Engine Intake System (H4SO) (Except Sti): Diagnosis Subaru Impreza GH

INSPECTION

Replace if excessively damaged or dirty.

Scheme 290

Scheme 291

Scheme 292

Scheme 293

1. Disconnect the ground cable from battery.
2. Remove the air intake duct. REMOVAL, Air Intake Duct.>
3. Disconnect the connector (A) from the mass air flow and intake air temperature sensor, and remove the clip (B).
4. Loosen the clamp (A) which connects the air cleaner case to intake boot.
5. Remove the clips (B) from the air cleaner case (front).
6. Remove the air cleaner case (rear) and air cleaner element.
7. Remove the bolt (A) and nut (B) which secure the air cleaner case (front) to the body.
8. Remove the air cleaner case (front).

Check for cracks or loose connections.

Scheme 294

1. Loosen the clamp (A) which connects air intake chamber to throttle body.
2. Loosen the clamp (B) which connects intake boot to air intake chamber.
3. Remove the bolt (C) which secures air intake chamber to the air intake chamber stay.
4. Disconnect the connector (D).
5. Disconnect the blow-by hoses, and then remove air intake chamber.

1. Check for cracks or loose connections.
2. Inspect that no foreign objects are mixed in the air intake chamber.

1. Check for cracks or loose connections.
2. Check that no foreign matter is mixed in air intake duct.

Check for cracks or loose connections.