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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 975 (ENGINE CONTROLS - 4.3L (INTRODUCTION))REPAIR INSTRUCTIONSTHROTTLE BODY ASSEMBLY 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 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .
  2. Remove the air cleaner outlet resonator stud.
    3. Fig 1: View Of Air Cleaner Outlet Resonator Stud
    GM424550Courtesy of GENERAL MOTORS CORP.
  3. Remove the cruise control cable from the throttle pulley.
  4. Remove the cruise control cable from the engine bracket.
    5. Fig 2: View Of Cruise Control Cable
    GM781993Courtesy of GENERAL MOTORS CORP.
  5. Remove the accelerator control cable from the accelerator control bracket.
    6. Fig 3: View Of Accelerator Cable To Accelerator Control Cable Bracket
    GM781990Courtesy of GENERAL MOTORS CORP.
  6. Remove the accelerator control cable from the engine bracket.
  7. Remove the accelerator control cable slug from the throttle pulley.
    8. Fig 4: Identifying Accelerator Cable/Throttle Body Lever
    GM325556Courtesy of GENERAL MOTORS CORP.
  8. Remove the accelerator control cable bracket nuts.
    9. Fig 5: View Of Accelerator Control Cable Bracket
    GM398030Courtesy of GENERAL MOTORS CORP.
  9. Remove the accelerator control cable bracket with the cables attached, from the throttle body.
  10. Position and secure the bracket and cables out of the way.
  11. Disconnect the following electrical connectors:
    • Throttle position (TP) sensor (1)
    • Idle air control (IAC) valve (2)
    12. Fig 6: View Of TP Sensor, IAC Motor, ECT Sensor, Control Port Injector Module & Engine Harness Clip Bolt
    GM782174Courtesy of GENERAL MOTORS CORP.
  12. Remove the throttle body studs.
    13. Fig 7: View Of Throttle Body & Attaching Studs
    GM12852Courtesy of GENERAL MOTORS CORP.
  13. Remove the throttle body.
    14. Fig 8: View Of Throttle Body & Gasket
    GM12853Courtesy of GENERAL MOTORS CORP.
  14. Remove and discard the throttle body seal.
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.