GM Caprice 1990-1993 Repair Guide

EMISSION CONTROLS

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There are three sources of automotive pollutants: crankcase fumes, exhaust gases, and gasoline evaporation. The pollutants formed from these substances fall 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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