I just bought a 2003 A4 Avant Quattro 5-speed manual and I am hearing funny noises from what seems to be under that car. I'll do my best to describe it...

It is a low-tone groan at slow speeds, but the groan gets higher in pitch when I speed up. Also, the groan starts when the gas pedal is just maintaining speed (not coasting, but not accelerating) and when the tranny is in gear. If the engine and tranny are under load (accelerating or maintaining speed up a hill) or if I release the gas pedal, the groan goes away. I only hear it when I VERY slightly depress the gas pedal.

I realize this could be a lot of things, but the issue is making me ULTRA anxious. I hate to say it, but I'm not sure if I trust the dealer that sold me the car to tell me what the real problem is. So, I looks to you guys.

I would really appreciate any ideas.

Thanks!!