[Tcoat]

Originally Posted by howareyoukk

Update 5: solved the problem by plugging the sound tube from a reply suggested by a member of the forum, though I am still not sure what caused the rattle. The person gave me the advice called it a normal sound.

http://www.ft86club.com/forums/showthread.php?t=118348

Yep. The sound tube is a glorified kazoo and the noises it creates are more annoying than anything.
Check your intake filter. I had a dry leaf that got sucked up in there that made the most bizarre (and absurdly loud) buzzing noise which baffled me for days.