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Home >> Subaru >> 1992 >> Legacy Sport >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Fuel System (Fuel Injected) >> Idle Speed >> Thermal Air Valve (Justy)

Thermal Air Valve (Justy)

Coolant temperature-sensitive wax pellet valve allows idle air to by-pass throttle valve. This increases idle RPM during cold engine conditions.