Why is exhaust gas recirculation (EGR) used?
A) To meet emissions standards.
B) To increase fuel efficiency.
C) To regulate charge air temperature.
D) To increase engine horsepower.

Question

Quizplus · Accepted Answer

Exhaust gas recirculation (EGR) is used to meet emissions standards by reducing the amount of nitrogen oxides (NOx) emitted from the vehicle's exhaust. This is done by redirecting a portion of the exhaust gas back into the engine's cylinders, which lowers the combustion temperature and reduces the formation of NOx. EGR does not increase fuel efficiency, regulate charge air temperature, or increase engine horsepower.

Why Is Exhaust Gas Recirculation (EGR) Used