October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Throttle Body

Subaru throttle bodies are equipped with an idle speed adjusting screw and a fast idle speed adjusting screw. During A/C operation, a Fast Idle Compensating Solenoid (FICD) opens up to by-pass additional air to the intake manifold to maintain engine idle speed. Throttle bodies are also equipped with dashpots to prevent engine stall during deceleration.