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Originally Posted by alantf
Does it look like this? If so it's the crankcase ventilation. Nothing to do with emission control.
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Crankcase fumes are just a different kind of emission !!
PCV is a form or emission control.......just not the kind that usually comes to mind first.
The old method of just routing the crankcase vent hose to the air cleaner was "cheap and dirty" and didn't really work that good. If you add a little pressure (or suction) at the right point, the system becomes much better at capturing the fumes.....and less likely to plug up your paper air filter.