Originally Posted by kupchu9702
I hate to show my ignorance, but what is a pcv valve?
Positive Crankcase Ventilation- Started back in the 60s where they allowed the intake to suck a partial vacuum on the crankcase (usually thru a valve cover back in the day) to remove and burn blow-by gases. The PCV valve was usually stuck in the valve cover and connected to the intake manifold w/ a hose. There was another pipe or hose that was usually connected to the air cleaner and the crankcase (usually via the other valve cover) to allow filtered air to be drawn into the crankcase. Today's engines are different in that some use an orifice instead of a valve and there's probably other differences that I'm not aware of since my shadetree days on newer vehicles are behing me.
Glass half full or half empty to an engineer is simply a glass that was over designed.
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