Mazda 323 PCV Valve helps to make the blow-by fumes not linger in the crankcase, which would encourage a cleaner engine and fewer emissions. The Mazda PCV Valve is located between the rocker cover and the intake manifold and consists of a smart one-way gate that almost closes with high engine vacuum to maintain the mixture at equilibrium when idle but opens further with the throttle to pull a second burn of gases into the cylinders. This continuous flow not only prevents sludge but also protects the environment as well as aids in ring sealing since the crankcase pressure is kept at minimal levels, which translates into the easier delivery of power. At Mazda the simple check style of using a spring-loaded design continued to be the standard though subsequent systems usually added an in-line oil separator that strains out droplets prior to vapors rejoining the intake, thereby keeping functionality the same but increasing control over oil, which is the only significant difference in the 323's years of service. The valve is also designed to serve as a flame barrier, preventing any backfire or turbo pressure burst from propelling a flame front or boost into the crankcase. Due to the lack of any planned service time, a couple of shake tests or a visual examination is sufficient to ensure that the PCV Valve continues to swing freely as an impacted one can increase the amount of oil applied and cause rough operation. Mazda made it convenient enough to access, and thus maintenance of their engines by their drivers was easy.
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