S10/T10 P/U 4WD L4-119 1.9L VIN A 2-BBL (1983)
Air Injection Control Valve: Description and Operation
Closed Loop Fuel Control System
The ECM actuates the air switching valve through the vacuum switching solenoid valve. The air switching valve allows air injection into the engine
exhaust ports when engine coolant temperature is below a specific level or during a set period of time after accelerator reaches wide open throttle.
