Ok this is an interesting one,,,,N20 about 30k miles,,,,engine making noise internally,,,,and misfires on cylinder 2 only,,,checked the spark plugs and the ignition coil were ok,,,,no signs of oil burning or fuel soaking,,,if you look at the tip of the valve is missing. The complete tip of the valve is broken,,,the other have is still stuck in the valve spring with the keepers for the valve. I was wondering if the valve seat or the valve guide had dropped,,,there were no signs of damage to the cylinder head. Here is where the valve dropped and hit the top of the piston,,,,you can see the shines spot in the valve pocket where it hit,,,,the bottom line BMW had us replace the whole engine.
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