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Home >> Subaru >> 2006 >> Impreza WRX STi >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection (Fuel Systems) (STI) >> Intake Manifold >> Installation
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Intake Manifold: Installation

  1. Install the intake manifold onto cylinder heads.
    NOTE: Always use new gaskets.

    Tightening torque: 

    25 N.m (2.5 kgf-m, 18.1 ft-lb) 

    Fig 1: Identifying Intake Manifold Bolts
    G04999313
  2. Connect the fuel delivery hose, return hose and evaporation hose.
    NOTE: If fuel hoses or clamps are damaged, replace them with new ones.
    Fig 2: Identifying Fuel Delivery Hose, Return Hose And Evaporation Hose
    G04998278
  3. Connect the connector to the oil pressure switch (B), crankshaft position sensor (C) and engine coolant temperature sensor (A).
    Fig 3: Identifying Oil Pressure Switch And Crankshaft Position Sensor
    G04998268
  4. Connect the connector to the knock sensor.
    Fig 4: Identifying Connector For Knock Sensor
    G04998280
  5. Connect the connector to the camshaft position sensor.
    Fig 5: Identifying Connector For Camshaft Position Sensor
    G04999318
  6. Connect the connector to the ignition coil and ignitor assembly.
    • RH side
      Fig 6: Identifying Connector For Ignition Coil And Ignitor Assembly
      G04998271
    • LH side
      Fig 7: Identifying Connector For Ignition Coil And Ignitor Assembly
      G04998272
  7. Connect the engine harness with clip (A) to the rocker cover.
    • RH side
      Fig 8: Identifying Engine Harness Clip For RH Side
      G04998273
    • LH side
      Fig 9: Identifying Engine Harness Clip For LH Side
      G04998274
  8. Connect the engine harness connector to the front harness connectors.
    Fig 10: Identifying Front Harness Connectors
    G04998267
  9. Connect the engine harness connector to the bulkhead harness connectors.
    Fig 11: Identifying Bulkhead Harness Connectors
    G04999303
  10. Connect the brake booster vacuum hose.
    Fig 12: Identifying Brake Booster Vacuum Hose
    G04998264
  11. Connect the engine coolant hoses to the throttle body.
    Fig 13: Identifying Engine Coolant Hoses
    G04998254
  12. Connect the emission hose (A) and connector (B) to the PCV hose assembly.
    Fig 14: Identifying Emission Hose And Connector
    G04998262
  13. Connect the pressure hose to the intake duct.
    Fig 15: Locating Pressure Hose
    G04998265
  14. Install the power steering pump.
    1. Install the power steering tank on the bracket.
      Fig 16: Locating Power Steering Tank On Bracket
      G04997330
    2. Connect the connector to the power steering pump switch.
      Fig 17: Locating Connector For Power Steering Pump Switch
      G04998257
    3. Install the power steering pump, and tighten the bolts.

      Tightening torque: 

      22 N.m (2.2 kgf-m, 15.9 ft-lb) 

      Fig 18: Tightening Power Steering Pump Bolts
      G04998259
    4. Install the power steering pipe brackets on the intake manifold RH.
      Fig 19: Locating Power Steering Pipe Brackets On Intake Manifold RH
      G04999295
    5. Install the front side V-belt. < Ref. to INSTALLATION , V-belt. >
  15. Install the coolant filler tank. < Ref. to INSTALLATION , Coolant Filler Tank. >
  16. Install the intercooler. < Ref. to INSTALLATION , Intercooler. >
  17. Install the air cleaner element.
  18. Install the air cleaner upper cover and air intake duct as a unit. < Ref. to INSTALLATION , Air Cleaner Case. >
  19. Connect the connector to the fuel pump relay.
    Fig 20: Identifying Connector For Fuel Pump Relay
    G04997433
  20. Connect the battery ground cable to battery.
  21. Lift up the vehicle.
  22. Install the under cover.
  23. Fill the engine coolant. < Ref. to FILLING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant. >