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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1732 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSFLOOR PANEL HEAT SHIELD 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 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. If vehicle is a crew cab pick-up truck, install the exhaust heat shields to the studs.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  2. Install the exhaust heat shield nuts.

    Tighten 

    Tighten the exhaust heat shield nuts to 9 N.m (80 lb in).

    Fig 1: Installing Exhaust Heat Shield & Nuts (Crew Cab)
    G02133653Courtesy of GENERAL MOTORS CORP.
  3. If vehicle is a extended cab pick-up truck, install the exhaust heat shield (1, 2) to the studs.
  4. Install the exhaust heat shield nuts.

    Tighten 

    Tighten the exhaust heat shield nuts to 9 N.m (80 lb in).

    Fig 2: Installing Exhaust Heat Shield & Nuts (Extended Cab)
    G02133654Courtesy of GENERAL MOTORS CORP.
  5. If vehicle is a regular cab pick-up truck, install the exhaust front heat shield (1) and/or the exhaust heat shield (2) to the studs.
  6. Install the exhaust heat shield nuts.

    Tighten 

    Tighten the exhaust heat shield nuts to 9 N.m (80 lb in).

    Fig 3: Installing Exhaust Front Heat Shield, Exhaust Heat Shield & Nuts (Regular Cab)
    G02133655Courtesy of GENERAL MOTORS CORP.
  7. Install the exhaust front heat shield to the studs.
  8. Install the exhaust front heat shield nuts.

    Tighten 

    Tighten the exhaust heat shield nuts to 9 N.m (80 lb in).

  9. Install the catalytic converter, if necessary. Refer to Catalytic Converter Replacement (4.3L, 4.8L, and 5.3L Engines)  or Catalytic Converter Replacement (6.0L and 8.1L Engines) .
  10. Install the exhaust manifold pipe, if necessary. Refer to Exhaust Manifold Pipe Replacement (6.0, 6.6, and 8.1L Engines) .
    Fig 4: Installing Exhaust Front Heat Shield & Nuts
    G02133656Courtesy of GENERAL MOTORS CORP.
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.