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Home >> Subaru >> 2021 >> 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.
    G06344549Courtesy of SUBARU OF AMERICA, INC.
  2. Collect the refrigerant from A/C system. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>REFRIGERANT RECOVERY PROCEDURE>PROCEDURE .
  3. Release the fuel pressure. Refer to FUEL INJECTION (FUEL SYSTEMS) (STI)>FUEL>PROCEDURE>RELEASING OF FUEL PRESSURE .
  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. Refer to EXTERIOR/INTERIOR TRIM>FRONT UNDER COVER>REMOVAL .
  8. Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. Refer to COOLING(STI)>ENGINE COOLANT>REPLACEMENT>DRAINING OF ENGINE COOLANT .
  9. Remove the air intake duct. Refer to INTAKE (INDUCTION) (STI)>AIR INTAKE DUCT>REMOVAL .
  10. Remove the intercooler. Refer to INTAKE (INDUCTION) (STI)>INTERCOOLER>REMOVAL .
  11. Remove the air intake boot.
    G13257296Courtesy of SUBARU OF AMERICA, INC.
  12. Remove the air by-pass valve. Refer to INTAKE (INDUCTION) (STI)>AIR BY-PASS VALVE>REMOVAL .
  13. Remove the generator. Refer to STARTING/CHARGING SYSTEMS(STI)>GENERATOR>REMOVAL .
  14. Remove the coolant filler tank. Refer to COOLING(STI)>COOLANT FILLER TANK>REMOVAL .
  15. Disconnect the A/C pressure hoses from A/C compressor. Refer to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>HOSE AND PIPE>REMOVAL .
  16. Disconnect the engine coolant hose from throttle body.
    G08538634Courtesy of SUBARU OF AMERICA, INC.
  17. Disconnect the brake booster vacuum hose (A) and pressure regulator vacuum hose (B) from the intake manifold.
    G08538635Courtesy of SUBARU OF AMERICA, INC.
  18. Remove the PCV hose from the clip.
    G11571453Courtesy of SUBARU OF AMERICA, INC.
  19. Disconnect the vacuum hose (A) and the connector (B) from the PCV hose assembly B.
    G11571454Courtesy of SUBARU OF AMERICA, INC.
  20. Disconnect the air control hose (A) from the waste gate actuator, and loosen the clamp which holds the intake duct to the turbocharger.
    G06344555Courtesy of SUBARU OF AMERICA, INC.
  21. Remove the engine coolant hose from the water tank pipe.
    G08538640Courtesy of SUBARU OF AMERICA, INC.
  22. Remove the tape (A) fixing the leak diagnosis connector harness, and disconnect the leak diagnosis connector from the engine harness.
    G11571457Courtesy of SUBARU OF AMERICA, INC.
  23. Disconnect the leak diagnosis connector from the leak diagnosis connector harness.
    G11571458Courtesy of SUBARU OF AMERICA, INC.
  24. Remove the engine harness from clip (A).
    G11571459Courtesy of SUBARU OF AMERICA, INC.
  25. Disconnect the bulkhead harness connectors from the engine harness connectors.
  26. Lift the claw (A) and remove the engine harness connector from the engine harness bracket.
    G10264712Courtesy of SUBARU OF AMERICA, INC.
  27. 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.
    G08538644Courtesy of SUBARU OF AMERICA, INC.
  28. Disconnect the connector from power steering pump switch.
    G08538645Courtesy of SUBARU OF AMERICA, INC.
  29. Disconnect the connector from the knock sensor.
    G06344560Courtesy of SUBARU OF AMERICA, INC.
  30. Disconnect the connector from the secondary air combination valve.
    G06344561Courtesy of SUBARU OF AMERICA, INC.
  31. Disconnect the connector from the intake camshaft position sensor.
    G06344562Courtesy of SUBARU OF AMERICA, INC.
  32. Disconnect the connector from the intake oil flow control solenoid valve.
    G06344563Courtesy of SUBARU OF AMERICA, INC.
  33. Lift up the vehicle.
  34. Remove the engine harness cover. (Right side only)
    G06344564Courtesy of SUBARU OF AMERICA, INC.
  35. Remove the clip holding the engine harness. (Left side only)
    G10264720Courtesy of SUBARU OF AMERICA, INC.
  36. 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.
    G08538651Courtesy of SUBARU OF AMERICA, INC.
  37. Lower the vehicle.
  38. Remove the clip (A) which hold the engine harness to the rocker cover RH.
    G06344566Courtesy of SUBARU OF AMERICA, INC.
  39. Remove the bolts that secure the air duct to the rocker cover LH, and remove the engine harness.
    G08538653Courtesy of SUBARU OF AMERICA, INC.
  40. 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.
    G13639988Courtesy of SUBARU OF AMERICA, INC.
  41. Remove the intake manifold from cylinder head.
    G08538655Courtesy of SUBARU OF AMERICA, INC.
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