Honda 17130-PM6-003 Valve Assembly, Pcv

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Locate the PCV valve. With the engine running at Idle, use pliers to pinch the PVC hose between the valve and the intake manifold. It should be possible to hear the spring loaded valve click shut. If no click is heard, remove the valve from the engine but leave It connected to the intake manifold. A hissing sound should be heard and vacuum should be felt at the valve inlet. If no vacuum is felt, remove the valve from the intake manifold hose. The engine should stall or almost stall. This will Indicate a stuck valve or clogged hose. Check the breather hose for clogging or leaks and replace any defective parts.

With the engine idling at normal operating temperature, gently squeeze shut the PCV hose located at the top of the engine with a pair of pliers, using a rag to protect the surface of the hose. Listen for a clicking sound from the valve.

In abnormal conditions, such as piston ring issues, the system allows excessive blow-by gases to flow back through the crankcase vent tube into the air cleaner for normal combustion.