Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XFACTORY OEM SERVICE PROCEDURE
Positive Crankcase Ventilation: Service and Repair
Positive Crankcase Ventilation (PCV) Valve Replacement
Removal Procedure
1. Remove the air cleaner assembly.
2. Disconnect the PCV valve hose assembly from the intake manifold.
3. Disconnect the PCV valve hose assembly from the left valve rocker arm cover.
4. Inspect the tube and hose for cuts or cracking.
5. Inspect the grommets in the valve rocker arm covers for cuts or cracking.
6. Replace the PCV hose/tube as required.
Installation Procedure
1. Connect the PCV valve hose assembly to the intake manifold.
2. Connect the PCV valve hose assembly to the left valve rocker arm cover.
3. Install the air cleaner assembly.
Removal Procedure
1. Remove the air cleaner assembly.
2. Disconnect the PCV valve hose assembly from the intake manifold.
3. Disconnect the PCV valve hose assembly from the left valve rocker arm cover.
4. Inspect the tube and hose for cuts or cracking.
5. Inspect the grommets in the valve rocker arm covers for cuts or cracking.
6. Replace the PCV hose/tube as required.
Installation Procedure
1. Connect the PCV valve hose assembly to the intake manifold.
2. Connect the PCV valve hose assembly to the left valve rocker arm cover.
3. Install the air cleaner assembly.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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