What is the whine of the throttle valve just after maintenance and cleaning of Arrizo 5?

Arrizo 5 just maintained and cleaned the throttle valve, and there was a whine because of too much carbon deposit. The reason is:

1, the hum caused by too much carbon deposit can be divided into too much carbon deposit in engine, too much carbon deposit in throttle and too much carbon deposit in spark plug. , and can be cleaned in the repair shop.

2. Hum caused by poor filtration, the most common is that the air filter is too dirty, so go to the repair shop to clean or replace it.

3, gasoline purity is not enough to form carbon deposit in the machine, such as 90 # gasoline purity is not as good as 93 # gasoline, by completely replacing high-grade gasoline.

4, spark plug aging, engine problems, cylinder problems, idling problems, need to go to the repair shop for engine maintenance.