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Home >> Buick >> 2002 >> Century Limited >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 3.1L V6 - VIN (J) (On-Vehicle) >> Repair Instructions >> Intake Manifold Replacement - Upper >> Removal Procedure

Removal Procedure

  1. Disconnect the negative battery cable.
  2. Remove the vacuum hoses from the following:
    • Fuel pressure regulator
    • Evaporative emissions (EVAP) canister purge valve
    • Manifold vacuum source
    • Brake booster
    • Heater and air conditioning source
      • Fig 1: Vacuum Hoses
      G01763535Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the electrical connectors from the following:
    • Exhaust Gas Recirculation (EGR) valve
    • Mass Air Flow (MAF) sensor
    • Idle Air Control (IAC) valve
    • Throttle Position (T/P) sensor
    • Evaporative emission (EVAP) canister purge valve
  4. Remove the air cleaner intake duct. Refer to AIR CLEANER INTAKE DUCT REPLACEMENT in ENGINE CONTROLS - REMOVAL & INSTALLATION, OVERHAUL .
  5. Drain the cooling system. Refer to ACCELERATOR CONTROLS CABLE BRACKET REPLACEMENT in ENGINE COOLING SYSTEM .
  6. Remove the accelerator control and cruise control cables with bracket from the throttle body. Refer to ACCELERATOR CONTROLS CABLE REPLACEMENT in ENGINE CONTROLS - REMOVAL & INSTALLATION, OVERHAUL .
  7. Remove the left side spark plug wires from the spark plugs. Refer to SPARK PLUG WIRE REPLACEMENT in ENGINE CONTROLS - REMOVAL & INSTALLATION, OVERHAUL .
  8. Remove the following wiring harnesses from the retainers:
    • Camshaft Position (CMP) sensor wiring harness
    • Left side spark plug wire harness
    • Engine wiring harness
  9. Remove the thermostat bypass pipe coolant hoses (3,4) from the throttle body.
    Fig 2: Thermostat Bypass Pipe Coolant Hoses
    G01763536Courtesy of GENERAL MOTORS CORP.
  10. Remove the ignition coil bracket with the coils. Refer to IGNITION COILS .
  11. Remove the EVAP canister purge valve. Refer to EVAP CANISTER VENT VALVE .
  12. Remove the Manifold Absolute Pressure (MAP) sensor and the bracket. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR .
  13. Remove the Exhaust Gas Recirculation (EGR) valve. Refer to EGR VALVE .
    Fig 3: EGR Components
    G01763537Courtesy of GENERAL MOTORS CORP.
  14. Remove the right upper intake manifold bolts and studs.
    Fig 4: Right Upper Intake Manifold Bolts And Studs
    G01763538Courtesy of GENERAL MOTORS CORP.
  15. Remove the left upper intake manifold bolts.
  16. Remove the upper intake manifold.
    Fig 5: Left Upper Intake Manifold Bolts
    G01763539Courtesy of GENERAL MOTORS CORP.
  17. Remove the upper intake manifold gasket.
    Fig 6: Upper Intake Manifold Gaskets
    G01763540Courtesy of GENERAL MOTORS CORP.
  18. If replacing the upper intake manifold, remove the throttle body. Refer to THROTTLE BODY .
  19. Clean the upper intake gasket mating surfaces.
    Fig 7: Upper Intake Gasket
    G01763541Courtesy of GENERAL MOTORS CORP.
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