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Home >> Subaru >> 2011 >> Impreza WRX STi Limited >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (Fuel Systems) (W/O STI) (WRX-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 Mounting Bolts Of Cylinder Head
    G07681604Courtesy 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
    G07681605Courtesy of SUBARU OF AMERICA, INC.
  3. Connect the front oxygen (A/F) sensor connector, and secure the engine harness to the rocker cover RH with clip (A) and stay (B).

    Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb) 

    Fig 3: Locating Front Oxygen (A/F) Sensor Connector
    G07681606Courtesy of SUBARU OF AMERICA, INC.
  4. Connect the connector to the ignition coil.
    Fig 4: Locating Ignition Coil Connectors
    G07681607Courtesy of SUBARU OF AMERICA, INC.
  5. Connect the air duct to the secondary air pump, and install the air duct on the rocker cover LH.

    Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb) 

    Fig 5: Locating Air Duct Clamp And Bolt
    G07681608Courtesy of SUBARU OF AMERICA, INC.
  6. Connect the connector to oil flow control solenoid valve.
    Fig 6: Locating Oil Flow Control Solenoid Valve Connector
    G07681609Courtesy of SUBARU OF AMERICA, INC.
  7. Connect the connectors to camshaft position sensor.
    Fig 7: Locating Camshaft Position Sensor Connector
    G07681610Courtesy of SUBARU OF AMERICA, INC.
  8. Connect the connector to the secondary air combination valve.
    Fig 8: Locating Secondary Air Combination Valve Connector
    G07681611Courtesy of SUBARU OF AMERICA, INC.
  9. Connect the connector to the power steering pump switch.
    Fig 9: Locating Power Steering Pump Switch Connector
    G07681612Courtesy of SUBARU OF AMERICA, INC.
  10. Connect the connector (A) to the engine coolant temperature sensor, connector (B) to the oil pressure switch, and the connector (C) to the crankshaft position sensor.
    Fig 10: Identifying Connectors Of Engine Coolant Temperature Sensor, Oil Pressure Switch And Crankshaft Position Sensor
    G07681613Courtesy of SUBARU OF AMERICA, INC.
  11. Install the engine harness connector to engine harness bracket, then connect the bulkhead harness connector to the engine harness connector.
    Fig 11: Locating Bulkhead Harness Connector
    G07681614Courtesy of SUBARU OF AMERICA, INC.
  12. 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 12: Identifying Waste Gate Actuator Air Control Hose With Bolt
    G07681615Courtesy of SUBARU OF AMERICA, INC.
  13. Connect the vacuum hose to the rocker cover.
    Fig 13: Locating Vacuum Hose Of Rocker Cover
    G07681616Courtesy of SUBARU OF AMERICA, INC.
  14. Connect the brake booster vacuum hose.
    Fig 14: Locating Brake Booster Vacuum Hose Clamp
    G07681617Courtesy of SUBARU OF AMERICA, INC.
  15. Connect the vacuum hose to the nipple.
    Fig 15: Locating Vacuum Hose Clamp
    G07681618Courtesy of SUBARU OF AMERICA, INC.
  16. Connect the engine coolant hoses to throttle body.
    Fig 16: Locating Engine Coolant Hoses Clamps
    G07681619Courtesy of SUBARU OF AMERICA, INC.
  17. Install the intake duct to the throttle body.

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

  18. Attach the bolts which secure the air by-pass pipe and PCV pipe to the intake manifold.

    Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb) 

    Fig 17: Locating Air By-Pass Pipe And PCV Pipe Bolts
    G07681620Courtesy of SUBARU OF AMERICA, INC.
  19. Connect the connector (A) to the PCV hose assembly and the connector (B) to the knock sensor.
    Fig 18: Identifying PCV Hose Assembly Connector And Knock Sensor Connector
    G07681621Courtesy 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 duct and air cleaner case. < Ref. to INSTALLATION , Air Cleaner Case. > < Ref. to INSTALLATION , Air Intake Duct. >
  25. Connect the battery ground terminal.
    Fig 19: Connecting Battery Ground Terminal
    G07681622Courtesy of SUBARU OF AMERICA, INC.
  26. Lift up the vehicle.
  27. Install the undercover. < Ref. to INSTALLATION , Front Under Cover. >
  28. Lower the vehicle.
  29. Fill engine coolant. < Ref. to FILLING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant. >
  30. Charge the A/C system with refrigerant. < Ref. to PROCEDURE , Refrigerant Charging Procedure. >
  31. Install the V-belt cover.

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

    Fig 20: Locating V-Belt Cover Screw
    G07681623Courtesy of SUBARU OF AMERICA, INC.
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