Da465 EFI car is not easy to start.

1. The water temperature sensor signal is inaccurate. When the vehicle starts, it needs the right 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 its signal is not accurate, the computer will not be able to identify the startup state, resulting in poor startup.

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 opening of throttle valve exceeds the adaptive limit of computer and valve body, which makes the computer unable to judge the starting conditions and adjust the fuel injection quantity accordingly, thus causing the phenomenon of difficult starting.

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 starting mixture is poorly atomized, the phenomenon of poor starting will occur.

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 and it is difficult to start the engine.