Car has a loud humming noise. No lights are on. Automatic, 4 cylinder.

What is your question?

When I start it, neighbors are aware. Sounds like I have the car "souped" up, it's kind of a vibrating sound. Is running very well besides that noise

What makes this problem better or worse?

Always there

How long has your 2002 Volkswagen Passat had this problem?

Just got it from a friend, they did not mention any problems. Took very good care of vehicle