I have a 2000 528i with 94000 miles.
When i give it gas it makes a very faint whistle sound. This happens when I am in gear or parked or neutral. It only happens for the beginning gas and if I depress very sharply it won't happen. It has been mentioned in the past it could be the throttle body now. Air is getting into the body somehow when the throttle is opened up. How would I go about testing this, and what is the priority level that I should be giving this for fixing? Is this something that needs to be fixed right away?
You have to have the window down to hear it. I can't place the sound on either side of the car. The whistle is not super loud, and sounds like air flowing out, but with a sharpness to it. It doesn't seem be affecting performance at all.