E46 m3 purring problem???

[m3eezer]

Hi guys,

I am having a slight issue with my m3.I have recently noticed that the engine note has a loud electrical purring noise when revved. The noise is quite loud and is becoming an annoyance on my daily commute.

I initially thought the noise was a common sign that the alternator was on its way out, however upon purchasing and fitting a brand new alternator, i am now clueless as the sound is still there!!!

I have brought the car to my local garage and they cant diagnose the problem. Anyone have any ideas??

Edited by m3eezer on Monday 30th November 00:00

[rassi]

With the engine turned off, does the fan turn easily? At idle, can you stop the fan with a rolled-up newspaper? If not, the fan clutch could be seized.

[Chessers]

I had a similar noise but can't recall if it got louder with revving the car.

Mine turned out ot be the power steering pump and was a low humming/whining sound.

Didn't need to be replaced, th egarage owner just said it was a bit loud.

Good luck

[m3eezer]

Thanks for the ideas guys. It may be an issue with the power steering now that you mention it. Has anyone else had any issues with the power steering? I may have to do some research on previous threads. Cheers

[m3eezer]

Ive read that it should take regular ATF? or is there a specialist power steering fluid that is required?