What might indicate a malfunctioning PCV valve if no vacuum is felt when removed?

In a scenario where no vacuum is felt when the PCV valve is removed, it suggests that there are issues in the system that could impact the operation of the Positive Crankcase Ventilation (PCV) system.

When the PCV valve is functioning properly, it should allow for the escape of crankcase gases into the intake manifold where they can be re-burned in the engine, creating a vacuum effect. If no vacuum is detected, one possible reason is that the PCV valve itself could be stuck closed. This would prevent the necessary flow of gases and vacuums, indicating a malfunction within the valve.

Another potential reason for the absence of vacuum is a blockage in the hose connecting the intake manifold to the PCV valve. If this hose is plugged, it would not allow for proper air movement and, as a result, prevent the generation of any vacuum.

Since both the sticking of the PCV valve and the plugging of the hose can independently cause the problem of no vacuum, identifying either condition is crucial for diagnosing and resolving the issue within the PCV system. Therefore, acknowledging that both factors could be at play points to the conclusion that both possibilities being correct is a valid assessment.