Civic L4-1493cc 1.5L SOHC (16 valve) (1993)
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Fast Idle Valve: Description and Operation
Fast Idle Thermo Valve
PURPOSE
Raises the idle speed when the engine is cold.
OPERATION
Controlled by a thermowax plunger type valve. When the engine coolant is cold, the thermowax contracts the plunger which opens the valve allowing
air to bypass the throttle plate and idle adjusting screw into the intake manifold. When the engine coolant warms up, the valve closes and the bypass
air flow is blocked.