Emission Applications: Notes

Several systems are used to control emission of pollutants. System usage depends on model and engine-transmission combinations. Each system is designed to control a particular vehicle emission. In addition, specially calibrated carburetors, distributors and modified combustion chambers are used with these systems.

NOTE: There are 2 light duty truck emission standards classifications: Light Duty and Heavy Duty Emissions. Light Duty refers to vehicles up through 8,500 lbs. GVW; Heavy Duty refers to vehicles over 8,500 lbs. GVW.