The positive crankcase ventilation (PCV) valve is located on the intake manifold below the carburetor. In this case, the word "crankcase" is not quite correct, as the Mazda rotary engine has no crankcase in the normal sense of the term. Rather, the valve, which is operated by intake manifold vacuum, is used to meter the flow of fuel and air vapors through the rotor housings.
TESTING AND REPLACEMENT
The procedures for PCV valve testing and replacement may be found under Routine Maintenance, in General Information And Maintenance .