Cold Start Spark Advance: Description

Some engines use a Cold Start Spark Advance System which is added to the distributor spark advance system. System consists of a Cold Start Spark Advance Ported Vacuum Switch (CSSA PVS), a 235°F coolant PVS, a Distributor Retard Control Valve (DRCV), intake manifold vacuum tap, a carburetor spark port vacuum tap, and on some engines, a Spark Delay Valve (SDV).