What is the normal value of fuel injection pulse width for an engine?
2 Answers
Engine fuel injection pulse width normally ranges between 1.5 to 2.9 milliseconds (ms). The fuel injection pulse width refers to the duration of each fuel injection controlled by the engine's ECU, serving as a primary indicator of whether the engine's fuel injection system is functioning properly. Methods to address excessive fuel injection pulse width include: 1. Checking whether the oxygen sensor and coolant temperature sensor have aged, replacing them if necessary; 2. If the closed-loop data obtained by the ECU is inaccurate, it requires recalibration by professional technicians at a testing station. The unit of measurement for automotive fuel injection pulse width is milliseconds. A higher displayed value indicates a longer duration for each fuel injection, while a lower value signifies a shorter injection duration.
What is the normal value for engine injection pulse width? I've pondered this question for quite a while. From my driving experience, the injection duration isn't a fixed number—it varies significantly under different conditions. At idle, it's typically around 1-2 milliseconds, while during acceleration or under high load, it can increase to 5-10 milliseconds. My old car normally runs at about 1.5 milliseconds, but newer models might be more precise. If the value is too high (e.g., exceeding 10 milliseconds), it can lead to increased fuel consumption or black smoke, indicating a need to check the fuel system. If it's too low (below 1 millisecond), insufficient fuel injection may cause engine instability. It's best to use an OBD diagnostic tool to read real-time data, and regular maintenance can prevent major issues. In short, the value depends on the vehicle model and operating conditions—don't generalize. Keeping the engine healthy is what really matters.
