The injectors are timely injection of fuel to the cylinder air intakes in accordance with the pulse instructions issued by the ECU
If the injectors are used for a long time, carbon and wear, etc., the sealing cone is damaged, and in severe cases the needle valve card is caused Die.
When the needle valve is stuck in the open position, or when the wiring controlled by the ECU is ironed, the injector continuously injects oil at the intake, causing Part of the cylinder mixture is too thick, so that the exhaust CO, HC content increased.