Removal and Replacement

Intake Manifold

REMOVAL

1. Set the vehicle on a lift.
2. Remove the V-belt covers.






3. Collect the refrigerant from A/C system.
4. Release the fuel pressure.
5. Disconnect the ground cable from battery.






6. Open the fuel filler lid and remove the fuel filler cap.
7. Lift up the vehicle.
8. Remove the under cover.
9. Drain approximately 3.0 2 (3.2 US qt, 2.6 Imp qt) of coolant.
10. Remove the air intake duct.
11. Remove the air intake boot.






12. Remove the intercooler.
13. Remove the generator.
14. Remove the coolant filler tank.
15. Disconnect the A/C pressure hoses from A/C compressor.
16. Disconnect the vacuum hose (A) and the connector (B) from the PCV hose assembly.






17. Remove the connector from the PCV hose assembly.






18. Remove the bolts which secure the air by-pass pipe and PCV pipe to the intake manifold, and loosen the clamp which connects the throttle body and duct.






19. Remove the duct from the throttle body.
20. Disconnect the engine coolant hose from throttle body.






21. Disconnect the brake booster vacuum hose.






22. Disconnect the air control hose (A) from the wastegate actuator, and loosen the clamp that holds the turbocharger on the intake duct.

- Except for WRX-SS model






- WRX-SS model






23. Disconnect the bulkhead harness connectors from the engine harness connectors.






24. Remove the engine harness connector from the engine harness bracket.






25. Disconnect the connectors from the engine coolant temperature sensor (A), oil pressure switch (B) and crankshaft position sensor (C).






26. Disconnect the connector from power steering pump switch.






27. Disconnect the knock sensor connector.






28. Disconnect the connector from the secondary air combination valve.






29. Disconnect the connector from camshaft position sensor.






30. Disconnect the connector from the oil flow control solenoid valve.






31. Disconnect the air duct from the secondary air pump, and remove the bolts securing the air duct on the rocker cover LH.






32. Disconnect the connector from ignition coil.






33. Disconnect the connector from the front oxygen (A/F) sensor, and remove the clip (A) and stay (B) which hold the engine harness to the rocker cover RH.






34. Attach ST to the fuel delivery pipe and push ST in the direction of arrow mark to disconnect the fuel delivery hose.
ST 42099AE000 QUICK CONNECTOR RELEASE

CAUTION:
- Be careful not to spill fuel.
- Catch the fuel from hoses using a container or cloth.






35. Disconnect the fuel return hose using the ST. ST 18371AA000 CONNECTOR REMOVER

CAUTION:
- Be careful not to spill fuel.
- Catch the fuel from hoses using a container or cloth.

1. Attach ST to the fuel return pipe as shown in the figure.






2. Insert the front side of ST into the quick connector.






3. Insert the back side of ST into the quick connector and push ST in the direction of arrow mark to disconnect the fuel return hose.






36. Remove the clip and disconnect the evaporation hose from the fuel pipe.






37. Remove the intake manifold from cylinder head.






INSTALLATION

1. Install the intake manifold onto cylinder heads.

NOTE: Use a new gasket.






2. Connect the fuel delivery hose, fuel return hose, and evaporation hose.

NOTE: If fuel hoses or clamps are damaged, replace them with new parts.






3. Connect the front oxygen (A/F) sensor connector, and secure the engine harness to the rocker cover RH with clip (A) and stay (B).






4. Connect the connector to the ignition coil.






5. Connect the air duct to the secondary air pump, and install the air duct on the rocker cover LH.






6. Connect the connector to oil flow control solenoid valve.






7. Connect the connector to the engine coolant temperature sensor (A), oil pressure switch (B) and crankshaft position sensor (C).






8. Connect the connector to the knock sensor.






9. Connect the connector to the power steering pump switch.






10. Connect the connectors to camshaft position sensor.






11. Connect the connector to the secondary air combination valve.






12. Install the engine harness connector to engine harness bracket, then connect the bulkhead harness connector to the engine harness connector.






13. Connect the air control hose (A) to the wastegate actuator, and install the turbocharger to the intake duct.

Tightening torque: 3 N.m (0.3 kgf.m, 2.2 ft.lb)

- Except for WRX-SS mode






- WRX-SS model






14. Connect the brake booster vacuum hose.






15. Connect the engine coolant hoses to throttle body.






16. Install the duct to the throttle body.

Tightening torque: 3 N.m (0.3 kgf.m, 2.2 ft.lb)

17. Attach the bolts which secure the air by-pass pipe and PCV pipe to the intake manifold.






18. Attach the connector to the PCV hose assembly.






19. Connect the vacuum hose (A) and the connector (B) to the PCV hose assembly.






20. Install the A/C pressure hoses to A/C compressor.
21. Install the coolant filler tank.
22. Install the generator.
23. Install the intercooler.
24. Install the air intake boot.






25. Install the air intake duct.
26. Connect the ground cable to battery.






27. Lift up the vehicle.
28. Install the under cover.
29. Lower the vehicle.
30. Install the V-belt cover.






31. Fill engine coolant.
32. Charge the A/C system with refrigerant.

INSPECTION

Make sure that the fuel pipe and fuel hose are not cracked and that the connections are tight.