How to Replace the PCV in a 2005 Trailblazer

The positive crankcase ventilation valve, or PCV valve, in your 2005 Chevy Trailblazer is used primarily for emission reduction purposes. The one way valve vents excess exhaust gasses that blow past the cylinders into the crank case below back into the engine for more complete burning. When this valve becomes too dirty and stops working, excessive pressure can build up inside your Trailblazer's crankcase and cause catastrophic gasket failure from extremely high crankcase pressures and excessive oil burning inside the engine cylinders.

Step 1 - Locate the PCV valve on the driver's side valve cover. It is positioned on the valve cover near the firewall.

Step 2 - Remove the hose clamp that holds the breather hose to the valve using a pair of needle nosed pliers. Squeeze the tabs on the clamp together and pull the clamp off of the hose. Then, pull the clamp off of the end of the hose.

Step 3 - Pull the hose off of the end of the valve with your hands. This hose has a tendency to become stuck on there, so you may need to pull pretty hard.

Step 4 - Twist and pull the PCV valve out of the engine with your hands. You may need to use vise-grip pliers if you're having a hard time getting a grip on the valve. Make sure the grommet on the valve cover stays on the engine and does not come off with the valve.

Step 5 - Insert the new valve with the same orientation as the old valve.

Step 6 - Replace the breather hose and hose clamp.

THINGS YOU'LL NEED: Needle nosed Pliers, Vise grip pliers

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