点火时间过迟，气缸内的压力就会降低，混合气燃烧也就迟缓。当进气门打开时，有尚不完全燃烧的气体冲回进气道，从而引起进气道放炮。这种现象和混合气过稀引起的进气道回火放炮相似之处。诊断时，可利用加速泵改善混合气浓度，如放炮现象消除即可混合气过稀所致；如放炮现象仍不能消除，将可能为点火时间过迟所致，可转动配电器，是点火时间提前，故障即可排除。
If the ignition time is too late, the pressure in the cylinder will be reduced and the combustion of the mixture will be sluggish. When the intake valve is opened, the incomplete combustion gas flushes back to the inlet port, which causes the inlet to shoot. This phenomenon is similar to the flashback shooting of inlet caused by too thin mixture. In diagnosis, the acceleration pump can be used to improve the mixture concentration. If the shooting phenomenon is eliminated, the mixture will be too thin; if the shooting phenomenon still can not be eliminated, it may be caused by too late ignition time. If the distributor can be turned, the fault can be eliminated if the ignition time is advanced.
定期做平衡检查。定期检测平衡不但能延长轮胎寿命，还能提高汽车行驶时的稳定性。
Check the balance regularly. Regular detection of the balance can not only prolong the tire life, but also improve the stability of the car when driving.
不同规格的轮胎不能混装子午线轮胎和斜交轮胎的侧向力不同。如果将两种不同的轮胎同时装在同一轴上，就会造成转向过度或不足，或容易造成侧滑。
Radial tire and bias tire have different lateral force. If two different tires are installed on the same axle at the same time, it will cause oversteer or understeer, or easy to cause sideslip.
适时更换。 建议轮胎的使用寿命是4万公里左右，如果路面状况非常好的行驶环境，可以延长到6万公里，如果行驶里程较少，但使用时间超过两年同样建议更换。
Timely replacement. It is suggested that the service life of the tire is about 40000 km. If the road condition is very good, it can be extended to 60000 km. If the driving mileage is small but the service life is more than two years, it is also recommended to replace the tire.
