Weird high pitched buzzing noise when accelerating

[ooihe]

Hi all,

I have this weird high pitched buzzing/growling sound heard somewhere behind the driver side on my 520i. I am very, very sure it wasn't caused by keys/coins left somewhere in the car. I have checked with a few workshops but none able to pinpoint what exactly is it.

Might have to turn up the volume to able to hear it. It's like high frequency buzz/grow? It's hard for me to record it using my phone. If you play it through a phone's speaker, it's easier to hear it.

The weird thing is this sound only appear when I accelerate and when I let go of the gas pedal, the sound goes away like immediately.

 

[ivanfk4]

its because of the e-brake line that touches the driveshaft...it must be the plastic holder that holds ur ebrake line had broken..i use cable tie instead to hold those brake line..