How to improve the idle speed when the idle speed of the car is low?

Adjustment method of low idle speed of automobile engine: 1. First, adjust the throttle screw of the carburetor clockwise and counterclockwise. Adjust the engine speed slightly higher than the normal idle speed, and then turn the idle oil concentration adjustment screw (copper screw with prefix on the left side of carburetor, clockwise downward and counterclockwise upward). ), find out the highest speed of the engine at the throttle position; 2. Adjust the throttle screw slightly counterclockwise to reduce the engine speed; Then adjust the idle oil concentration adjustment screw to find a higher engine speed. This is repeated several times according to the mode of "throttle down+idle oil up" until the maximum speed of the throttle valve is equal to the standard idle speed of the whole vehicle when it is adjusted to a certain position; 3. Generally, the idle speed is adjusted to 1200 rpm, that is, listening to the exhaust sound is ten times that ordinary people can barely hear every second. Sometimes, after the best adjustment, the concentration of CO is still high. At this time, Paris adjustment method or lean oil adjustment method can be adopted appropriately.