Exhaust Emission Systems: Description

Control of emissions is accomplished through modification of engine components. The intake manifold has been modified to recirculate exhaust gases to the intake manifold where they mix with the air/fuel mixture and are burned in the combustion chambers. A system is also provided to eliminate vacuum advance in the lower speed ranges, during idling, and during deceleration. A speed sensitive relay is used in conjunction with a magnetic switch to cut off vacuum to the vacuum advance unit of the distributor.