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
1587 reviews
Theodore
16 years of experience
Volkswagen CC L4-2.0L Turbo - 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

Mike

20 years of experience
36 reviews
Mike
20 years of experience
Chevrolet Traverse V6-3.6L - Positive Crankcase Ventilation (PCV) Valve - Jonesboro, Georgia
Mike is very thorough and handled my vehicle like it was his own. There are not enough words to say that give accolades to the work he preformed. I will be using your services again. I am a committed customer to YourMechanic because of Mike Folsom.

Nicholas

11 years of experience
585 reviews
Nicholas
11 years of experience
Volvo V70 L6-3.2L - Positive Crankcase Ventilation (PCV) Valve - Morrisville, North Carolina
Nicholas was very knowledgeable and experienced. He was also very friendly and helpful. Will definitely use again.

Marco

14 years of experience
30 reviews
Marco
14 years of experience
Ford F-150 V8-5.4L - Positive Crankcase Ventilation (PCV) Valve - El Cajon, California
Marco was very professional, courteous and knowledgeable! Work performed quickly and report on condition of truck given

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