It is difficult to start the Jetta cold car. After testing, the electric starting system is normal. After cleaning the throttle and replacing the spark plug, it still hasn't been solved. On the contra

It is difficult to start the Jetta cold car. After testing, the electric starting system is normal. After cleaning the throttle and replacing the spark plug, it still hasn't been solved. On the contrary, it is difficult to start a hot car. Use a computer to check the fuel injection quantity of the injector. If the fuel injection quantity of the fuel injectors is different, it is difficult to start. You said the idle speed was unstable, so it's time to change it. Do you see the fuel circuit? If the gasoline partition is blocked, or the oil pump filter is too dirty, the same is true! Then look at the timing and see if the temperature is right! Try a new high-voltage cable and high-voltage package.