Description & Operation: Notes
The Controlled Combustion System (CCS) is a generic term used by General Motors to define a combination of emission systems. The separate emission systems are usually called the Transmission Controlled Spark (TCS) system, Early Fuel Evaporation (EFE) and Exhaust Gas Recirculation (EGR). The CCS uses different controls (depending on application) to regulate ignition timing, EFE and EGR for optimum control of emissions.
NOTE:
Spark control, EFE and EGR controls are tied together, either by vacuum, or electrically, with an EGR and/or EFE system. For more information on EGR or EFE systems, see General Motors Exhaust Gas Recirculation or Early Fuel Evaporation in this section.
The function of all system types is to control distributor advance while vehicle is operating at low speeds or at idle. Although component usage varies between vehicles, their operation is basically similar.