I've got a 2003 v70 wagon. I bought it in June of this year and it ran great and was quiet. After a 3 hour road trip, I noticed a buzzing sound when accelerating. The car has progressively gotten louder and the buzzing is not just exclusive to accelerating, though more prominent when i'm pressing on the gas. When idle it sounds fine. Also, when I first start the car it revs to 2rpms for a minute or two and then drops. I hear this is normal for newer cars, but with the buzzing it's quiet loud. Any ideas?

 

Did you ever find a solution? I have a buzzing sound coming from the engine of my 08 xc70 too