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Emission Control System System Description The emission control system includes a Three Way Cata- lytic Converter (TWC), Exhaust Gas Recirculation (EGR) system, Positive Crankcase Ventilation (PCV) system and Tailpipe Emission Inspection Do not smoke during this procedure. Keep any open flame away from your work area. 1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle. 2. Connect a tachometer. 3. Check and adjust the idle speed, if necessary (see ). 4. Warm up and calibrate the CO meter according to the meter manufacturer's instructions. 5. Check idle CO with the headlights, heater blower, rear window defogger, cooling fan, and air condition- er off. NOTE: (Canada) Depress the parking brake pedal. CO meter should indicate 0.1% maximum. Three Way Catalytic Converter (TWC) Description The Three Way Catalytic Converter (TWC) is used to oxides of nitrogen (NOx) in the exhaust gas, to carbon 2 ), dinitrogen (N 2 ) and water vapor. SECONDARY HEATED OXYGEN SENSOR (SENSOR 2) HOUSING THREE WAY Main Menu Table of Contents |