Bimmerfest BMW banner

whirring sound

  1. E39 (1997 - 2003)
    I was driving along today in my 540i and I began to hear a whirring sound coming from the engine. The sound is in step with the engine, and accelerates when the rpms rise and falls when the rpms decline. it is a deep but slightly high pitched whir, and seems to be coming from the front half of...