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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1675 (Engine Mechanical - 3.1L V6 - VIN (J)) >> Repair Instructions >> On-Vehicle repair Instructions >> Intake Manifold Replacement - Upper >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE Battery.
  2. Remove the air cleaner intake duct.
  3. Remove the accelerator controls cable bracket with the accelerator control and the cruise control cables.
  4. Remove the vacuum hoses from the following:
    • Fuel pressure regulator
    • Evaporative emissions (EVAP) canister purge valve
    • Manifold vacuum source
    • Brake booster to the upper intake manifold
    • Windshield washer system
    Fig 1: Removing Vacuum Hoses
    G01967850Courtesy of GENERAL MOTORS CORP.
  5. 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
  6. Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
  7. Remove the left side spark plug wires from the spark plugs. Refer to SPARK PLUGS in Removal & Installation.
  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: Removing Thermostat Bypass Pipe Coolant Hoses From Throttle Body
    G01967851Courtesy of GENERAL MOTORS CORP.
  10. Remove the ignition coil bracket with the coils. Refer to IGNITION COILS in Removal & Installation.
  11. Remove the EVAP canister purge valve. Refer to EVAP CANISTER PURGE VALVE in Removal & Installation.
  12. Remove the manifold absolute pressure (MAP) sensor and the bracket. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR in Removal & Installation.
  13. Remove the exhaust gas recirculation (EGR) valve. Refer to EGR VALVE in Removal & Installation.
  14. Remove the upper intake manifold bolts and the stud.
  15. Remove the upper intake manifold.
  16. Remove the upper intake manifold gaskets.
    Fig 3: Removing Upper Intake Manifold, Bolts & Gaskets
    G01967852Courtesy of GENERAL MOTORS CORP.
  17. If replacing the upper intake manifold, remove the throttle body. Refer to THROTTLE BODY in Removal & Installation.
    Fig 4: Removing Throttle Body & Mounting Bolts
    G01967853Courtesy of GENERAL MOTORS CORP.
  18. Clean the upper intake gasket mating surfaces.
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