How to adjust the idle speed of freight cars? What problems should we pay attention to?

Adjustment method of engine idle speed: When the engine idle speed is unstable, it should be adjusted when the engine temperature is normal and the oil circuit is trouble-free. Use a screwdriver (commonly known as screwdriver, screwdriver) to slowly loosen the throttle opening adjustment screw, and when the engine is about to turn off, screw it in a little more to maintain the engine running. Adjust the idle air mixture adjusting screw. Let the engine run faster. (3) Turn out the valve opening adjustment again, so as to achieve stable idle work and accelerate without flameout.