1, the engine has a serious carbon deposit, and the most common reason for car 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 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 when the gasoline adsorbed by carbon deposits reaches saturation can it easily enter the car, 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, which will make the mixture rich and the combustible mixture of the engine diluted and concentrated, resulting in idling jitter after cold start.
2, ignition system problems, check the working conditions of spark plugs, high-voltage lines and ignition coils. Poor working conditions of ignition systems and spark plugs can also lead to such failures;
3. The oil pressure is unstable. For example, the engine carbon deposit has been cleaned, the throttle valve has been cleaned, and the spark plug has been replaced. , the body is still shaking at idle speed. It is recommended to check whether the oil supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal, or the intake pressure sensor has an incorrect value or works poorly, the body will shake.
4. The aging of engine parts and automobile jitter are also related to the aging of engine feet. The engine foot is 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 idling jitter.
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