Hi JJ, i know this thread is old, but like you seem to know about these cars, i have a vw polo 2003, which since i bought it, has a vibrating sound that any service garage seem to find or know what it is. It comes from the engine area, but it only sounds when the car is running (it doesn't sound when i hit the gas while stopped) and is kind of like the sound of a diesel car, you know, that vibrating sound when your going up a hill and you have to lower a gear... My polo is automatic and is petrol engine, and i've noticed that it only does it around 2,000 revs and i'm hitting the gas pedal softer that the car needs to go faster... do you understand what i mean? Thanks!