How many ECS components are required for the California certified 1980 Winnebago with a 7.3L engine?

• A. 4 Components
• B. 5 Components
• C. 6 Components
• D. 7 Components

Answer: (C)

California emission controls for this era are built from several distinct components, and for a California-certified 1980 Winnebago with a 7.3L engine, six ECS components are required. The Positive Crankcase Ventilation (PCV) valve helps keep crankcase emissions from escaping by routing blow-by gases back into the intake. The Exhaust Gas Recirculation (EGR) valve lowers NOx by recirculating a portion of exhaust into the intake. The catalytic converter reduces hydrocarbons and carbon monoxide, and the oxygen sensor provides feedback to adjust the air–fuel mixture for cleaner combustion. The evaporative emissions system captures fuel vapors with a canister and then purges those vapors into the intake via a purge valve. Counting the canister and the purge valve as separate components yields a total of six, which is why that specific setup is listed with six ECS components.