The big dipper is not cold enough to start. Where should I check it?

First of all, you should check whether there is too much carbon in the throttle, and also check whether there is too much carbon in the air intake and combustion chamber. Due to too much carbon and dirt deposited in the throttle and air intake, the cross-sectional area of the air passage changes, which makes the control unit unable to accurately control the idle intake air volume, resulting in the mixture being too rich or too lean and the engine unable to start. It is also possible that the fuel constant pressure performance of the electronic control system is poor and the fuel pressure is low, which leads to poor atomization of fuel injection at low temperature and difficult starting. It is suggested that you can turn the key to the fully open position of the instrument light when starting, and wait for a while, or the engine can complete the self-test procedure, which is also beneficial to the whole engine and other electrical equipment. At this time, you can hear the noise of the oil pump. When the sound is over, close the key door and repeat the above operation two or three times. Then you should be able to hit it again.