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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1313 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST MANIFOLD REPLACEMENT - LEFT (3.8L)INSTALLATION 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 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the new left exhaust manifold gasket.
  2. Install the left exhaust manifold.
    NOTE: Refer to FASTENER NOTICE .
  3. Install the left exhaust manifold bolts, nuts and studs to the left exhaust manifold.

    Tighten 

    Tighten the left exhaust manifold bolts, nuts and studs to 30 N.m (22 lb ft).

    Fig 1: Left Exhaust Manifold, Gasket, Bolts, Nuts & Studs
    G01704040Courtesy of GENERAL MOTORS CORP.
  4. Install the left exhaust manifold heat shield.
  5. Install the left exhaust manifold heat shield nuts.

    Tighten 

    Tighten the left exhaust manifold heat shield nuts to 20 N.m (15 lb ft).

    Fig 2: Left Exhaust Manifold Heat Shield & Nuts
    G01704041Courtesy of GENERAL MOTORS CORP.
  6. Install the left engine lift bracket to the left exhaust manifold.
  7. Install the left engine lift bracket bolt and nut.

    Tighten 

    Tighten the left engine lift bracket bolt and nut to 30 N.m (22 lb ft).

    Fig 3: Left Engine Lift Bracket, Bolt & Nut
    G01704042Courtesy of GENERAL MOTORS CORP.
  8. Install the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT .
  9. Install the left spark plug wires to the left spark plugs. Refer to
  10. Install the exhaust crossover to the left to the left exhaust manifold. Refer to Exhaust Crossover Pipe Replacement (3.1L)  or Exhaust Crossover Pipe Replacement (3.8L) .
  11. Install the left and the right engine mount struts. Refer to ENGINE MOUNT STRUT REPLACEMENT - LEFT and ENGINE MOUNT STRUT REPLACEMENT - RIGHT .
  12. Install the fuel injector sight shield. Refer to FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L36) or FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L67) .
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.