How to judge and whether the nozzle needs cleaning?

There are two main failure modes of fuel injectors:

1, using inferior gasoline, the nozzle is blocked due to too many impurities in the fuel. At this time, we will feel that the power of the car is reduced and the speed is slower.

2. There is carbon deposit on the fuel injector. Serious carbon deposition is caused by insufficient fuel combustion for a long time. For example, if you are used to high-end and low-speed driving, idling for a long time will accelerate the carbon deposition of the engine. After carbon deposition in the fuel nozzle, the fuel atomization is poor and the fuel combustion is insufficient, which makes the engine enter a vicious circle. As a result, engine power decreases, fuel consumption increases, and exhaust emissions exceed the standard.