What is the reason why the cold car began to purr?

It may be that there is too much carbon in the throttle and idle valve of the car, which leads to poor air intake, so there is abnormal noise when starting. Cold start refers to starting a car when the engine water temperature is low, which is generally used for cars that have not been started for a long time. Before the vehicle starts, it is necessary to check whether there is electrolyte leakage in the battery case. If there is leakage, the battery should be replaced in time. If there is no leakage, use hot water to clean the oxide on the battery surface and the pole to prevent water from entering the battery from the vent pipe. When the engine temperature is normal, the engine can be successfully started several times, indicating that the battery is in good condition. If the engine speed drops gradually every time, it means that the battery voltage is out of power and needs to be recharged in time. Pay attention to the detection and maintenance of batteries. Million car purchase subsidy