Multipoint Injection or Port Fuel Injection is described as injecting fuel into which location?

• A. Directly into the combustion chamber
• B. Into the exhaust manifold
• C. Into the ports of the intake manifold before the intake valves
• D. Only at idle

Answer: (C)

Port injection places the fuel into the intake ports just ahead of the intake valves, inside the intake manifold runners. In multipoint or port fuel injection, each cylinder has its own injector that sprays fuel into its respective intake port so it can mix with incoming air before entering the combustion chamber. This arrangement allows the air–fuel mixture to form in the manifold and during intake, improving control, combustion, and drivability across a range of speeds and loads.

So the description matches injecting fuel into the ports of the intake manifold before the intake valves. Injecting directly into the combustion chamber would be a direct-injection system, and injecting into the exhaust manifold would not deliver fuel to the engine. Fuel injection at idle only is not accurate for MPFI, since it operates across a broad range of operating conditions.