What causes backfiring and poor acceleration when cold but normal operation when warm?

[OKylie]

The reasons for backfiring and poor acceleration when cold but normal operation when warm are as follows: 1. Carbon deposits in the throttle body and combustion chamber. During cold starts, the fuel injection duration is extended. Due to carbon deposits, some gasoline is absorbed by the deposits, leading to temporary unstable ignition. Additionally, incomplete combustion causes flammable gas mixtures to ignite in the exhaust pipe, resulting in backfiring. 2. When the engine warms up, the gasoline absorbed by the carbon deposits evaporates, stabilizing the engine. This explains why such issues do not occur when the engine is warm. 3. Causes and prevention of carbon deposits: (1) Prolonged idling can easily lead to the formation of carbon deposits in the car. (2) Regularly performing necessary cleaning of the car's intake system is the most effective way to reduce carbon deposit formation. Therefore, owners can perform necessary cleaning of the car's intake system at around 30,000 kilometers.