The idle speed of the car is unstable after cleaning the throttle.

Because the throttle opening has not been reset. Due to the long-term carbon deposition on the throttle, the carbon deposition squeezes the throttle, and the throttle opening also expands. When we clean the throttle, if it is not reset, the throttle opening will remain in the state before carbon deposition, which will lead to an increase in air intake and unstable idle speed in severe cases. Cause of unstable idle speed after cleaning the throttle: 1. Excessive carbon deposition If the carbon deposition in the engine cylinder is serious, it will cause spark plug blockage and valve blockage, which will directly affect the trembling and vibration of the car when idling. If the acceleration ability of the car is not as good as before, and the shaking and shaking are very lasting, then you can consider cleaning the engine cylinder; 2. Oil supply system failure. Unstable oil pressure will easily lead to unstable mixture concentration, which will not only cause shaking and vibration, but also cause unstable idle speed. The first task is to consider replacing the gasoline filter. After all, the filter element may be blocked after a long time. If the oil pressure that does not pass through the gasoline filter is detected, there may be something wrong with the oil pump.