Fuel Injector: Inspection

Warm up engine and let idle.
Listen for sound of each injector running by using sound scope or screwdriver.
WARNING: Fuel is explosive. When working on fuel system, make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away.

CAUTION: Make sure the fuel injectors are firmly seated on the fuel rail to prevent movement and possible damage.

Fig 1: Testing Fuel Injector Operation
Courtesy of KIA MOTORS AMERICA, INC.
If no sound is heard, measure injector resistance.
If injector is OK, check wiring to injector and voltages of ECM terminals 3, 4, 31 and 32.
If removal of injector system is needed, refer to REMOVAL .