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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 REPLACEMENTINSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation 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: Rocker Arm Oil Control Solenoid Valve And O-Ring Removed
    GM828864Courtesy of GENERAL MOTORS CORP.
  1. Install a new O-ring (2) and the rocker arm oil control solenoid valve (1) into the cylinder head.
    2. NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Secure the rocker arm oil control solenoid valve with the one fastener.

    Tighten:  Tighten the fastener to 9 N.m (80 lb in).

  3. Connect the electrical connector to the solenoid valve.
    4. Fig 2: PCV Hose, Breather Hose, EVAP Hose
    GM850214Courtesy of GENERAL MOTORS CORP.
  4. Connect the PCV hose (1) and the PCV breather hose (2) to the engine.
  5. Connect the EVAP hoses.
    6. Fig 3: View Of Engine Upper Cover
    GM828878Courtesy of GENERAL MOTORS CORP.
  6. Install the engine cover (1) to the engine.
  7. Secure the engine cover (1) with the four fasteners.

    Tighten:  Tighten the fasteners to 7 N.m (62 lb in).

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.