How to Replace a PCV Valve Hose

The Positive Crankcase Ventilation (PCV) valve hose is a hose running from the valve cover on the engine to either the intake air box or the intake manifold. The PCV valve is activated when crankcase pressure rises in the engine when running. These gases raise emissions, so to reduce the emissions the PCV valve routes these excess gases through the PCV valve hose to the intake airbox or intake manifold. The engine reburns these gases, which reduces emissions and keeps the engine running cleaner. A PCV valve hose failure can cause poor fuel economy, a Check Engine Light to come on, and can cause the engine to run rough.

Part 1 of 1: Replacing the PCV valve hose

Materials Needed

location of pcv valve

Step 1: Locate the PCV valve. The PCV valve is located on a valve cover, which is in various locations on the valve cover depending on the make.

The image above shows a PCV valve (1) and the PCV valve hose (2).

an engine cover

Step 2: Remove the engine covers. If there is a engine cover in the way of the PCV valve hose, you will need to remove it.

It will either be retained by nuts and bolts or just snapped into place with rubber insulators.

Step 3: Locate and remove the PCV hose. Once you locate the PCV valve, you will see how the PCV valve hose is attached to the PCV valve and the intake.

Your vehicle may use quick disconnectors, spring hose clamps, or gear type hose clamps.

gear type of hose clamp

Gear type hose clamps are removed by using a ¼ inch or 5/16 inch socket to loosen the hose clamp and slide it from the hose ends.

spring type of hose clamp

Spring hose clamps are removed by using a pair of pliers to collapse and slide the clamp away from the hose end.

disconnect type clamp

Quick disconnectors are removed by releasing and slightly pulling to remove. This requires first examining how the quick disconnect works.

Once you have identified and removed the connector, remove the PCV valve hose by gently twisting and pulling the hose away from the fitting.

Step 4: Install the new PCV valve hose. Position the clamp on the PCV valve hose. The hose will typically slip right over the fitting when installing.

If needed, you can apply a very thin layer of grease to help slip it over the PCV valve or the intake fitting.

Step 5: Clamp the PCV valve hose. Clamp the hose by using either the clamps provided or the old clamps.

Step 6: Secure the clamps. Make sure to secure the hose ends with the type of clamps it is designed to use.

Step 7: Replace any removed covers. Reinstall any engine covers or plastic covers that were removed.

Keeping your vehicle’s PCV valve hose in good working order will help the engine run cleaner and more efficiently. If replacing your PCV valve hose is something you would rather leave to a professional, have one of YourMechanic’s certified technicians perform the replacement.


Next Step

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Recent PCV Valve Hose Replacement reviews

Excellent Rating

(99)

Rating Summary
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Rusty

23 years of experience
467 reviews
Rusty
23 years of experience
Ford Expedition V8-5.4L - PCV Valve Hose Replacement - Arlington, Texas
Knowledgeable, experienced mechanic. Easy to converse with. Explained and reflected potential concerns. Was able to reasonably resolve issue at hand.
Chevrolet Cruze - PCV Valve Hose - Arlington, Texas
Rusty is fantastic! He is very knowledgeable and shoots you straight. He is very thorough, and makes sure everything is done right. I called him just after he left to tell him about a error code that came up, and he came right back to see what the issue was, I didn’t even have to ask. If you want a mechanic that shows up on time and gets the job done right, Rusty is your guy!

Lucas

21 years of experience
885 reviews
Lucas
21 years of experience
Ford Escape L4-2.3L Hybrid - PCV Valve Hose - Pasadena, California
I tasked Lucas with a nightmare of a job. Changing the PCV on my 2005 Ford Escape Hybrid. He already knew that it was a 2.3L Duratec Engine similar to the ones that are in the Mazda 3. He also knew just how long the job would take. He did it all with ease, efficiency and a sense of humor. I was thoroughly impressed how he took the entire manifold off and put it back together without a hitch. Thank you for your services sir, it was greatly appreciated. If anyone is reading this, THIS IS YOUR GUY!
Ford Explorer - PCV Valve Hose - North Hollywood, California
He was very detailed, helpful and a professional. Definitely would call him again, if I had car problems.

Patrick

33 years of experience
1328 reviews
Patrick
33 years of experience
Ford F-150 V8-5.4L - PCV Valve Hose - Dripping Springs, Texas
Patrick has always been on time and is a great communicator. He researched the issue with my truck and found a faster/cheaper solution to the problem.

Michael

16 years of experience
606 reviews
Michael
16 years of experience
Infiniti M35 V6-3.5L - PCV Valve Hose - Atlanta, Georgia
Tech arrived on time, changed the Valve Cover Gasket and the PCV hoses. Michael is very knowledgeable and does quick repairs. I will recommend him to others.

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