With the weather getting cold gradually ~ many customers think it's difficult to start a cold car. They need to repeat it several times and the idle speed is unstable (700-1200r / min) after the start. Weak acceleration.
So ~ what is the cause of this situation?
Put the vehicle in the cooling state, link the special computer to read the fault code and stable value. Further investigation
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***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。至此可见 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 removing the spark plug and ignition coil, there is no abnormality. Because there is no misfire and the mixture of single cylinder is abnormal, it means that there is no abnormality in the fuel injection nozzle. The fuel low pressure measured by the * * * instrument is 0.5MPa, The error between the standard value and the standard value is not large. The air flow is 13.5kg/h, which is normal. When reading the throttle opening, it is found that the opening is not large or small when the fault occurs. It can be seen that it is caused by the gas distribution. When the engine is started in cold condition, the computer will make the mixture thicker, but it should not be large or small. So far, it can be seen that either air leaks in the process of near air, or carbon deposits in the intake pipe or valve affect 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 carbon is not very serious. After cleaning, replace it, and the fault is still the same. Dismantle the intake pipe to check the pipes and valves. It is found that the carbon deposits on the valves are serious. After cleaning the valves and pipes with cleaning agent, restore and delete the engine regulation value. The problem of unstable idle speed in the test run has been solved, but the acceleration is still a little insufficient. The master judges that it is the carbon deposits in the oil in the intake pipe that cause the disa valve on the intake manifold to be damaged. The valve 1 can not work normally after disassembly Valve 2 does not fully open. Troubleshooting after replacement test run.
那么 重点来了~~空气滤芯长时间不更换,长时间不清洗节气门,汽油燃烧不良 ,烧机油点火系统不好及燃油品质,等等.........一系列原因都会引起积碳的产生哦.
So the point is coming ~ ~ the air filter element will not be replaced for a long time, the throttle will not be cleaned for a long time, the gasoline will not burn well, the engine oil ignition system will not burn well and the fuel quality, etc.... A series of reasons will cause carbon deposition