Technician A says that a fault in the cooling system can cause an increase in engine operating temperatures, and therefore cause a change in NO_xemissions. Technician B says that advanced ignition timing causes the spark to occur too soon while the piston is coming down on the compression stroke. Which technician is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because the cooling system plays an important role in maintaining the engine's operating temperature within the necessary range. A fault in the cooling system can cause the engine to overheat, which can lead to an increase in emissions.

Technician B is incorrect because advanced ignition timing causes the spark to occur too early, which can lead to engine knocking or pinging, but it does not affect the cooling system or emissions.

Technician a Says That a Fault in the Cooling System