Spark Control System: Description

Jeep vehicles use spark control devices to assist in controlling exhaust emissions. They are spark control Coolant Temperature Override (CTO) valve, Non-Linear Vacuum Regulator (NLVR) valve, Forward Delay Valve, Reverse Delay Valve and on 4-cylinder engines, Vacuum Spark Control Delay Valve (VSCDV). System application depends upon engine size, emissions category and vehicle model.