What are the steps involved in testing the PCV valve?

What will be an ideal response?


To test the PCV valve:

PCV valves can be located in several places. They are usually in a grommet in the valve cover or intake manifold or in a hose from the crankcase.  Pull the PCV valve out of its grommet.

With the engine off, remove and shake the PCV valve. It should rattle, although the one used on some smaller engines valves will not, but still work properly.

With the engine running, cover the end of the PCV valve with your thumb or finger or pinch the line leading to it. Engine rpm should drop 50 to 80 rpm, because the slight air leak from normal PCV valve operation has been closed off.

Note: This test will not work on computer-controlled vehicles with idle speed management unless the system is disabled.

Pull the fresh-air hose from the air cleaner. With the engine idling, hold a piece of paper over the end of the hose. After 1 or 2 seconds, vacuum should build and it should remain suspended there.

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