Quote:
Originally Posted by aythatblackguy
So my 2011 550i has has started to misfire under acceleration. If i drive like a grandma everything is fine but when i down shift to pass someone i get a drivetrain malfunction. Now the bmw dealer i got the car from replaced all 8 injectors and all plugs and coils before i bought it 400 miles ago so what gives.
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Sounds like plugs maybe coils. Not sure why they replaced everything. I had a missfire issues twice and one time happene to be plugs, second time one of the coils was bad.