Clear the throttle

Several reasons of unstable idle speed when cold car starts;

1, caused by dirty throttle;

2, caused by oxygen sensor failure;

3, water temperature sensor failure;

4. The spark plug is caused by excessive carbon deposition;

Solution:

1, clean the throttle;

2. Detect the fault code with a special automobile computer;

3. Replace the spark plug;

The above steps basically solved the problem of unstable idle speed when the cold car started.