Weird "farting" sorta vibrating noise that comes from behind the dash?

[sumo]

I had a concern like that a few times when i worked on a customers Honda. Turned out that one time a mouse died in the blower squirrel cage giving a foul odor and throwing the balance off of the motor. Another time was Debris from acorns and leaves and another time a few of the ribs on the squirrel cage broke and also threw it out of balance when motor was running. Maybe you have a similar concern

 

[JeremyD]

I have this issue as well, wonder what the hell it is ?

 

[JeremyD]

so my noise has been resolved, seems the engine cover was rattling, the stock intake tube has spots for little foam pads to keep from rattling against the cover, mine were all missing. cover removed no rattle.