GM Chevy Mid-Size Cars 1964-1988 Repair Guide

GASOLINE ENGINE EMISSION CONTROLS

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See Figure 1

There are three sources of automotive pollutants: Crankcase fumes, exhaust gases and gasoline evaporation. The pollutants formed from these substances all into three categories: unburned hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx). The equipment that is used to limit these pollutants is commonly called emission control equipment.



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Fig. Fig. 1: The vehicle emission control information label includes vacuum diagrams and engine control system adjustment information

 
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