What is the normal value of fuel injection pulse width?

1 Answers
PaigeDella
07/25/25 4:38pm
The normal value of fuel injection pulse width is between 1.5ms and 2.9ms. The unit of fuel injection pulse width is milliseconds (ms). A larger displayed parameter value indicates that the fuel injector remains open longer each time it sprays fuel, resulting in a richer air-fuel mixture for the engine. Conversely, a smaller displayed parameter value means the fuel injector opens for a shorter duration each time, leading to a leaner air-fuel mixture for the engine. Fuel injection pulse width refers to the duration of each fuel injection controlled by the engine's ECU, which is the most critical indicator of whether the fuel injector is functioning properly. Since the fuel pressure in the engine's fuel system is constant, the fuel flow rate during injection is also constant. Therefore, the amount of fuel injected can only be controlled by the duration of the injection. As electronic fuel injectors in EFI engines are controlled by solenoid valves and the engine operates at high speeds, the injection time is extremely brief. Consequently, the ECU sends a very short pulse signal for fuel injection, and the time width of this signal is the fuel injection pulse width.
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