Why is Chery QQ Dongan 465 difficult to start?

The main reasons for the difficulty in starting are: 1, carbon deposition in the intake system, which reduces the cross-sectional area of the air passage and the amount of idle auxiliary air. This situation is generally different from that used before. Mainly reflected in: a, the engine speed is too high after the cold car starts, which is 300 ~ 400 rpm higher than the normal warm-up speed. B, when braking or slowing down, the engine speed pointer fluctuates. C. When starting the engine, according to the comparison with the previous starting phenomenon, it can be clearly seen from the starting sound that the engine speed at this time is very fast and easy. 2. The starting voltage of the battery is too low. Ecm determines the state of the starting signal according to the engine speed signal and the battery voltage signal. When the starting voltage of the battery is lower than 10v, ecm will make it difficult or impossible to start according to the input signals of various sensors in some cases. Mainly reflected in: when the first ignition, pay attention to observe whether the engine tachometer pointer is proportional to the rotation of the starter.