GM Firebird 1967-1981 Repair Guide



See Figure 1

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Fig. Fig. 1: Emission Control Components - Typical Late Model Firebird

Exhaust emission control systems constitute the largest body of emission control devices installed on your Firebird. Included in this category are: Thermostatic Air Cleaner (THERMAC); Air Injection Reactor System (AIR, 1967-80 models); Air Management System (1981 models); Anti-Dieseling Solenoid; Transmission Controlled Spark (TCS, 1970-74 models); Speed Controlled Spark (SCS); Early Fuel Evaporation System (EFE, 1975-81 models); Exhaust Gas Recirculation (EGR, 1973-81 models); Controlled Combustion System (CCS); Combination Emission Control (CEC) Computer Controlled Catalytic Converter System (C-4); Computer Command Control System (CCC); Mixture Control Solenoid (M/C); Throttle Position Sensor (TPS); Idle Speed Control (ISC); Electronic Spark Timing (EST); Transmission Converter Clutch (TCC); Catalytic Converter and the Oxygen Sensor System. A brief description of each system and any applicable service procedures follows.