Fuel Injectors
A fuel injector is located on each intake port. The injector is activated by an electric current controlled by the Electronic Control Unit (ECU). When current flows through injector solenoid coil, plunger and needle valve are magnetically attracted, causing injector nozzle to open and fuel to be injected. When current is interrupted, plunger and needle valve are pushed back by spring, closing injector nozzle. See Fig 1 .