Technician A says there is maximum EGR flow only when the vehicle is at a cruising speed with a very light load. Technician B says instead of an EGR valve many late-model engines use variable valve timing (VVT)to trap some exhaust gases in the combustion chamber. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because EGR (Exhaust Gas Recirculation) flow is typically maximized during cruising speeds with light loads to reduce NOx emissions and improve fuel efficiency. Technician B is also correct because many modern engines use Variable Valve Timing (VVT) to control the amount of exhaust gas that remains in the combustion chamber, effectively reducing the need for a traditional EGR valve. This method also helps in reducing emissions and improving engine efficiency.

Technician a Says There Is Maximum EGR Flow Only When