2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

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.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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