As the weather gets colder, many customers feel that it is difficult to start the car when it is cold. They have to start the car several times and the idle speed is unstable between (700-1200r / min) after starting. The acceleration is weak.

那么~这种情况是什么原因造成的呢？

So what is the cause of this situation?

将车辆放置冷却状态，链接专用电脑读取故障码及平稳值。进一步排查

Put the vehicle in the cooling state, link the special computer to read the fault code and stable value. Further investigation

油  汽  火。

Oil vapor fire.

拆卸火花塞及点火线圈查看后无异常，由于无缺火及单独缸混合气异常，说明喷油嘴无异常，用专业仪表测得 燃油低压压力为0.5Mpa,与标准值误差不大，空气流量为13.5kg/h 为正常，读取节气门开度时发现故障出现时开度忽大忽小，可见是由于配气造成得，再凉车启动时发动机电脑会使混合气比较浓，但不应忽大忽小。此可见 要么是在近气过程中漏气，要么是进气管或气门有积碳影响进气效果。

After the spark plug and ignition coil are removed, there is no abnormality. Because there is no misfire and the mixture of individual cylinder is abnormal, it indicates that the fuel injection nozzle is normal. The low-pressure fuel pressure measured by professional instrument is 0.5MPa, The error with the standard value is not big. The air flow is 13.5kg/h, which is normal. When reading the throttle opening, it is found that the throttle opening changes from big to small when the fault occurs. It can be seen that it is caused by valve distribution. When the car is cooled again, the engine computer will make the mixture rich, but it should not change from big to small. It can be seen that either there is air leakage in the near air process, or there is carbon deposition in the intake pipe or valve, which affects the intake effect.

查看节气门发现机碳不算特别严重，清洗后装回，故障依旧。拆卸进气管查看管道及气门，发现气门积碳严重，使用清洗剂将气门及管道清理干净后，恢复并删除发动机调效值，试车怠速不稳得问题已经解决，但加速仍稍微不足，师傅判断应是进气管道内得机油积碳卡滞引起进气歧管上DISA阀损坏，经拆卸  阀1无法正常工作  阀2 无法完全打开。更换试车后故障排除。

Check the throttle and find that the engine carbon is not particularly serious. After cleaning, install it back and the fault is still there. Remove the intake pipe and check the pipe and valve. It is found that there is serious carbon deposition on the valve. After cleaning the valve and pipe with cleaning agent, restore and delete the engine efficiency adjustment value. The problem of unstable idle speed in the test has been solved, but the acceleration is still a little insufficient. The master judges that it is the oil carbon deposition in the intake pipe that causes the disa valve on the intake manifold to be damaged, and valve 1 can not work normally after removal Valve 2 does not fully open. Troubleshooting after replacement test run.