14 Volkswagen Bora has low idle speed in winter.

1. The reasons for the low idle speed of the cold car start are: carbon deposition on the throttle, unclean air intake, and weak sparks caused by individual spark plug failures, so the spark plugs should be cleaned or replaced in time. Too low engine idle speed is easy to cause the vehicle to stall, which will seriously lead to the fire and stall of the exhaust pipe, especially in winter.

2. If the car is used for a long time, the air inlet will be blocked, and there will be carbon or engine oil on the throttle, which will cause the phenomenon of unstable idle speed or even low idle speed. The throttle will affect the air intake due to carbon deposition, and the idle speed will be low when the car starts. It is suggested that the owner clean the throttle and air intake of the car to avoid abnormal idle speed.

3. With the extension of service time, there will be carbon deposition in automobile spark plugs. When the carbon deposition is serious, the spark plug on individual cylinders will be weak, which will affect the performance of the vehicle and lead to the phenomenon of low idle speed of the vehicle. It is recommended to clean or replace the spark plug in time.

4. When the fuel nozzle of the automobile is blocked, there will be poor fuel supply pressure and fuel atomization in the automobile, which will lead to unstable or low idle speed of the automobile. When the intake pipe of a car fails, the proportion of mixed gas is unbalanced, which may lead to excessive emissions and unqualified annual inspection of the car.