1st Gen R53 Cooper S Most liked posts in thread: No idle, misfire

  1. Nathan

    Nathan Founder

    Mar 30, 2009
    25,144
    10,052
    113
    Writer
    Short North
    Ratings:
    +10,069 / 0 / -0
    #2 Nathan, Feb 12, 2013
    This might sound odd but check the relays under the hood to make sure they are plugged in all the way. Large bumps can and have in the past popped them out a little to the point where there were odd issues when running and even the car not running at all.
     
  2. limitedxj

    limitedxj New Member

    May 19, 2011
    8
    0
    0
    Ratings:
    +0 / 0 / -0
    #3 limitedxj, Feb 12, 2013
    upon further inspection today, the metal piece in the belt tensioner has broken off and the pully now rest against the balancer, don't know if this is the problem or a effect of the misfire which is violent. anyone with a similar story let me know.
     
  3. limitedxj

    limitedxj New Member

    May 19, 2011
    8
    0
    0
    Ratings:
    +0 / 0 / -0
    #4 limitedxj, Feb 12, 2013
    removed the belt and tensioner, the tensioner is now in 2 pieces. tried to start the car with no belt just to see if it would idle, no luck, acts the same.
     
  4. limitedxj

    limitedxj New Member

    May 19, 2011
    8
    0
    0
    Ratings:
    +0 / 0 / -0
    #5 limitedxj, Feb 14, 2013
    No compression in #4, all other cylinders at 125. Here's hoping its just a spring and not a bent valve or cam issue.
     
  5. yellowbritishrocket

    yellowbritishrocket Well-Known Member

    May 16, 2009
    618
    277
    63
    Ratings:
    +277 / 0 / -0
    #6 yellowbritishrocket, Feb 24, 2013
    sounds like when the tensioner smacked the balancer it probably locked up the engine long enough to foul up the valvetrain...i would get that valve cover off quick and check you could very have bent something or dropped a valve...

    i take it you were using an alta balancer? the problem with those lightweight crank pullies is yes they are lighter...but in regards to the fact you have a tensioner under alot of stress and tension above it...to me its almost like its a guillotine that is spring loaded...one good whack and it comes down hard on that balancer