[nonovurbizniz]

what does it smell like
clutch - burning peanut butter
oil - well come on if you don't know what that smells like
gear oil - worse much much worse than anything else
gas - thats what your smelling if your running rich

It could also be something simple (my fender well plastic lining was rubbing on my tire (it melted the piss out of it(the liner))

p.s. a honda won't ever run rich or lean (unless you have a vx) unless there is a malfunction with the O2 or computer.

your car is indeed running more gas but the fuel ratio is always optimized through analysis of the O2 sensor's readings.

and as far as the valve cover breather tube ya you should attach it but according to the helm's manual the valve cover breather sucks in it does not blow out... so shouldn't becoming from there.

however i've personally cleaned a trail of obvious oil fume deposits from my intake tube (the trail leads directly from the breather tube inlet to the throttle body) so you never know make sure it's attached any way.