Mazda Trucks 1994-1998 Repair Guide

PCV Valve



See Figure 1

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Fig. Fig. 1: Typical PCV system operation

Check the PCV valve frequently to see if it is free and not gummed up, stuck or blocked. To check the valve, remove it from the engine and shake it. It should rattle. It is possible to clean the PCV valve by soaking it in a solvent and blowing it out with compressed air. This can restore the valve to some level of operating order.

This should be used only in emergency situations. Otherwise, the valve should be replaced every 60.000 miles. Always check PCV valve hose for wear or cracks during service procedure.


See Figure 2

Remove the PCV valve by simply disconnecting the vacuum hose from the valve, then pulling the valve from the rocker cover grommet.

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Fig. Fig. 2: Remove the PCV valve from between the hose and the valve cover grommet