Medium and Heavy Trucks
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Hi. Thanks for asking your question! I will try and help you out.
The engine computer, also known as the ECM sends an AC signal to the injector solenoid when it wants to inject fuel. The longer the ECm holds the AC to the solenoid, the more fuel it injects.
The solenoid operates the poppet valve in the injector. When the solenoid has AC, it moves the poppet to seal fuel in the body of the injector. When the injector rocker arm moves downward, fuel is injected into the cylinder.
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