PCV (positive crankcase ventilation), the first smog device mandated to be installed in cars beginning in 1964. PCV captures blowby gases escaping into the crankcases below the pistons and redirects the toxic blowby gases back into the intake manifold through a series of large rubber hoses and a pulsing valve. New PCV hoses are airtight and works well until several years later when the rubber hoses tend to lose it pliabilty ...more »
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