2004 Pontiac GTO StandardFACTORY OEM SERVICE PROCEDURE

Removal Procedure

  1. Partially drain the cooling system in order to remove the hoses at the throttle body. Refer to Draining and Filling Cooling System in Engine Cooling.
    2. Fig 1: Mass Air Flow/ Intake Air Temperature Air Cleaner Assembly Component View
    GM1372084Courtesy of GENERAL MOTORS CORP.
  2. Remove the air intake duct (3) to the throttle body. Refer to Air Cleaner Assembly Replacement .
    3. Fig 2: View Of IAC Valve & TP Sensor Electrical Connectors
    GM243938Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the throttle position (TP) sensor (2) and the idle air control (IAC) valve (1) electrical connectors.
  4. Disconnect the crankcase ventilation hose from the throttle body.
    5. Fig 3: View Of Accelerator Control Cable
    GM173436Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the accelerator control cable at the throttle body lever.
    6. Fig 4: Identifying Coolant Air Bleed Hose At Throttle Body
    GM220621Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the coolant hose.
    7. Fig 5: View Of Throttle Body
    GM222051Courtesy of GENERAL MOTORS CORP.
  7. Remove the throttle body attaching bolts.
  8. Remove the throttle body and the gasket. Discard the gasket.
  9. Clean the gasket sealing surfaces.
    NOTE: In order to prevent damage to the sealing surfaces, carefully use sharp tools in cleaning the old gasket from the aluminum surfaces.
IMPORTANT:
  • DO NOT soak the throttle body in cold immersion type cleaner. The throttle valve has a factory applied sealing compound (DAG material is applied to the outside edge of the valve and the throttle bore) to prevent air bypass at closed throttle. Strong solvents or brushing will remove the material. To clean the throttle body following disassembly, use a spray type cleaner such as GM X-66A or GM 1052626 (Canadian P/N 993026). Use a shop towel to remove heavy deposits.
  • The TP sensor and the IAC valve are electrical components and should NOT come in contact with solvent or cleaner, as damage may result.
Factory Service Tools

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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.

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