How to Clean a PCV Valve

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  • 0.5-1
  • Beginner
What You'll Need
Car manual
Air compressor

As a car ages, the positive crankcase ventilation or PCV valve will eventually get dirty with built up oil, grease, and water residue, which can clog up the system and hamper its operation. It could cause the valve not to open all the way and cause adverse effects to your car, such as engine damage and decreased fuel efficiency. Follow the simple steps below to effectively clean your PCV valve.

Step 1 - Determine Location

Refer to your car’s owner’s manual to determine the location of the PCV valve. It’s usually found above the engine block, beside the valve cover. A rubber hose covers the valve, which is a cylinder-shaped part.

Step 2 - Remove the PCV Valve

removing a pcv valve

Remove the hose with your hands then cover the valve with a rag and use the pliers to pull it off. Pull it straight up and set it down on the rag.

Step 3 - Clean the Valve

Spray some engine degreaser inside and outside the valve and be generous when you spray. Turn on the air compressor and spray the PCV valve with air.

Step 4 - Reattach the Valve

Push the valve back into its location and wrap it again with the rag and use the pliers again. Don’t push it all the way. Reattach the rubber hose to the PCV valve and push it in.