two very quiet knocks? and speakers... [Archive] - Bimmerfest - BMW Forums

: two very quiet knocks? and speakers...

02-14-2006, 10:20 PM
I was sitting at the stop light the other day and I noticed a very quiet knock. two of them about 2 seconds apart. Now it is all I hear. There is about a 4 second pause and then the knocks. This is at idle. Any suggestions? It sounds pretty regular so I assume it is normal but I could be wrong.

Also does anyone know where to get the mid speaker in the door panel? Mine just went out.

02-15-2006, 12:26 PM
I also have a 99 M3 and have those "knocks". It is like a very low frequency knock, almost like an expansion noise. I haven't been able to determine where it is coming from. Now that I know someone else has this knock, I'm going to investigate a little further.

Anyone else notice this noise?

02-15-2006, 03:54 PM
i have heard a knock from my 95 when in neutral with clutch engaged but i only heard it once or twice while stopped at idle it may not be related but then again it may?