Four of the most important emission control systems used today are the catalytic converter, air injection system, EGR or Exhaust Gas Recirculation and Positive Crankcase Ventilation. The latter system, positive crankcase ventilation or PCV, is designed to collect any gases that leak past the piston rings and into the crankcase. The gases are then recycled back through the combustion chambers for ignition. If these gases are allowed to build up in the crankcase, they would be forced out through other openings, usually creating their own in weak gaskets or seals. The PCV valve makes sure all gas that finds its way into the crankcase is recycled and used. If the PCV valve should become blocked or clogged, it should be replaced as soon as possible.
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