LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2018 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel Injection System (STI) >> Intake Manifold >> Removal
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Intake Manifold: Removal

  1. Remove the V-belt covers.
    G06344549
  2. Collect the refrigerant from A/C system. Ref. to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>Refrigerant Recovery Procedure>PROCEDURE .
  3. Release the fuel pressure. Ref. 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. Ref. to EXTERIOR/INTERIOR TRIM>Front Under Cover>REMOVAL .
  8. Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. Ref. to COOLING (STI)>Engine Coolant>REPLACEMENT>DRAINING OF ENGINE COOLANT .
  9. Remove the air intake duct. Ref. to INTAKE (INDUCTION) (STI)>Air Intake Duct>REMOVAL .
  10. Remove the intercooler. Ref. to INTAKE (INDUCTION) (STI)>Intercooler>REMOVAL .
  11. Remove the air intake boot.
    G12437186
  12. Remove the air by-pass valve. Ref. to INTAKE (INDUCTION) (STI)>Air By-Pass Valve>REMOVAL .
  13. Remove the generator. Ref. to STARTING/CHARGING SYSTEMS (STI)>Generator>REMOVAL .
  14. Remove the coolant filler tank. Ref. to COOLING (STI)>Coolant Filler Tank>REMOVAL .
  15. Disconnect the A/C pressure hoses from A/C compressor. Ref. to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>Hose and Pipe>REMOVAL .
  16. Disconnect the engine coolant hose from throttle body.
    G08538634
  17. Disconnect the brake booster vacuum hose (A) and pressure regulator vacuum hose (B) from the intake manifold.
    G08538635
  18. Remove the PCV hose from the clip.
    G11571453
  19. Disconnect the vacuum hose (A) and the connector (B) from the PCV hose assembly B.
    G11571454
  20. Disconnect the air control hose (A) from the waste gate actuator, and loosen the clamp which holds the intake duct to the turbocharger.
    G06344555
  21. Remove the engine coolant hose from the water tank pipe.
    G08538640
  22. Remove the tape (A) fixing the leak diagnosis connector harness, and disconnect the leak diagnosis connector from the engine harness.
    G11571457
  23. Disconnect the leak diagnosis connector from the leak diagnosis connector harness.
    G11571458
  24. Remove the engine harness from clip (A).
    G11571459
  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.
    G10264712
  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.
    G08538644
  28. Disconnect the connector from power steering pump switch.
    G08538645
  29. Disconnect the connector from the knock sensor.
    G06344560
  30. Disconnect the connector from the secondary air combination valve.
    G06344561
  31. Disconnect the connector from the intake camshaft position sensor.
    G06344562
  32. Disconnect the connector from the intake oil flow control solenoid valve.
    G06344563
  33. Lift up the vehicle.
  34. Remove the engine harness cover. (right side only.)
    G06344564
  35. Remove the clip holding the engine harness. (Left side only)
    G10264720
  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.
    G08538651
  37. Lower the vehicle.
  38. Remove the clip (A) which hold the engine harness to the rocker cover RH.
    G06344566
  39. Remove the bolts that secure the air duct to the rocker cover LH, and remove the engine harness.
    G08538653
  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.
    G12437208
  41. Remove the intake manifold from cylinder head.
    G08538655
scientia non olet · About LEMON Manuals