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An injector trigger occurs when the engine control unit (ECU) sends a signal to the fuel injector to open and allow fuel to flow into the engine's combustion chamber. This signal is typically a brief electrical pulse that energizes the injector's solenoid, causing it to open for a specific duration. The timing and duration of this pulse are precisely controlled based on various engine parameters, such as throttle position and RPM, to ensure optimal fuel delivery for combustion.

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