What is the reason for the engine jitter of cold car?

1, the internal temperature of the engine is not enough: when the cold car is started, the internal temperature of the engine is similar to the surrounding environment. The temperature at this time is not suitable for engine operation. In the low temperature environment, poor fuel atomization leads to the reduction of ignition energy, which affects the power performance and makes the car shake. This phenomenon will happen more often in winter, so you can park your car in the garage in winter, which can alleviate the engine jitter.

2. Incorrect oil-gas mixing ratio: When the car is cold-started, the viscosity of engine oil is high, and all parts can not be fully lubricated, which is prone to inaccurate mixing ratio of source oil and gas, misjudgment by the car computer, reducing the power output of the car, and leading to the phenomenon of car jitter.

3. Car carbon deposit: Car carbon deposit is one of the important reasons for car cold start jitter. In the daily driving process, due to the different driving environment and driver's driving habits, carbon deposition will occur in different degrees, and too much carbon deposition in the valve and intake pipe will make it difficult to start a cold car.