Hi, I am a retired USAF Colonel and live in Northern Virginia . I own a 2000 e39 m5 w/79k miles. It has developed a pulsing harmonics noise ( whaa, whaa, whaa ) most prominent at 2000 rpm in any gear and out of gear. I have a friend who has a 2001 w/140k miles that also has this noise. This noise can be heard at 4000 rpm also. It is diminished somewhat by the road noise. It purrs like a kitten at idle and runs strong. Anyone have any experience with something like this. Thanks, Bill
most engine noise from a e39 engine could be the vanos but is almost impossible to say with out hearing the noise.
