What are the causes of abnormal noise during cold start of a car engine?

1 Answers
LeHaven
07/24/25 4:36am
The main reasons for abnormal noise during cold start are the following three points: 1. Poor combustion: If the power provided by the car is insufficient, the car will emit abnormal noise. 2. Low ignition energy leading to abnormal noise: The first problem a car faces during a cold start is the low temperature. The temperature inside the engine is not high enough, and the temperatures of both fuel and lubricating oil are insufficient. Therefore, more fuel should be injected during a cold start to meet the power requirements. 3. Poor fuel atomization at low temperatures: Fuel requires higher ignition energy. After prolonged use of the car, the ignition gap of the spark plug increases, leading to a decrease in ignition energy, which affects the power performance and causes the car to emit abnormal noise.
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