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Home >> Jeep >> 1974 >> Cherokee Base, 5.9L Eng VIN N, AWD >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Transmission Controlled Spark (TCS) System >> Description & Operation >> Notes

Description & Operation: Notes

System purpose is to reduce emission of oxides of nitrogen by lowering peak combustion pressure and temperature during power stroke, TCS system consists of a Solenoid Vacuum Valve inserted in vacuum line leading to vacuum advance control unit and a Solenoid Control Switch. In addition, a Coolant Temperature Override Switch is used. Jeeps equipped with 360" or 401" engines and standard cooling also incorporate a Thermal Vacuum Switch.