What is the term for the duration that a fuel injector remains open?

The term for the duration that a fuel injector remains open is known as pulse width. This term specifically refers to the width of the electrical signal pulse that is sent to the fuel injector, which controls how long the injector stays open to deliver fuel into the engine. A longer pulse width means the injector is open longer, allowing more fuel to be injected, while a shorter pulse width results in less fuel being delivered.

Understanding pulse width is vital for tuning engine performance, as it directly affects the air-fuel mixture and ultimately the engine's efficiency and power output. Technicians and appraisers often assess pulse width when diagnosing fuel system issues or when optimizing fuel delivery for performance vehicles.