2nd Gen R56 Cooper S Most liked posts in thread: Gen 2, Engine Misfire

  1. countryboyshane

    countryboyshane New Member

    Jul 23, 2009
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    #2 countryboyshane, Sep 29, 2011
    Did they already check for excessive carbon buildup in the intake ports and combustion chamber? There are many documented cases of excessive buildup in the intake ports (especially around the valve seats) causing misfire problems. I would check there. 50-60K miles is where most manual transmission R56 S's are seeing their first issues with carbon problems. The automatic's start at around 30K:blush2:
     
  2. AnneKara

    AnneKara New Member

    Oct 3, 2009
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    #3 AnneKara, Sep 29, 2011
    Gen 2 Engine Misfire

    My service writer suggested that i try a can of BG44K! Well, I did and surprisingly it greatly improve the driveablity of my Mini!! My Mini was much improved within five minutes of driving, and my mileage has improved. The other thing that I noticed was that the idle has smoothed out. I am thinking that the injector cleaning the dealer did only partial cleaned up the gunk and the BG44K finished the job. The other thing the dealer suggested was to go to mid-grade fuel, as at our altitude 6000+ft premium wasn't needed in the Fall-Winter-Early Spring? Anyway, my Cooper S is fun to drive again.
     
  3. Nathan

    Nathan Founder

    Mar 30, 2009
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    #4 Nathan, Sep 29, 2011
    Keep notes of all this. Make sure you have the work orders from the dealer to document this issue as it will happen again and again. Since you are past the 50k point you will need all the ammo you can get in case this turns into something more.
     
  4. countryboyshane

    countryboyshane New Member

    Jul 23, 2009
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    Diesel Engineering
    Bloomfield Hills, MI
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    #5 countryboyshane, Sep 29, 2011
    Fuel system cleaners will do a good job of cleaning any buildup in the fuel system especially in injector nozzles and it cleans up the combustion chamber a little bit.

    I still think you have a lingering problem with carbon build-up. The fuel system cleaner doesn't clean the intake ports in a direct injection engine like the N14 engine features. The dealer is probably dodging this because it takes a lot longer time to manually clean out the ports compared to adding fuel system cleaner. MINI USA might not pay them for the work either if they can get by with the easiest solution. They might not have the new BMW special tool for it either:(

    Either way, keep motoring with a smile on your face!