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.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1343 (ENGINE CONTROL SYSTEM (INTRODUCTION) -- 1.8L (LNK))REPAIR INSTRUCTIONSROCKER ARM OIL CONTROL SOLENOID VALVE REPLACEMENTREMOVAL PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal Procedure

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Engine Upper Cover

Courtesy of GENERAL MOTORS CORP.

Remove the four fasteners from the engine cover (1).
Remove the engine cover (1) from the engine.

Fig 2: PCV Hose, Breather Hose, EVAP Hose

Courtesy of GENERAL MOTORS CORP.

Disconnect the PCV hose (1) from the PCV valve.
Disconnect the PCV breather hose (2).
Disconnect the EVAP hose (3).
Swing the two PCV hoses and the EVAP hose away from the cylinder head.

Fig 3: Rocker Arm Oil Control Solenoid Valve And O-Ring Removed

Courtesy of GENERAL MOTORS CORP.

Disconnect the electrical connector from the rocker arm oil control solenoid valve.
Remove the fastener retaining the rocker arm oil control solenoid valve to the cylinder head.
Remove the rocker arm oil control solenoid valve (1) and the O-ring (2) from the cylinder head.

RENDER: 1.0x

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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.