Zhengzhou Nissan zd22TE can start. What's the matter with no idle speed?

The reason is: 1, the spark plug has not been maintained for a long time, and there is too much dirt on the surface, and it has not been replaced for 30 thousand kilometers.

2. The fuel injector and throttle valve are not cleaned and maintained.

3. There is too much sludge in the engine, or too much carbon deposit when driving at low speed for a long time, and the oil and machine filter are not replaced in time.

4. The poor oil circuit may also cause unstable idle speed, and these problems will also occur when the famous brand gas station refuels for a long time or changes the gasoline filter irregularly.