Spark Delay Timing Control System: Description: GLC

This system consists primarily of a delay valve to reduce vacuum to distributor advance during acceleration. Two water thermo switches, a three-way solenoid valve, an igniter and timer unit are also installed to retard ignition timing for 2 minutes when engine coolant temperature is between 50-122°F (10-50°C). As engine temperature increases, timing advances from 1°BTDC to 5°BTDC.