Pu Sang startup problem

Now most cars use EFI engines, and there are several reasons why the cold start is not good:

1. The water temperature sensor signal is inaccurate. When the vehicle is cold-started, it needs a rich mixture to start easily. The water temperature sensor is the main signal to adjust the fuel injection quantity, and the computer can increase or decrease the fuel injection quantity according to the temperature signal provided by it. If the signal is not accurate, the computer can't identify the cold start state, and the fuel injection quantity does not increase, resulting in poor cold start.

2. There is too much carbon in the intake valve and combustion chamber of the engine. These carbon deposits will absorb fuel like sponge water, and this vicious cycle will make more and more carbon deposits. Because a large amount of fuel mixture is absorbed by carbon deposits, coupled with poor atomization during cold start, poor cold start will occur.

3. The throttle body is too dirty. The basic throttle opening exceeds the adaptive limit of the computer and the valve body, which makes it difficult for the computer to judge the starting conditions and increase the fuel injection accordingly. There is no high idle speed when the automobile is cold, which makes it difficult to start the automobile cold.

4. The spark plug is not working properly. If the spark plug is not replaced for a long time, the electrode gap will gradually increase, thus weakening the ignition energy. When the cold start mixture is poorly atomized, there will be a bad cold start phenomenon.

5. The battery capacity is insufficient. Therefore, the speed of the starter can't reach the speed of the engine, making it difficult to start.

6. When the starter starts, the resistance is large and the speed is slow.

7. The engine oil viscosity is too high, especially when the cold temperature is low, the internal resistance of the engine is large, which makes it difficult to start the engine cold.