Posted on 11/16/2023
We should first start with “What makes direct fuel injection different from other forms of fuel injection?” Fuel injection systems in gasoline engines have evolved over the years due to the constant search for increased fuel economy and reduced exhaust emissions. Many of the improvements coincide with the increased computing power of the Engine Control Module (ECM) aka engine computers. Beginning early in the ‘80s, Throttle Body Fuel Injection (TBI) was introduced as a more precise way to deliver fuel compared to carburation. TBI systems boasted improved cold starting, better throttle response, improved power, and the ability to adapt to different elevations and operating conditions. TBI systems use one to four fuel injectors in a central location in the intake manifold and the fuel is drawn into each cylinder when the intake valves open. The next step in fuel delivery was Port Fuel Injection (PFI), which moves the fuel injectors closer to the intake valve of each cyl ... read more