Fuel Injectors

Fig 1: Identifying Injector Coil, Injector Outlet, Ball Valve And Director Plate

Courtesy of SUZUKI OF AMERICA CORP.

The fuel injector is a solenoid device that is controlled by the ECM. When the ECM energizes the injector coil (4), a normally closed ball valve (1) opens, allowing the fuel to flow past a director plate (3) to the injector outlet. The director plate has holes that control the fuel flow, generating a dual conical spray pattern of finely atomized fuel at the injector outlet (2). The fuel from the outlet is directed at both of the intake valves, causing the fuel to become further vaporized before entering the combustion chamber.

The fuel injectors will cause various driveability conditions if the following conditions occur:

• If the injectors will not open
• If the injectors are stuck open
• If the injectors are leaking
• If the injectors have a low coil resistance