The cheetah black king kong cold car is idling unsteadily and emitting black smoke.

The solutions to unstable idle speed, jitter, shaking and black smoke are as follows: 1. The engine has a serious carbon deposit, and the common reasons for car jitter are that the throttle valve is too dirty or the nozzle has too much carbon deposit. Solution: clean the oil circuit, check whether the idle motor has carbon deposit and clean it; 2. Ignition system problems, check the working conditions of spark plugs, high-voltage lines and ignition coils. The ignition system is not easy to use, the spark plug is not easy to use, and it is also dangling, and the exhaust pipe emits black smoke. Solution: check whether there is too much carbon deposit in the spark plug and replace the spark plug; 3. The oil pressure is unstable. If the engine carbon deposit has been removed, the throttle valve has been cleaned, the oil pad and spark plug have been replaced, and the body is still shaking at idle speed, it is recommended to go to the 4S shop to check whether the fuel supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal or the value of the intake pressure sensor is incorrect and works poorly, it will basically cause the body to shake. Solution: Check the oil pressure and replace parts if necessary; 4. The aging of engine parts, the shaking and vibration of cars are also related to the aging of engine feet (also called claw pads). I think the engine foot is the damping system of the engine. The engine feet are responsible for absorbing slight shaking and vibration when the engine rotates. If there is something wrong with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing shaking and vibration at idle speed. Solution: Replace parts.