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Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.5L) >> Intake Manifold >> Removal
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Intake Manifold: Removal

  1. Remove the V-belt covers.
    Fig 1: Removing V-Belt Covers
    G06344549Courtesy of SUBARU OF AMERICA, INC.
  2. Collect the refrigerant from A/C system. <Ref. to PROCEDURE , Refrigerant Recovery Procedure.>
  3. Release the fuel pressure. <Ref. to RELEASING OF FUEL PRESSURE , PROCEDURE, Fuel.>
  4. Disconnect the ground cable from battery.
  5. Open the fuel filler lid and remove the fuel filler cap.
    NOTE: This operation is required to release the inner pressure of the fuel tank.
  6. Lift up the vehicle.
  7. Remove the under cover. <Ref. to REMOVAL , Front Under Cover.>
  8. Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. <Ref. to DRAINING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant.>
  9. Remove the air intake duct. <Ref. to REMOVAL , Air Intake Duct.>
  10. Remove the chamber assembly. <Ref. to REMOVAL , Chamber Assembly.>
  11. Remove the intercooler. <Ref. to REMOVAL , Intercooler.>
  12. Remove the air intake boot.
    Fig 2: Locating Air Intake Boot Bolts
    G11571450Courtesy of SUBARU OF AMERICA, INC.
  13. Remove the air by-pass valve. <Ref. to REMOVAL , Air By-pass Valve.>
  14. Remove the generator. <Ref. to REMOVAL , Generator.>
  15. Remove the coolant filler tank. <Ref. to REMOVAL , Coolant Filler Tank.>
  16. Disconnect the A/C pressure hoses from A/C compressor. <Ref. to REMOVAL , Hose and Pipe.>
  17. Disconnect the engine coolant hose from throttle body.
    Fig 3: Locating Engine Coolant Hose Clamps
    G08538634Courtesy of SUBARU OF AMERICA, INC.
  18. Disconnect the brake booster vacuum hose (A) and pressure regulator vacuum hose (B) from the intake manifold.
    Fig 4: Locating Brake Booster Vacuum Hose And Pressure Regulator Vacuum Hose
    G06648976Courtesy of SUBARU OF AMERICA, INC.
  19. Remove the PCV hose from the clip.
    Fig 5: Removing PCV Hose From Clip
    G11571453Courtesy of SUBARU OF AMERICA, INC.
  20. Disconnect the vacuum hose (A) and the connector (B) from the PCV hose assembly B.
    Fig 6: Locating Vacuum Hose Connector
    G11571454Courtesy of SUBARU OF AMERICA, INC.
  21. Disconnect the air control hose (A) from the waste gate actuator, and loosen the clamp which holds the intake duct to the turbocharger.
    Fig 7: Locating Air Control Hose
    G06344555Courtesy of SUBARU OF AMERICA, INC.
  22. Remove the engine coolant hose from the water tank pipe.
    Fig 8: Locating Engine Coolant Hose Clip
    G08538640Courtesy of SUBARU OF AMERICA, INC.
  23. Remove the harness fixing tape (A) and disconnect the leak diagnosis connector harness from the engine harness.
    Fig 9: Locating Leak Diagnosis Connector Harness Fixing Tape
    G11571457Courtesy of SUBARU OF AMERICA, INC.
  24. Disconnect the leak diagnosis connector.
    Fig 10: Locating Leak Diagnosis Connector
    G11571458Courtesy of SUBARU OF AMERICA, INC.
  25. Remove the engine harness from clip (A).
    Fig 11: Removing Engine Harness From Clip
    G11571459Courtesy of SUBARU OF AMERICA, INC.
  26. Disconnect the bulkhead harness connectors from the engine harness connectors.
  27. Lift the claw (A) and remove the engine harness connector from the engine harness bracket.
    Fig 12: Removing Engine Harness Connector From Engine Harness Bracket
    G10264712Courtesy of SUBARU OF AMERICA, INC.
  28. Disconnect the connector (A) from the engine coolant temperature sensor, connector (B) from the oil pressure switch, and connector (C) from the crankshaft position sensor.
    Fig 13: Locating Connector Of Engine Coolant Temperature Sensor
    G11571461Courtesy of SUBARU OF AMERICA, INC.
  29. Disconnect the connector from power steering pump switch.
    Fig 14: Locating Power Steering Pump Switch Connector
    G08538645Courtesy of SUBARU OF AMERICA, INC.
  30. Disconnect the connector from the knock sensor.
    Fig 15: Locating Knock Sensor Connector
    G06344560Courtesy of SUBARU OF AMERICA, INC.
  31. Disconnect the connector from the secondary air combination valve.
    Fig 16: Locating Secondary Air Combination Valve Connector
    G06344561Courtesy of SUBARU OF AMERICA, INC.
  32. Disconnect the connector from the intake camshaft position sensor.
    Fig 17: Locating Intake Camshaft Position Sensor Connector
    G06344562Courtesy of SUBARU OF AMERICA, INC.
  33. Disconnect the connector from the intake oil flow control solenoid valve.
    Fig 18: Locating Intake Oil Flow Control Solenoid Valve Connector
    G06344563Courtesy of SUBARU OF AMERICA, INC.
  34. Remove the air cleaner case. <Ref. to REMOVAL , Air Cleaner Case.>
  35. Disconnect the connector (A) from the exhaust oil flow control solenoid valve. (right side only.)
  36. Remove the engine harness fixing clip (B), clip (C) and clip (D) from the engine harness stay. (right side only.)
    Fig 19: Locating Engine Harness Fixing Clip
    G11571467Courtesy of SUBARU OF AMERICA, INC.
  37. Lift up the vehicle.
  38. Disconnect the connector from the exhaust camshaft position sensor. (right side only.)
    Fig 20: Locating Exhaust Camshaft Position Sensor Connector
    G11571468Courtesy of SUBARU OF AMERICA, INC.
  39. Remove the clip holding the engine harness. (Left side only)
    Fig 21: Locating Engine Harness Clip
    G10264720Courtesy of SUBARU OF AMERICA, INC.
  40. Disconnect connector (A) from the exhaust camshaft position sensor, connector (B) from the exhaust oil flow control solenoid valve, and connector (C) from the ignition coil. (Left side only)
    Fig 22: Locating Exhaust Oil Flow Control Solenoid Valve Connector
    G11571470Courtesy of SUBARU OF AMERICA, INC.
  41. Lower the vehicle.
  42. Remove the bolts that secure the air duct to the rocker cover LH, and remove the engine harness.
    Fig 23: Locating Air Duct Bolts
    G08538653Courtesy of SUBARU OF AMERICA, INC.
  43. Disconnect the fuel delivery hose, fuel return hose and evaporation hose.
    CAUTION:
    • Be careful not to spill fuel.
    • Catch the fuel from hoses using a container or cloth.
    1. Set the ST to the fuel pipe.

      ST 42099AE000 QUICK CONNECTOR RELEASE

    2. Disconnect the quick connector of the fuel delivery hose and fuel return hose by pushing the ST in the direction of the arrow.
    3. Remove the clip and disconnect the evaporation hose from the fuel pipe.
    Fig 24: Disconnecting Evaporation Hose From Fuel Pipe
    G11571472Courtesy of SUBARU OF AMERICA, INC.
  44. Remove the intake manifold from cylinder head.
    Fig 25: Locating Intake Manifold Bolts
    G08538655Courtesy of SUBARU OF AMERICA, INC.
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