Fiero V6-173 2.8L (1986)
Distributor Retard Control: Description and Operation
Distributor Spark Vacuum Retard Delay Valve (DS-VRDV)
This valve is used with a thermal switch that connects the chamber halves (ports 2 and 3) after engine warm-up. When the engine is cold, this valve
delaysthe distributor retard during quick throttle openings. When the engine is warm, the thermal vacuum switch allows the advance unit to respond
directly to ported vacuum changes when the TVS bypasses the delay valve.
