| Fig. 1: Idle air control valve (1) above the throttle
position sensor (2) — Legacy
|
The IAC valve increases engine speed when engine temperature is low by venting air into the air duct behind the throttle plate.
On the Loyale, the IAC valve is located on top of the engine, in front of intake air duct. On the Justy, it is in-line between the air filter housing and the intake manifold. On the Impreza, Legacy and SVX, the IAC valve is incorporated into the throttle body.
