What causes the car to shake when it is refueling and accelerating?

There are several reasons for the body shaking during acceleration:

1, serious carbon deposit in the engine: The most common reason for car jitter is that the throttle 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 the carbon deposit during the cold start, which leads to the lean mixture during the cold start and makes it difficult to start. In this case, only the gasoline adsorbed by carbon deposits can easily enter the car when it is saturated, and the gasoline adsorbed on carbon deposits after entering the car will be sucked into the cylinder by the vacuum suction of the engine for combustion, making the mixture thicker and the combustible mixture of the engine thinner and thinner, resulting in idling jitter after cold start. The lower the temperature, the more oil is needed for cold start and the more carbon is deposited, which affects the stability of start-up.

2. There is something wrong with the ignition system: check the working conditions of the spark plug, high-voltage wire and ignition coil. Poor ignition system and poor ignition conditions of spark plugs can also lead to such failures.

3. Unstable oil pressure: If the engine carbon deposit has been cleaned, the throttle valve has been cleaned, the oil pad and spark plug have been replaced, and the car body is shaking at idle speed, it is recommended that you go to the 4S shop to check whether the oil supply pressure and intake pressure sensors are normal. If the oil pump oil supply pressure is abnormal or the intake pressure sensor value is wrong, it will not work normally and the body will shake.

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 shock-proof system of the engine, which is responsible for absorbing the 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.