Mercedes Viano engine idle shake

The cause of engine shake in Mercedes-Benz Viano cars is: the shake problem caused by serious carbon deposits in the engine.

The solution is: go to the 4S shop or auto repair shop in time to clean up the carbon deposit of the engine, which can solve the phenomenon of car engine shaking.

If it is a cold car, it may be caused by excessive carbon deposition in the engine. If it is a hot car, it is a bit complicated to analyze the cause of idle jitter. Engine failure, low pressure in the fuel supply system, and severe carbon build-up in the ignition plug can all lead to idle jitter.

Most of the cold start jitter is caused by poor fuel combustion, the fuel tank has more gum moisture, too much carbon deposition inside the engine, and the cold start is not brought to the combustion chamber and then mixed in the fuel tank is driven into the combustion chamber, and the jitter caused by poor combustion. The gasoline emitted by the cold start injector will be absorbed by carbon deposits, resulting in a dilute mixture for the cold start, which makes the start jitter.

If carbon deposits occur in the valves and intake tracts of the engine, the ECU will make an error in judgment because the carbon deposits can absorb the appropriate amount of fuel. If the computer actually controls the injection of hypothetical 100 parts of oil and gas, but only 90 parts actually enter the cylinder (10 parts are absorbed by carbon deposits), then even if the remaining 90 parts of mixed oil and gas are fully combusted, this cannot achieve the required power, and the phenomenon of jitter is inevitable.

Solution; The best way is to clean the oil circuit, clean it regularly, there is no specific experience in the research and development parameters of the clean engine from the new car, coupled with the continuous improvement of emission standards, can not adapt to the change of fuel, all manufacturers of the engine are unable to solve this jitter problem in the short term, plus the fuel quality is not very good or the initial fuel of the new car factory is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and cause no good fuel to participate in combustion in the later stage. The occurrence of excessive carbon deposits is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits. The use of PNF dope fuel additives can solve the problems caused by carbon deposition.

The engine has serious carbon deposit, the throttle valve is too dirty, or the fuel injector has too much carbon deposit. When there is too much carbon deposit inside the engine, the gasoline sprayed by the cold start injector will be absorbed by the carbon deposit, resulting in the cold start mixture being too thin, making it difficult to start.

Ignition system problems, check the working condition of the spark plug, high-voltage wire and ignition coil, poor ignition system work, spark plug flashing condition is not good, will also lead to this kind of failure.

The oil pressure is unstable, if the oil pump supply pressure is not normal, or the intake pressure sensor has an incorrect value and poor work, it will cause the body to shake.

The engine foot is actually the suspension system of the engine, and the engine foot is responsible for absorbing the subtle shake of the engine when it is running, and if there is a problem with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing shaking when idling.

Hope it helps.

Mercedes-Benz Viano engine idling shake to clean the oil circuit, the oil circuit is dirty after a long time, and it needs to be cleaned. When it's clean, it's burning, and when it's gone. 5000 kilometers can be used once with a Si Youpu fuel additive refueling tank.

The mixer problem, changing the sensor only covers up the problem, not the governance problem. If it appears again in the future, you can add Siyoupu fuel additives to the fuel tank, and it will feel much smoother when you run a tank of fuel, and then continue to use it completely smooth.