Several shakes of Mercedes-Benz b200 starting.

You may mean that the vehicle has the following three conditions:

1. The engine has serious carbon deposition.

The most common cause of automobile jitter is that the throttle valve is too dirty or the fuel injector has too much carbon deposit. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by a large amount of carbon deposit during cold start, which leads to too thin mixture during cold start and difficult start. In this case, it is easy to start the car only if the gasoline with carbon deposits is saturated. After the car is started, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the engine's real inhalation for combustion, which will make the mixture thicker and the combustible mixture of the engine thinner and thicker, resulting in a cold start. The lower the temperature, the more oil is needed for cold start and the more carbon is deposited, which will affect the success of cold start.

Solution: clean the oil circuit, check whether there is carbon deposit in the idle motor, and clean it.

2. Ignition system problem

Check the working conditions of spark plugs, high-voltage lines and ignition coils. If the ignition system is not good and the spark plug does not jump, it will also lead to such a failure.

Solution: Check the spark plug for excessive carbon deposition and replace the spark plug.

3. The oil pressure is unstable

Such as cleaning engine carbon deposit, cleaning throttle, replacing oil pad and spark plug, etc. But also found idle jitter. I suggest you go to the 4S shop to check whether the fuel supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal, or the value of the intake pressure sensor is incorrect and works poorly, it will cause the body to shake.

Solution: Check the oil pressure and replace parts if necessary.

4. Aging of engine parts

Car jitter is also related to the aging of engine feet (also known as claw pads). The engine foot is actually the damping system of the engine. The engine feet are responsible for absorbing slight vibration when the engine is running. If there is something wrong with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing idle vibration.

Solution: Replace parts.

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