2005 Buick Century CustomFACTORY OEM SERVICE PROCEDURE

Removal Procedure

    Fig 1: Identifying Air Intake Duct
    GM69062Courtesy of GENERAL MOTORS CORP.
  1. Partially drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
  2. Remove the air cleaner intake duct. Refer to Air Cleaner Intake Duct Replacement .
    3. Fig 2: View Of IAC Valve Electrical Connector
    GM69056Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the idle air control (IAC) valve electrical connector.
    4. Fig 3: View Of TP Sensor & Electrical Connector
    GM69065Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the throttle position (TP) sensor electrical connector.
  5. Remove the accelerator control cable bracket. Refer to Accelerator Controls Cable Bracket Replacement .
    6. Fig 4: View Of Throttle Body Hoses, Heater Outlet Hose & Thermostat Bypass Pipe
    GM622761Courtesy of GENERAL MOTORS CORP.
  6. Remove the throttle body inlet (3) and the outlet (4) hoses from the throttle body.
    7. Fig 5: Locating Heater Pipe Nut
    GM54419Courtesy of GENERAL MOTORS CORP.
  7. Remove the heater pipe nut at the throttle body.
  8. Remove the nuts and the bolts from the throttle body.
  9. Remove the throttle body assembly.
  10. Remove the throttle body gasket.
    11. NOTE: Do not use solvent of any type when cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as damage to the gasket surfaces and throttle body assembly may result.
    Use care in cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as sharp tools may damage the gasket surfaces.
  11. Clean and inspect the throttle body gasket mating surface.
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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