The Best Ways In Checking and Cleaning the PCV Valve of Your Car


Car makers suggest that PCV valves be cleaned or replaced after somewhere between 20,000 to 50,000 miles of driving. Talk to your owner’s manual to see the location where the PCV valve is located in your vehicle and what the recommended service intervals are. Depending on its type and location, you may be able to check, clean, and replace it yourself, though the valve is generally replaced during scheduled tune-ups. This section has instructions for doing all the jobs.

There are several methods to check whether your PCV valve is functioning properly. Pick the one that seems easiest to suit your needs. (The engine should be idling no matter which method you choose):

Method 1: Get rid of the PCV valve from the valve cover with the hose still attached. Then place your finger across the open end of the hose. If the valve’s working well, you will feel strong suction. Try shaking the valve. If it’s unobstructed, it will rattle. The rattle will probably be indistinct or non-existent if it’s fouled.

One way to examine your PCV valve.

One way to examine your PCV valve.

Method 2: Remove the cap from the oil filler hole on the valve cover and set a stiff piece of paper within the opening. If your PCV valve is in working order, the paper should be sucked against the hole within seconds.

Before you go to the trouble to replace it, try cleaning it to ascertain if that is important, if the valve doesn’t seem to be working properly.

Wash it yourself by immersing it in carburetor cleaner. There must be no gummy deposits or discoloration on a clean valve. If your PCV valve needs to be replaced, invest in a new valve, remove the old one, and insert the new one in its place.

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