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Home >> Subaru >> 2018 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel Injection System (Except For STI) >> Intake Manifold >> Removal
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Intake Manifold: Removal

  1. Remove the collector cover. Ref. to INTAKE (INDUCTION) (EXCEPT FOR STI)>Collector Cover>REMOVAL .
  2. Release the fuel pressure. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel>PROCEDURE>RELEASING OF FUEL PRESSURE .
  3. Disconnect the ground terminal from battery sensor. Ref. to NOTE>BATTERY .
  4. 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.
  5. Lift up the vehicle.
  6. Remove the under cover. Ref. to EXTERIOR/INTERIOR TRIM>Front Under Cover>REMOVAL .
  7. Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. Ref. to COOLING (EXCEPT FOR STI)>Engine Coolant>REPLACEMENT>DRAINING OF ENGINE COOLANT .
  8. Remove the intercooler. Ref. to INTAKE (INDUCTION) (EXCEPT FOR STI)>Intercooler>REMOVAL .
  9. Remove the intake duct No. 2. Ref. to INTAKE (INDUCTION) (EXCEPT FOR STI)>Intake Duct>REMOVAL>INTAKE DUCT NO. 2 .
  10. Remove the intake duct No. 3. Ref. to INTAKE (INDUCTION) (EXCEPT FOR STI)>Intake Duct>REMOVAL>INTAKE DUCT NO. 3 .
  11. Disconnect the PCV hose from the PCV valve.
    G09480039
  12. Disconnect the connector (A) from the throttle body, and disconnect the preheater hose (B) from the throttle body.
    G10266071
  13. Disconnect parts (A) and (B) of the brake booster vacuum hose from the brake vacuum pump and intake manifold, and remove the brake booster vacuum hose from the clip (C).
  14. Remove the brake booster vacuum hose from the clip (D), and place the brake booster vacuum hose aside so that it does not interfere with the work.
    G10266664
  15. Remove the clips securing the PCV pipe and generator cord to the intake manifold.
    G10266077
  16. Disconnect the vacuum control hose and vacuum hose from the vacuum pipe assembly.
    G09479601
  17. Disconnect two vacuum hoses from the canister pipe.
    G09479602
  18. Disconnect the connector from the purge control solenoid valve.
    G09479603
  19. Disconnect the connector from the manifold absolute pressure and intake air temperature sensor.
    G09479604
  20. Disconnect the connector (A) from the tumble generator valve RH.
  21. Disconnect the connector (B) from the tumble generator valve LH, and remove the bolt securing the fuel pipe protector to the intake manifold.
    G10266082
  22. Remove the engine wiring harness clip from the intake manifold.
    G10266083
  23. Remove the bolt securing the EGR pipe to the EGR valve.
    G09479607
  24. Disconnect the fuel delivery tube and evaporation hose.
    CAUTION:
    • Be careful not to spill fuel.
    • Catch the fuel from the tubes using a container or cloth.
    1. Disconnect the quick connector on the fuel delivery tube from the fuel pipe assembly, and remove the clip (A) securing the fuel delivery tube.
      NOTE: Disconnect the quick connector as shown in the figure.
      G12444061
      G10266100
    2. Disconnect the evaporation hose from the fuel pipe assembly.
      G09479610
  25. Remove the bolts securing the fuel pipe assembly to the intake manifold.
    G09479611
  26. Disconnect the fuel delivery pipe (A) and vacuum hose (B), and remove the fuel pipe assembly.
    CAUTION:
    • Be careful not to spill fuel.
    • Catch the fuel from the pipes using a container or cloth.
    NOTE: Disconnect the quick connector as shown in the figure.
    G12444065
    G09479613
  27. Remove the intake manifold from the air intake adapter together with the tumble generator valve assembly.
    G10266091
  28. Remove the vacuum hose assembly from the water pipe assembly.
    G09479615
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