EFI (Electronic Fuel Injection) is a broad term that encompasses all types of fuel injection systems controlled by an electronic control unit (ECU). This includes:
* MPFI (Multi-Point Fuel Injection): Injects fuel into each cylinder individually through a separate injector. This is the most common type of EFI system found in modern vehicles.
* Single-Point Fuel Injection (SPFI): Injects fuel into the intake manifold before it reaches the cylinders. This system is less common and typically found in older vehicles.
* Direct Injection (DI): Injects fuel directly into the combustion chamber, rather than the intake manifold. This system is becoming more popular due to its improved efficiency and performance.
Therefore, there is no difference between EFI and MPFI. They are essentially the same thing, with MPFI being a specific type of EFI system.
Advantages of MPFI:
* Improved fuel economy: More precise fuel delivery results in less wasted fuel.
* Increased power and performance: More efficient combustion leads to higher power output.
* Reduced emissions: Better fuel control reduces harmful emissions.
* Smoother engine operation: More consistent fuel delivery results in a smoother engine idle and acceleration.
* Easier starting: Improved fuel distribution allows for easier starting in cold weather.
Overall, MPFI is considered a superior system to older carburetor-based systems. It offers significant advantages in terms of fuel economy, performance, emissions, and driveability.
