240 L4-2127cc 2.1L SOHC Turbo B21FT FI (1982)
Exhaust Gas Recirculation: Description and Operation
B21A Engine W/ Manual Transmission (Canada Only)
Fig. 118 EXHAUST GAS RECIRCULATION SYSTEM (WITH MANUAL TRANSMISSION , CANADA MARKET ONLY)
The exhaust gas recirculation system is used to reduce oxides of nitrogen (NOx) emitted from the engine exhaust. The formation of NOx occur at very
high temperatures, during the peak temperature period of the combustion process. To control and reduce the amount of NOx, only a slight reduction in
peak combustion temperature is necessary. This reduction is done by introducing small amounts of an inert gas into the combustion process. If too
much inert gas is allowed into the combustion process (example stuck E.G.R. valve), the engine will idle roughly or not at all.
The engine exhaust provides a continuous supply of relatively inert gases that can be easily recirculated into the intake manifold. To recirculate these
exhaust gases, a connection is made between the exhaust and intake manifolds. Fig. 118.
