mdkf,

The common replacement interval for many PCV valves is 50,000 miles, yet many engines have never had the PCV valve replaced. Many late model owners' manuals, like the Civic's, do not even have a recommended replacement interval listed for the PCV valve. Although PCV valves can potentially last a very long time, they can still become clogged or faulty given the right circumstances.

If you suspect that your PCV valve is bad then perform this simple test to confirm or contest this assertion:


1) Check the PCV valve, hoses, and connections for leaks or restrictions. (refer to the diagram below)

2) At idle, make sure there is a clicking sound from the PCV valve when the hose between the PCV valve and intake manifold is lightly pinched with your fingers or pliers.

3) If there is no clicking sound, check the PCV valve washer for cracks or damage. If the washer is OK, replace the PCV valve and recheck.

*diagram courtesy of hondapartsnow.com; all rights reserved

 

Thanks stook00!