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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1312 (ENGINE MECHANICAL - 3.1L UNIT REPAIR)REPAIR INSTRUCTIONSINTAKE MANIFOLD INSTALLATION - UPPER
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Intake Manifold Installation - Upper

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Intake Manifold Installation - Upper
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 upper intake manifold gaskets.
  2. Install the upper intake manifold.
    NOTE: Refer to FASTENER NOTICE .
  3. Install the upper intake manifold bolts and studs. Apply threadlock GM P/N United States 12345382, GM P/N Canada 10953489 to the threads.

    Tighten 

    Tighten the upper intake manifold bolts and studs to 25 N.m (18 lb ft).

    Fig 1: Upper Intake Manifold
    G01702997Courtesy of GENERAL MOTORS CORP.
  4. Install the EGR valve pipe.

    Tighten 

    Tighten the EGR valve pipe to 25 N.m (18 lb ft).

  5. Install the EGR valve.
  6. Install the EGR valve bolts.

    Tighten 

    Tighten the EGR valve bolts to 25 N.m (18 lb ft).

    Fig 2: EGR Valve
    G01702998Courtesy of GENERAL MOTORS CORP.
  7. Install the map sensor bracket and bolts.

    Tighten 

    Tighten the MAP sensor bracket bolts to 25 N.m (18 lb ft).

  8. Install the MAP sensor.
  9. Install the MAP sensor bolts.

    Tighten 

    Tighten the MAP sensor bolts to 5 N.m (44 lb in).

  10. Install the MAP sensor electrical connector.
    Fig 3: MAP Sensor
    G01702999Courtesy of GENERAL MOTORS CORP.
  11. Install the vacuum lines to the upper intake manifold.
    Fig 4: Vacuum Lines On Upper Intake Manifold
    G01703000Courtesy of GENERAL MOTORS CORP.
  12. Install the throttle cable bracket.
  13. Install the throttle cable bracket bolts.

    Tighten 

    Tighten the throttle cable bracket bolts to 13 N.m (115 lb in).

RENDER: 1.0x

NO RELATED

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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.