What are the reasons for abnormal noise after the Lamando is turned off?
1 Answers
There are three main reasons for abnormal noise after the Lamando is turned off. Below is a detailed introduction to these three reasons: 1. Uneven engine cooling: After the car has been driven for a period of time, the engine temperature is very high. After turning off the engine, the temperature of various components decreases, and thermal expansion and contraction cannot occur at a completely uniform rate. This inevitably leads to gaps between the internal metal components of the engine, causing friction and abnormal noise due to cooling contraction. 2. Cooling noise from the exhaust pipe: Generally, the temperature of the exhaust pipe during cold idle is around 200°C. When the car is under high load or when there is combustion of the air-fuel mixture in the exhaust pipe, the temperature will be even higher. Therefore, the exhaust pipe will also produce abnormal noise due to thermal expansion and contraction. 3. Cooling noise from the three-way catalytic converter: The normal operating temperature of the three-way catalytic converter is between 400-800°C. After turning off the engine, its operation gradually stops, and the temperature decreases. The internal metal components will then undergo thermal expansion and contraction, resulting in abnormal noise.
