What is the cause of the car idling jitter during cold start?
Some car owners leave their cars at home for a long time to save money. However, the car may be difficult when it is cold started because it has not been started for a long time, and even it will idle when it is cold started. Many car owners will think that the car is broken, but it is not. So what is the cause of idling jitter when the car is cold started, and how to solve this problem? Next, let me explain it to you.
1, engine carbon deposit
Many drivers are unwilling to step on the accelerator in order to save fuel, so long-term bad driving habits will lead to carbon deposition in the engine. There are also factors such as poor quality of automobile gasoline and aging of engine carburetor, which will lead to carbon deposition in the engine. When the engine has too much carbon deposit, it will lead to idle jitter during cold start. Therefore, it is necessary to clean the carbon deposit in the engine regularly, disassemble and clean the throttle regularly, and keep the engine clean.
2, the engine temperature is low
When the car is cold started, the temperature of the engine is similar to that of the surrounding environment. At this time, the low temperature of the engine will lead to the reduction of ignition energy, which will eventually affect the engine power. When the car starts cold, the idle speed will shake, especially in winter. So you must park your car in the garage in winter, and you can start the car in the garage. The environment in the garage is warmer than the outside, which can alleviate the engine jitter to some extent.
3, water temperature sensor failure
The water temperature sensor is an important part of the computer to judge the working condition of the engine, but when the water temperature sensor fails. Obviously you are driving a cold car, but the sensor will show that it is a hot car. This means that when the car is cold-started, the engine temperature is minus 10 degrees Celsius, but the computer receives the engine temperature of 20 degrees Celsius, so the oil quantity will become smaller, and the car will naturally have idle jitter when it is cold-started. At this time, it is necessary to check what is wrong with the water temperature sensor and replace it in time.
4. The working conditions of each cylinder are different.
The spark plug of multi-cylinder machine has been used for a long time, and the ignition gap will be different. At this time, the power generated by some cylinders will be small, and the car will have idle jitter during cold start. At this time, we need to replace the spark plug. In addition, when the engine is used for a long time, the clearance between each cylinder liner and piston will be different, and the power output will be reduced when the car is cold started, which will naturally produce idle jitter.
5, oil and gas mixing ratio is not allowed
Many vehicles have inaccurate oil-gas mixing ratio. At this time, when we start the car, there will be errors in the control of ignition time, the power output of the car will be reduced, and the car will naturally appear idle jitter.
In addition to the above reasons, there are many other factors that lead to idle jitter when the car is cold started. When the car is idling during cold start, we need to find out the reason and then prescribe the right medicine to solve the problem fundamentally.