Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How to Replace a Positive Crankcase Ventilation (PCV) Valve

How to Replace a Positive Crankcase Ventilation (PCV) Valve

pcv valve located in the valve cover

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...

Related questions

Q: I have a 2003 Subaru Forester and upon starting this morning it ran fine for a minute or two. Then the Check Engine Light came on.

Too much air flowing into the intake causes the engine to lean out too much air in relation to the fuel and misfire. At an idle, the PCV valve restricts air flow, to reduce this problem. At high manifold vacuum...

Q: My timing belt broke, is there a chance there is no damage? 2000 Dodge Neon

Hi there - yes, the 2.0 liter engines are "interference", which means there are likely some bent valves at least. As to noise, yes, there was likely some noise, but it would have been so instantaneous as to your hardly...

Q: I was told I have oil coming through the air intake does that mean I need a new engine??

If your PCV valve is clogged then you may get excessive blow by of combustion gases and oil into the intake system. You should have the PCV valve replaced and intake cleaned out of oil. If problem continues then you...