Manometer

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Digital manometer can detect a plugged pcv valve

The PCV valve flows at different rates, under various driving conditions. For instance, at high engine vacuum, valve should hardly flow at all. An Excess flow at an engine idle will interfere with smooth running. With a lower intake vacuum, flow through the PCV valve increases. A quality auto repair shop will have a tool called a manometer. The manometer measures the very small negative pressure in related to flow. Testing is done at the engine idle speed, under acceleration and under a positive intake condition.

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