Hello, I started to hear a buzzing sound, I think was the belt tensioner or any accesory (water pump, alternator,..) bearing of the belt, I checked all of them and the belt and is OK. I haven't discovered where side the noise come, I only hear inside the engine.
What do you think is?
you can see a video I've recorded:
http://www.youtube.com/watch?v=p85bzy-3Mjg