6
    Next time you are back after a drive, quickly get out, open the trunk and check if the noise gets louder on the passenger side. If it is there, then its not the locking pump. If the noise is not there, then close the trunk and lock the car. If the noise starts, then it is the central locking pump.
     
    Micky P likes this.
  9. ajlsl600

    ajlsl600 Senior Member

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    france
    Your Mercedes:
    clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
    Fuel pump often mounted rear d/s ??
     
    Micky P likes this.
  10. DREAMER NO2

    DREAMER NO2 Senior Member

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  11. onefortheroad

    onefortheroad Senior Member

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    Your Mercedes:
    c207 e350 cdi 2017 . ford kuga 65 plate awd powershift .
    Pinking is a ticking sound . When a hot exhaust begins to cool down. If it was the central locking pump , you could replicate that sound without driving or even starting the car.
     
    Micky P likes this.
  12. OP
    Micky P

    Micky P New Member

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    C class 2012 1.6
    Update - garage have said it’s the “baffles” coming from inside the exhaust system. Apparently the part needs to come from Germany is around £700!!
     
  13. onefortheroad

    onefortheroad Senior Member

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    Your Mercedes:
    c207 e350 cdi 2017 . ford kuga 65 plate awd powershift .

    It will be if its from mercedes . Pretty sure the likes of kwik fit will supply for alot less.
     
  14. Bay Leaf

    Bay Leaf Senior Member

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    SL 350 2013
    I think you might mean pinging. Pinking is another term for pre ignition especially with a petrol engine.
     
  15. onefortheroad

    onefortheroad Senior Member

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    No I mean pinking. To me a ping is the sound a submarine makes looking for u boats. OK .
     
  16. sonic

    sonic Senior Member

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    Your Mercedes:
    E350CDI, SLC250d, FJR 1300
    I have had it on occasions on my 212 E350CDI, normally after a long run. I just assumed it was something like the exhaust cooling down, its been there for nearly 9 years. I have just lived with it.
     
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  17. mattkh

    mattkh Senior Member

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    Your Mercedes:
    W168 1999 1.6
    Would car breakers be an option as well ??
     
  18. OP
    Micky P

    Micky P New Member

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    C class 2012 1.6
    i think I might join you, don’t fancy spending around £900. Garage did say it isn’t anything serious, just annoying for the noise that it makes
     
    sonic likes this.
  19. john campbell

    john campbell Senior Member

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    Your Mercedes:
    2012 E250 sport deisel
    I would just live with it because once the weather picks up you probably won't heard it.
     
  20. CowleyStJames

    CowleyStJames Senior Member

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    Location:
    Oxford
    Your Mercedes:
    Mercedes-Benz C-Class Estate C200 CDI BlueEFF. Executive SE 5dr
    The only time I've heard mine ticking the way you describe, is when the DPF is going thru a regen and I've parked up and turned engine off.
    The regen causes a huge rise in exhaust temperature and the ticking is it cooling down
     

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