How to Replace a Positive Crankcase Ventilation (PCV) Valve

The positive crankcase ventilation (PCV) valve is incorporated into current production engines to aid in improving emissions. As an internal combustion engine operates, it builds up pressure inside the engine, through several different factors. This pressure needs to be dealt with in a way that is safe for the environment. This is done is by recirculating the pressurized vapors back into the engine, where the vapors can be burned off by the heat produced in the combustion process. If your PCV valve is bad, it will result in oil leaking and poor engine performance in general.

Method 1 of 1: Replacing a positive crankcase ventilation (PCV) valve

Materials needed

arrows pointing to pcv valve in valve cover and hose going to intake manifold

Step 1: Locate the positive crankcase ventilation (PCV) valve. Look over the valve cover on the engine. The PCV valve will typically resemble the one pictured above, and have a hose that goes from the PCV valve up to the intake assembly or the throttle body.

thread type pcv valve with a wrench

Step 2: Remove the PCV valve. The is most often accomplished by pulling the PCV valve from the valve cover by hand and then pulling the hose off.

Some will be threaded into the valve cover and you will need to remove the hose before unscrewing the PCV valve to remove it.

Step 3: Compare the replacement PCV valve to the one you removed. They will need to be the same type, same dimensions, and have the same type of hose connection.

You should hear a rattle when you shake the replacement PCV valve. This is because there is a check-ball inside the valve that should be able to move somewhat freely.

Step 4: Install the replacement PCV valve. You should be able to just reverse the removal procedure.

Either place the PCV hose back on and push the replacement back into the valve cover, or thread the replacement into the valve cover, and then reinstall the hose.

The positive crankcase ventilation (PCV) valve directs the pressure created by combustion from the engine’s crankcase back into the intake manifold, or intake tract, via hose or tube. This is an essential function that will cause your engine’s performance to suffer greatly if it is not functioning correctly/

If at any point you feel you could use a hand with replacing a PCV valve in your vehicle, contact a professional technician, such as those available at YourMechanic. YourMechanic has trained and certified repair professionals that can come to your home or place of business and perform the repairs for you.


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Recent Positive Crankcase Ventilation (PCV) Valve Replacement reviews

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Theodore

16 years of experience
1389 reviews
Theodore
16 years of experience
Volkswagen CC - Positive Crankcase Ventilation (PCV) Valve - Renton, Washington
As always Theo did a Great job on my vehicle. I highly recommend him as he is professional personable courteous.
Buick Rendezvous - Positive Crankcase Ventilation (PCV) Valve - Auburn, Washington
Thank you theodore for helping us when no one else would and being a man of your word may God bless you and keep you and stay safe

Attila

19 years of experience
751 reviews
Attila
19 years of experience
Mercedes-Benz E320 - Positive Crankcase Ventilation (PCV) Valve - East Orange, New Jersey
Attila arrived on time and completed the work in a most timely manner. He was professional, courteous and very knowledgeable. If I need service again, I would like to have him perform any that are needed. Thanks!
Hyundai Elantra - Positive Crankcase Ventilation (PCV) Valve - Wayne, New Jersey
He will let you know, exactly what is wrong with your car, and the best ways to go about fixing it or what to do from there.

Stephen

32 years of experience
118 reviews
Stephen
32 years of experience
Mazda CX-7 - Positive Crankcase Ventilation (PCV) Valve - Brighton, Colorado
Kind and polite fella. Showed up on time. Completed work on time. Good experience. First time using yourmechanic . Will definitely use again.

Juan

9 years of experience
192 reviews
Juan
9 years of experience
Mercedes-Benz C300 - Positive Crankcase Ventilation (PCV) Valve - Oviedo, Florida
After seeing 3 other mechanics, to find the source of a whistling noise, and oil dipstick popping out -spewing oil all over my engine 2x! Juan expertly diagnosed the engine like a surgeon! He discovered quickly that I had a clogged PCV valve, which caused the engine to struggle. Juan was expert at replacing this part, and even took the time to show me that part that was clogged by trying to blow air through it. Now that the engine is repaired, my old car feels NEW AGAIN! Thank you so much Juan- you brilliant!!!

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