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Here are the technicians notes from BMW NW. I took the X6 to the independent service company after declining BMW's insistence they replace all with brand new spark plugs before they would do anymore troubleshooting. My Ind. service tech replaced the plugs in cyl. 1 and 2 even though neither plug showed any typical signs of misfires. Issue is still not resolved.
TEST DROVE VEHICLE AND FELT THAT THE ENGINE WOULD MISFIRE
SLIGHTLY UNDER ACCELERATION. PERFORMED SHORT TEST WITH NO FAULTS
RELATING TO CONCERN STORED. TEST DROVE VEHICLE WHILE OBSERVING THE
SMOOTH RUNNING AND MISFIRE VALUES. FOUND THAT CYLINDER 1 WOULD MISFIRE
HEAVILY WITH OCCASIONAL MISFIRES FROM OTHER CYLINDERS. SWAPPED IGNITION
COILS BETWEEN CYLINDERS 1 AND 2, THEN RE-TESTED. FOUND THAT THE MOST
MISFIRES REMAINED ON CYLINDER 1. SWAPPED SPARK PLUGS BETWEEN CYLINDERS
1 AND 2, THEN RE-TESTED. FOUND THAT CYLINDER 2 BEGAN TO MISFIRE
HEAVILY, INDICATING THE SPARK PLUG IS FAULTY. RECOMMEND REPLACEMENT OF
ALL 6 SPARK PLUGS DUE TO THE OCCASIONAL MISFIRES ON OTHER CYLINDERS AS
WELL. CUSTOMER DECLINED REPAIRS AT THIS TIME.
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