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Home >> Chevrolet >> 2002 >> Impala Police >> Repair and Diagnosis >> External Pages >> Different car >> Section 567 (Engine Mechanical - 3.4L V6 - VIN (E) (La1)) >> Repair Instructions >> On-Vehicle Repair instructions >> Intake Manifold Replacement - Upper >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Chevrolet Monte Carlo and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Vacuum Hoses
    GM248101Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  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
  3. Disconnect the electrical connectors from the following:
    • Exhaust gas recirculation (EGR) valve
    • Mass air flow (MAF) sensor
    • Intake air temperature (IAT) sensor
    • Idle air control (IAC) valve
    • Throttle position (T/P) sensor
    • Evaporative emission (EVAP) canister purge valve
  4. Remove the air cleaner intake duct.
  5. Drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
  6. Remove the accelerator control, the cruise control cables with the bracket from the throttle body. Refer to THROTTLE BODY .
  7. Remove the left side spark plug wires from the spark plugs.
  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. Fig 2: View Of Throttle Body Hoses, Heater Outlet Hose & Thermostat Bypass Pipe
    GM622761Courtesy of GENERAL MOTORS CORP.
  9. Remove the thermostat bypass pipe coolant hoses (3,4) from the throttle body.
  10. Remove the ignition coil bracket with the coils. Refer to IGNITION CONTROL MODULE .
  11. Remove the EVAP canister purge valve. Refer to EVAP CANISTER PURGE 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 .
    14. Fig 3: View Of Upper Intake Manifold, Gaskets, Bolts & Stud
    GM813509Courtesy of GENERAL MOTORS CORP.
  14. Remove the upper intake manifold bolts and the stud.
  15. Remove the upper intake manifold.
  16. Remove the upper intake manifold gaskets.
    17. Fig 4: Throttle Body
    GM61827Courtesy of GENERAL MOTORS CORP.
  17. If replacing the upper intake manifold, remove the throttle body. Refer to THROTTLE BODY .
  18. Clean the upper intake gasket mating surfaces.
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