Passat Wagon V6-2792cc 2.8L DOHC (1994)
Fuel Injector: Description and Operation
Fuel Injector (Bosch)
PURPOSE
The fuel injectors supply a precise amount of atomized fuel to the intake system.
LOCATION
The injectors are positioned in the intake manifold, behind the bend.
CONSTRUCTION
The injectors consist of a fuel filter (screen), needle valve, solenoid, magnetic winding and the electrical connector for the ECM.
OPERATION
The ECM grounds the electrical circuit to operate the injectors. The needle valve solenoid opens when the magnetic winding is energized.
The injectors open and close sequentially once per firing cycle during normal engine operation.
The air/fuel mixture is controlled by injection duration, which determines the amount of atomized fuel injected into the intake system.
SIGNAL
The injectors are supplied with 12 VDC by the power supply relay. The ECM controls the ground to operate the injectors.
