2nd Gen R56 Cooper S Most liked posts in thread: Sputtering at 4500rpm

  1. itsmewutup

    itsmewutup New Member

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    #2 itsmewutup, Sep 11, 2013
    Anyone?
     
  2. Nathan

    Nathan Founder

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    #3 Nathan, Sep 11, 2013
    How many miles on the car?
     
  3. itsmewutup

    itsmewutup New Member

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    #4 itsmewutup, Sep 11, 2013
    90k. Has a used motor in it that's been running fine up until the other day. Mileage on the motor is within a few thousand of miles on the car.
     
  4. MCS02

    MCS02 Moderator
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    #5 MCS02, Sep 12, 2013
    What does it do when you go through this range under WOT? is it smooth or does it still sputter.
     
  5. Nathan

    Nathan Founder

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    #6 Nathan, Sep 12, 2013
    Take a look at the spark plugs. When were they last changed?
     
  6. Dave.0

    Dave.0 Helix & RMW Powered
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    #7 Dave.0, Sep 12, 2013
    Could be any number of things.

    Bad Gas
    Air Filter (rare)
    Needs new plugs or coil
    O2 sensor on its way out
    Crank Pull getting ready to go
    Dirty MAP or T-Map sensor

    I would start by replacing the plugs if the are the originals and a fresh clean tank or 93 octane gas and do a few runs WOT.
     
  7. itsmewutup

    itsmewutup New Member

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    #8 itsmewutup, Sep 12, 2013
    Haven't tried wot. Plugs were changed in April when the motor was put in. I never run anything but 93 in it. Had O2 sensor codes since I put a catless downpipe in (still a possibility?)
     
  8. itsmewutup

    itsmewutup New Member

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    #9 itsmewutup, Sep 13, 2013
    Update: As I'm on my way home from work this morning, it decided it was going to start misfiring all together. Pulling a cylinder 2 misfire. Currently at a gas station about 15 miles from my house and gonna check it out. Having a feeling it may just be a bad plug with the way its doing it. Will update later.
     
  9. itsmewutup

    itsmewutup New Member

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    #10 itsmewutup, Sep 13, 2013
    Well I feel like a complete idiot. Popped the hood open. Was messing around with the air box and noticed the coil wire had come unclipped. Guess the plug won't get any spark that way ;)

    On another note. It ran great the whole rest of the way home. High rpms and all!
     
  10. Nathan

    Nathan Founder

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    #11 Nathan, Sep 13, 2013
    Another problem solved!

    Glad it was something that was rather simple and low cost to "fix".
     
  11. MCS02

    MCS02 Moderator
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    #12 MCS02, Sep 13, 2013
    Glad to hear its fixed.