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Home >> Subaru >> 2009 >> Impreza WRX STi >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (STI) >> Intake Manifold >> Installation

Intake Manifold: Installation

  1. Install the intake manifold onto cylinder heads.
    NOTE: Use a new gasket.

    Tightening torque: 25 N.m (2.5 kgf-m, 18.4 ft-lb) 

    Fig 1: Locating Intake Manifold
    G06344569Courtesy of SUBARU OF AMERICA, INC.
  2. Connect the fuel delivery hose, fuel return hose, and evaporation hose.
    Fig 2: Identifying Fuel Delivery Hose, Fuel Return Hose And Evaporation Hose
    G06344571Courtesy of SUBARU OF AMERICA, INC.
  3. Fix the engine harness to the rocker cover LH with the air duct.

    Tightening torque: 9 N.m (0.9 kgf-m, 6.6 ft-lb) 

    Fig 3: Locating Air Duct To Rocker Cover LH And Bolts
    G06344567Courtesy of SUBARU OF AMERICA, INC.
  4. Fix the engine harness to the rocker cover RH with clips (A).
    Fig 4: Identifying Engine Harness To Rocker Cover RH With Clips
    G06344566Courtesy of SUBARU OF AMERICA, INC.
  5. Lift up the vehicle.
  6. Connect the connectors to the exhaust camshaft position sensor (A), exhaust oil flow control solenoid valve (B), and ignition coil (C).
    Fig 5: Identifying Exhaust Camshaft Position Sensor, Exhaust Oil Flow Control Solenoid Valve And Ignition Coil Connectors
    G06344565Courtesy of SUBARU OF AMERICA, INC.
  7. Install the engine harness cover, (right side only.)

    Tightening torque: 5 N.m (0.5 kgf-m, 3.7 ft-lb) 

    Fig 6: Identifying Engine Harness Cover And Bolt
    G06344564Courtesy of SUBARU OF AMERICA, INC.
  8. Lower the vehicle.
  9. Connect the connector to the intake oil flow control solenoid valve.
    Fig 7: Locating Intake Oil Flow Control Solenoid Valve Connector
    G06344563Courtesy of SUBARU OF AMERICA, INC.
  10. Connect the connector to the intake camshaft position sensor.
    Fig 8: Locating Intake Camshaft Position Sensor Connector
    G06344562Courtesy of SUBARU OF AMERICA, INC.
  11. Connect the connector to the secondary air combination valve.
    Fig 9: Locating Secondary Air Combination Valve Connector
    G06344561Courtesy of SUBARU OF AMERICA, INC.
  12. Connect the connector to the knock sensor.
    Fig 10: Locating Knock Sensor Connector
    G06344560Courtesy of SUBARU OF AMERICA, INC.
  13. Connect the connector to the power steering pump switch.
    Fig 11: Identifying Power Steering Pump Switch Connector
    G05340076Courtesy of SUBARU OF AMERICA, INC.
  14. Connect the connector to the engine coolant temperature sensor (A), oil pressure switch (B) and crankshaft position sensor (C).
    Fig 12: Identifying Engine Coolant Temperature Sensor, Oil Pressure Switch And Crankshaft Position Sensor Connectors
    G06344558Courtesy of SUBARU OF AMERICA, INC.
  15. Install the engine harness connector to engine harness bracket, then connect the bulkhead harness connector to the engine harness connector.
    Fig 13: Identifying Engine Harness Connectors
    G05954730Courtesy of SUBARU OF AMERICA, INC.
  16. Connect the air control hose (A) to the waste-gate actuator, and install the turbocharger to the intake duct.

    Tightening torque: 3 N.m (0.3 kgf-m, 2.2 ft-lb) 

    Fig 14: Locating Air Control Hose
    G06344555Courtesy of SUBARU OF AMERICA, INC.
  17. Connect the brake booster vacuum hose (A) and pressure regulator vacuum hose (B) to the intake manifold.
    Fig 15: Identifying Brake Booster Vacuum Hose And Pressure Regulator Vacuum Hose
    G06344554Courtesy of SUBARU OF AMERICA, INC.
  18. Connect the engine coolant hoses to throttle body.
    Fig 16: Locating Engine Coolant Hose
    G06344553Courtesy of SUBARU OF AMERICA, INC.
  19. Connect the vacuum hose (A) to the PCV hose assembly and the PCV hose assembly connector (B) to the intake duct.
    Fig 17: Identifying Vacuum Hose
    G06344552Courtesy of SUBARU OF AMERICA, INC.
  20. Install the A/C pressure hoses to A/C compressor. Ref. to INSTALLATION , Hose and Pipe.
  21. Install the coolant filler tank. Ref. to INSTALLATION , Coolant Filler Tank.
  22. Install the generator. Ref. to INSTALLATION , Generator.
  23. Install the intercooler. Ref. to INSTALLATION , Intercooler.
  24. Install the air intake boot.

    Tightening torque: 2.5 N.m (0.3 kgf-m, 1.8 ft-lb) 

    Fig 18: Locating Air Intake Boot
    G06344551Courtesy of SUBARU OF AMERICA, INC.
  25. Install the air intake duct. Ref. to INSTALLATION , Air Intake Duct.
  26. Connect the ground cable to battery.
    Fig 19: Identifying Battery Ground Cable
    G05019586Courtesy of SUBARU OF AMERICA, INC.
  27. Lift up the vehicle.
  28. Install the under cover.
  29. Lower the vehicle.
  30. Install the V-belt cover.

    Tightening torque: 13 N.m (1.3 kgf-m, 9.6 ft-lb) 

    Fig 20: Locating V-Belt Covers
    G06344549Courtesy of SUBARU OF AMERICA, INC.
  31. Fill engine coolant. Ref. to FILLING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant.
  32. Charge the A/C system with refrigerant. Ref. to PROCEDURE , Refrigerant Charging Procedure.