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Home >> Subaru >> 2008 >> Impreza WRX STi >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (H4DOTC) >> Intake Manifold >> Assembly

Intake Manifold: Assembly

  1. Install the tumble generator valve assembly onto intake manifold.
    NOTE: Use new O-rings.

    Tightening torque: 

    8.3 N.m (0.85 kgf-m, 6.1 ft-lb) 

    Fig 1: Locating Tumble Generator Valve Assembly And Intake Manifold
    G05340123Courtesy of SUBARU OF AMERICA, INC.
  2. Install the fuel injector pipe.
  3. Connect fuel hoses to fuel injector pipes on both sides, and secure them with the clamps.

    Tightening torque: 

    1.25 N.m (0.13 kgf-m, 0.94 ft-lb) 

    Fig 2: Identifying Fuel Injector Pipe, Fuel Hose And Pipe
    G05340122Courtesy of SUBARU OF AMERICA, INC.
  4. Tighten the bolts which secure the fuel injector pipe RH to the lower side of the intake manifold.

    Tightening torque: 

    6.4 N.m (0.65 kgf-m, 4.7 ft-lb) 

    Fig 3: Locating Fuel Injector Pipe RH And Lower Side Of Intake Manifold
    G05340121Courtesy of SUBARU OF AMERICA, INC.
  5. Tighten the bolts which secure fuel injector pipe onto intake manifold.

    Tightening torque: 

    6.4 N.m (0.65 kgf-m, 4.7 ft-lb) 

    Fig 4: Identifying Fuel Injector Pipe And Intake Manifold
    G05340120Courtesy of SUBARU OF AMERICA, INC.
  6. Install the fuel injector.
    • RH side
    Fig 5: Identifying Fuel Injector (RH Side)
    G05340118Courtesy of SUBARU OF AMERICA, INC.
    • LH side
    Fig 6: Identifying Fuel Injector (LH Side)
    G05340119Courtesy of SUBARU OF AMERICA, INC.
  7. Tighten the bolts which secure fuel injector pipe onto intake manifold.

    Tightening torque: 

    19 N.m (1.9 kgf-m, 14.0 ft-lb) 

    • LH side
    Fig 7: Identifying Fuel Injector Pipe Onto Intake Manifold (LH Side)
    G05340117Courtesy of SUBARU OF AMERICA, INC.
    • RH side
    Fig 8: Identifying Fuel Injector Pipe Onto Intake Manifold (RH Side)
    G05340116Courtesy of SUBARU OF AMERICA, INC.
  8. Tighten the bolt which holds the fuel injector pipe LH to the front side of the intake manifold, and connect the pressure regulator vacuum hose to the intake manifold.

    Tightening torque: 

    6.4 N.m (0.65 kgf-m, 4.7 ft-lb) 

    Fig 9: Identifying Fuel Injector Pipe LH And Intake Manifold
    G05340115Courtesy of SUBARU OF AMERICA, INC.
  9. Install PCV pipe (A), harness assembly (B) and intake duct (C) to the intake manifold.

    Tightening torque: 

    6.5 N.m (0.66 kgf-m, 4.8 ft-lb) 

    Fig 10: Identifying PCV Pipe, Harness Assembly And Intake Duct
    G05340114Courtesy of SUBARU OF AMERICA, INC.
  10. Connect the connector to the fuel injector and the tumble generator valve assembly.
    Fig 11: Locating Tumble Generator Valve Assembly
    G05340113Courtesy of SUBARU OF AMERICA, INC.
  11. Install the throttle body to the intake manifold.
    NOTE: Use new O-rings.

    Tightening torque: 

    8 N.m (0.8 kgf-m, 5.9 ft-lb) 

    Fig 12: Identifying Throttle Body To Intake Manifold
    G05017734Courtesy of SUBARU OF AMERICA, INC.
  12. Connect the connector to the throttle position sensor.
    Fig 13: Identifying Throttle Position Sensor
    G05017732Courtesy of SUBARU OF AMERICA, INC.
  13. Connect the evaporation hose to the purge control solenoid valve 2.
    NOTE: Connect the evaporation hose as shown in the figure.
    Fig 14: Connecting Evaporation Hose
    G05660457Courtesy of SUBARU OF AMERICA, INC.
  14. Connect the connectors to the wastegate control solenoid valve, manifold absolute pressure sensor and purge control solenoid valve 2, and install the solenoid valve bracket assembly to the intake manifold.

    Tightening torque: 

    T1: 17 N.m (1.7 kgf-m, 12.5 ft-lb) 

    T2: 19 N.m (1.9 kgf-m, 14.0 ft-lb) 

    Fig 15: Identifying Wastegate Control Solenoid Valve And Manifold Absolute Pressure Sensor
    G05660458Courtesy of SUBARU OF AMERICA, INC.
  15. Connect the filter assembly. 
    Fig 16: Identifying Filter Assembly
    G05340109Courtesy of SUBARU OF AMERICA, INC.
  16. Connect the evaporation hose and the connector to the purge control solenoid valve 1, and install the purge control solenoid valve 1 to the intake manifold.
    NOTE: Connect the evaporation hose as shown in the figure.
    Fig 17: Identifying Evaporation Hose
    G05660460Courtesy of SUBARU OF AMERICA, INC.

    Tightening torque: 

    6.4 N.m (0.65 kgf-m, 4.7 ft-lb) 

    Fig 18: Identifying Purge Control Solenoid Valve And Intake Manifold
    G05340108Courtesy of SUBARU OF AMERICA, INC.
  17. Install the fuel pipe protector RH to the intake manifold.

    Tightening torque: 

    19 N.m (1.9 kgf-m, 14.0 ft-lb) 

    Fig 19: Locating Fuel Pipe Protector RH And Intake Manifold
    G05340107Courtesy of SUBARU OF AMERICA, INC.
  18. Install the fuel pipe protector LH to the intake manifold, and install the engine ground terminal to the fuel pipe protector LH.

    Tightening torque: 

    19 N.m (1.9 kgf-m, 14.0 ft-lb) 

    Fig 20: Locating Engine Ground Terminal And Fuel Pipe Protector LH
    G05340106Courtesy of SUBARU OF AMERICA, INC.