2nd Gen R56 Cooper Most liked posts in thread: Knocking once car is off

  1. Nathan

    Nathan Founder

    Mar 30, 2009
    25,144
    10,052
    113
    Writer
    Short North
    Ratings:
    +10,069 / 0 / -0
    #2 Nathan, Dec 2, 2015
    Midgets trying to escape?

    Heh, I can't think of anything.
     
  2. DneprDave

    DneprDave Well-Known Member
    Supporting Member

    Oct 23, 2010
    2,959
    1,505
    113
    Engineer
    Pacific NW
    Ratings:
    +1,731 / 0 / -0
    #3 DneprDave, Dec 2, 2015
    From the rear? Maybe an exhaust hanger is loose or broken.
     
  3. Friskie

    Friskie Well-Known Member

    Jul 20, 2009
    1,650
    1,333
    113
    Highly motivated retiree
    In the here and now, for now.
    Ratings:
    +1,339 / 0 / -0
    #4 Friskie, Dec 2, 2015
    If it kind of a ticking, pinging sound it's the hot metal in the exhaust system cooling down. Metal expands and contract w/temperature so, yea, the metal moves and it's most evident in cold weather.