M135i Drivetrain Problem

lundi 12 mai 2014

Hello everyone, I'm afraid that my car seems to have caught some sort of a drivetrain issue and I won't be able to find out exactly what is wrong until next week. 'Till then, it's parked :sigh:.



As I was going to work in the morning, at one point I accelerated hard and the engine seemed to start making weird noises. The power delivery wasn't something I was used to. After taking the car to the quick service center, I was advised to take it to the main service (that usually isn't a good sign).



Symptoms thus far are:

  • Louder exhaust noise inside cabin

  • Subtle rasping noise when above 50kph and 2000RPM

  • Weird gearbox shifting (not downshifting like usual)

  • Engine vibration is visible when idle and standstill

  • At idle, RPM's go up and down (+/- 500 RPM)

  • Engine "choked" when I switched from comfort to sport at standstill

  • No engine check light, or any warnings from the system




Vehicle Details:

  • F20 M135i

  • N55 Engine

  • Production Date: March 08 2013

  • 8 Speed Automatic






Has anyone experienced any of these symptoms? Does anyone know what the possible cause could be? I would appreciate any feedback.




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