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I think I know the smell you are talking about. It's not the smell you would expect and has a tinge of oil smell to it right? I have that same smell. What I think is happening is my car burns a lot of oil through the PCV. I switched over to a catch can and, sure enough, quite a bit of oil. I think what is happening is just residual smell from the oil coming through the intake and burning out of the exhaust. I haven't had a chance to seafoam my car yet or clean out the intake, but I imagine it will help a lot. Most of the smell is unburnt fuel though. It only takes a little oil mixed in to smell like crap. Try a catch can and sea foam your car.