| Fig. 1: Check the PCV valve for vacuum at idle
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| Fig. 2: View of the 1972–84 PCV valve, located
on the intake manifold under the carburetor mounting flange — 1986
models are located on the valve cover
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The function of the PCV valve is to divert blow-by gases from the crankcase to the intake manifold to be burned in the cylinders. The system consists of a PCV valve, an oil separator and the hoses necessary to connect the components.
Ventilating air is routed into the rocker cover from the air cleaner. The air is then moved to the oil separator and from the separator to the PCV valve. The PCV valve is operated by differences in air pressure between the intake manifold and the rocker cover.
