Shanghai BMW engine repair/Shanghai Mercedes-Benz fault repair

The BMW engine is not working properly
Fault phenomenon: A BMW car is equipped with an inline strong-cylinder engine, but the engine is unstable and cannot be refueled at both rapid and slow accelerations. The gun suddenly backfired and black smoke came out of the exhaust pipe. After adjusting and cleaning the fuel injector and gasoline filter, the fault remained the same. The cause of the fault was that the engine was running unstable and black smoke was emitted from the exhaust pipe, indicating that the mixture was not fully burned in the engine cylinder. This phenomenon was caused by many reasons. When the engine is working normally, the mixture is fully burned, generating a large amount of heat energy to push the piston to do work. The emissions are mainly water and carbon dioxide, so the exhaust gas is basically colorless and odorless. When the engine is not working properly, the exhaust gas It contains a large amount of carbon monoxide hydrocarbons and various particles, and is black in color, which is more obvious during rapid acceleration.
Troubleshooting and Troubleshooting In the above situation, you should first check whether the spark plug has excessive carbon deposits, electrode ablation and other abnormal phenomena
If not, then check the working pressure of each cylinder, which should generally be greater than the cylinder pressure if If it is too low, the mixture will not be fully compressed, resulting in poor combustion. At this time, you should check the cylinder gasket, valve piston ring, and analyze and determine the cause of air leakage.
If no abnormality is found in the above steps, the engine control system should also be checked.
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