GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

ENGINE EMISSION CONTROLS

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See Figures 1 and 2

There are three sources of automotive pollutants: Crankcase fumes, exhaust gases and gasoline evaporation. The pollutants formed from these substances can be grouped into three categories: unburned hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NO x ). The equipment that is used to limit these pollutants is commonly called emission control equipment.

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Fig. Fig. 1: Some vehicle emission control labels show engine control system adjustment information...



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Fig. Fig. 2: ... while other labels show vacuum routing diagrams

 
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