How to adjust the idle speed of the car?

1, the idle speed can be lowered in summer, about 1000 rpm. 2. Winter 1500 rpm is enough, but the EFI engine cannot adjust its idle speed by itself. How to adjust the idle speed of the car: 1. After the throttle is completely relaxed, leave a certain free clearance, install the air filter, make sure that other components are in good condition, start the engine, let it warm up first, and open the choke valve first. 2. Start the adjustment first. First, screw the air conditioning screw to the end, and then turn it. Second, adjust the throttle screw to ensure that the engine can run at a certain speed after the throttle knob is completely loosened. 3. First, reduce the idle speed as much as possible to reduce the engine speed as much as possible. 4. Try to increase the idle speed again, and at the same time adjust the air conditioning screw to make the engine speed as high as possible. 5. Repeat the steps like this. Satisfactory idle speed can be found after repeated adjustment.