So, Electronic fuel injectors are electronically controlled valves.

When injectors are energized, an electromagnet moves a plunger that open the valve.

Electronic fuel injectors use engine sensors, a computer and solenoid operated fuel injector to meter and inject fuel. An electronic control unit receives information in the form of electric signals from the sensors.

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A fuel injector is nothing more than a spring-loaded solenoid pintle valve. When energized by the computer, the solenoid pulls the valve open. This allows fuel to spray out of the nozzle and into the engine. When the computer cuts the circuit that powers the injector, the valve inside the injector snaps shut and fuel delivery stops.

The total amount of fuel delivered is controlled by cycling the injector voltage on and off very rapidly. The longer the pulse width, the greater the volume of fuel delivered and the richer the fuel mixture. Decreasing the duration of the injector signal pulse reduces the volume of fuel delivered and leans out the mixture.

So, Dirty fuel injectors are a common problem. As a result, A buildup of fuel varnish deposits inside the tip of the injector spray nozzle can restrict fuel delivery and interfere with the creation of a good spray pattern. This can cause a lean fuel condition and misfiring. Using a Top Tier gasoline that contains adequate levels of injector cleaner can also prevent varnish deposits from forming.

Low fuel pressure will result in poor engine performance, possible misfiring and may prevent the engine from starting.

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