Running an engine with a richer (more fuel,less air)combustion mixture lowers nitrogen oxide emissions from automobiles.The problem is that
A)hydrocarbon emission increases.
B)carbon monoxide emission increases.
C)fuel efficiency decreases.
D)all of the above occur.

Question

Quizplus · Accepted Answer

Running an engine with a richer mixture increases hydrocarbon and carbon monoxide emissions and decreases fuel efficiency.

Running an Engine with a Richer (More Fuel,less Air)combustion Mixture