Hi all - I have a 2004 Mini S that has been displaying an annoying ringing sound that occurs in the vicinity of 2700-3300 rpm. It occurs only when feathering the throttle, not under heavier or full throttle conditions. It occurs in all gears. I don't feel any vibrations, and the cars performance has been fine. It is especially noticeable because that rpm range happens to be right at highway cruising speeds and the cruise control only feathers the throttle at that speed. It appears to be coming from the engine compartment, and is appears to be more linked to the throttle than to rpm since under harder acceleration there is no ringing at the above mentioned rpms. It does not occur when the car is stationary (ie, if I raise the rpms slowly when not in gear, there is no ringing) Any thoughts?