Note. Leaking fuel injector valves make it difficult to start a hot engine. Damaged injectors can cause a diesel effect where the engine continues to run with the ignition off.
1. Run the engine to idle.
2. Using a stethoscope, make sure that each individual injector is functioning properly - the presence of clicks indicates that the valves are opening and closing properly.
Note. In the absence of a stethoscope at hand, the check can be made by touch with a screwdriver or finger.
3. If unusual sounds are detected, as well as if they are completely absent, it is necessary to make sure that the supply voltage to the injectors is working properly, measure the resistance of the injectors and check them for tightness.