Legacy Outback Wagon F4-2.5L SOHC (2000)
Fuel Injector: Description and Operation
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The MFI system employs a top feed type fuel injector with air assist system.
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The top feed type fuel injector is installed in the fuel pipe to allow cooling of the injector by the fuel.
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The features of this type of fuel injector are as follows:
1. High heat resistance
2. Low driving noise
3. Easy to service
4. Small size
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The fuel injector injects fuel according to the valve open signal received from the ECM.
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The nozzle is attached on the top of the fuel injector. The needle valve is lifted by the solenoid coil through the plunger on arrival of the valve
open signal.
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Since the injection opening, the lifted level of valve and the regulator-controlled fuel pressure are kept constant, the amount of fuel to be injected
can be controlled only by the valve open signal from the ECM.
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Fuel is atomized using air supplied from the idle air control solenoid valve, which contributes to not only higher combustion efficiency and higher
output but also cleaner exhaust emission.