Two problems related to engine noise have been reported for the 2011 BMW 328. The most recently reported issues are listed below.
Recently I drove my car and the engine started to make a high pitched noise. I smelled a gasy burning smell coming from the car. I brought it to a mechanic and he said bolts had come lose in the engine. I asked if it was something I had done and he said he had seen it with many BMW cars out of nowhere.
After the car is stopped at a stop sign and when I try to accelerate the car, it hesitates to move even after I push the gas pedal. The car struggles to move forward and after pressing in hard it moves. The initial delay or the initial response time is huge. The time lag is large. The engine makes noise and will struggle to move. I hope the NHTSA will review the matter with BMW and see what needs to be done.