Chevrolet Citation/Omega/Phoenix/Skylark 1980-1985 Repair Guide

Introduction

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Exhaust emission control systems constitute the largest body of emission control devices installed on your X-car. Included in this category are: Catalytic Converter, Early Fuel Evaporation System (EFE), Exhaust Gas Recirculation system (EGR), Thermostatic Air Cleaner (THERMAC), Pulse Air Injection (PULSAIR; 1980), Air Management (AIR; 1981), Deceleration Valve, Computer Controlled Catalytic Converter system (C-4; 1980 Calif. only) and the Computer Command Control system (CCC; 1981 and later). A brief description of each system and any applicable service procedures follows.

 
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