Technician A says cylinder misfiring causes a significant increase in HC emissions. Technician B says a dirty air filter may cause high CO emissions. Who is correct?

Question

Quizplus · Accepted Answer

Both statements are correct. Cylinder misfiring leads to unburned fuel exiting the engine, significantly increasing hydrocarbon (HC) emissions. A dirty air filter restricts airflow to the engine, causing a rich fuel mixture and potentially higher carbon monoxide (CO) emissions.

Technician a Says Cylinder Misfiring Causes a Significant Increase in HC