Technician A says that all port fuel injected systems use the speed density method. Technician B says that throttle body injection systems use the speed density method. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

Technician B is correct because throttle body injection systems often use the speed density method to calculate air intake volume, whereas port fuel injected systems can use either the speed density method or the mass air flow method, not exclusively the speed density method as Technician A suggests.

Technician a Says That All Port Fuel Injected Systems Use