Introduction: Replacing the Positive Crankcase Ventilation (pcv) Valve.

Picture of Replacing the Positive Crankcase Ventilation (pcv) Valve.

The 16 year old pcv valve on my Honda Civic 1999 engine D15B is due for proactive replacement. The manufacturer never states a replacement period but I think a fresh valve will be great on the engine.

First thing is to remove the air filter. Using a 12mm socket I took off the throttle body and disconnected all connectors and accelerator cable. Now I'm ready to work!

Step 1: Removing the Old Pcv.

Picture of Removing the Old Pcv.

Each end if the vacuum hose is held by clamps which need to be moved toward the centre of the hose. Using my birdbeak pliers I gently leveraged the right angled port on the discharge of the pcv valve. I had to take care else the plastic body would Crack.

Once the pcv valve began separating from the engine, I used a flat blade screwdriver to gently Pry it out. The hose end on the intake manifold I had to cut free since it was stuck firm onto the metal nipple.

Step 2: Comparison.

Picture of Comparison.

The new one has the free moving valve that rattles easily when shaken. The old one barely rattles. This is bad for emissions control.

Step 3: Installing the New Pcv.

Picture of Installing the New Pcv.

I rigged up a new hose and clamps to the new pcv valve. I had to remove the accelerator cable bracket to give me more work room. Carefully inserting the pcv into the engine port, I connected the hose to the manifold.

Reinstating the throttle body and fuel injectors harness, the job is now complete!

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