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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1220 (Engine Mechanical - 3.1L (On-Vehicle)) >> Repair Instructions >> Intake Manifold Replacement - Upper >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. 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 .
  2. Remove the air cleaner intake duct. Refer to 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: Vacuum Hoses
      G01702595Courtesy 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 .
  7. Remove the left side spark plug wires from the spark plugs. Refer to 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. 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 COILS .
  11. Remove the EVAP canister purge valve. Refer to EVAP CANISTER PURGE SOLENOID .
  12. Remove the manifold absolute pressure (MAP) sensor and the bracket. Refer to MANIFOLD ABSOLUTE PRESSURE SENSOR .
    Fig 2: Thermostat Bypass Coolant Hoses
    G01702596Courtesy of GENERAL MOTORS CORP.
  13. Remove the exhaust gas recirculation (EGR) valve. Refer to EGR VALVE .
    Fig 3: EGR Valve
    G01702597Courtesy of GENERAL MOTORS CORP.
  14. Remove the right upper intake manifold bolts and studs.
    Fig 4: Right Upper Intake Manifold Bolts & Studs
    G01702598Courtesy 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
    G01702599Courtesy of GENERAL MOTORS CORP.
  17. Remove the upper intake manifold gasket.
    Fig 6: Upper Intake Manifold Gaskets
    G01702600Courtesy 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: Throttle Body
    G01702601Courtesy of GENERAL MOTORS CORP.
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