How to check PCV Valve?

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PCV Valve Check:

There are many ways to test a PCV valve:

 

1. Remove the valve and shake it. If it rattles, it means the pintle inside isn’t stuck, and also the valve should flow air. But there are not any thanks to knowing if the spring is weak or broken, or if a buildup of varnish and deposits inside the valve is restricting flow.

2. Check for vacuum by holding your finger over the top of the valve while the engine is idling. This test tells you if the vacuum is reaching the valve, but not if the valve is flowing properly. If you do not feel a vacuum, it means the valve or hose is plugged and desires to get replaced.

3. Use a flow tester to test the performance of the valve. This method is the best because it tests both vacuum and airflow.

 

The volume of air that’s pulled from the crankcase by the PCV system is vital because it takes a specific amount of airflow to get rid of the blowby vapors and moisture. This prevents moisture contamination of the oil and therefore the formation of sludge within the crankcase. However, an excessive amount of airflow can upset the air/fuel mixture within the engine. It can even increase oil consumption.

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