Wuling light 637 1 black smoke car is still not strong. What is the reason for high fuel consumption?

Hello, insufficient fuel combustion is one of the important reasons for black smoke, or there is something wrong with the filter in the exhaust pipe. It's boring, which further proves that it is caused by insufficient fuel combustion. Clean the intake pipe, intake pipe or valve to be cleaned with cleaning solution, and check whether the fuel nozzle is damaged. If further inspection is needed, clean the cylinder. Perhaps it is because of the use of inferior oil, which leads to excessive garbage accumulation in the port cylinder and necessary cleaning.