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What Causes the Chassis Noise After Parking?

1 Answers

AnaMarie

07/29/25 8:03pm

Here are the specific reasons for chassis noise after parking: 1. Cooling sound of the three-way catalytic converter: The normal operating temperature of the three-way catalytic converter is 400-800°C. After turning off the engine, its operation gradually stops, and the temperature drops, causing the internal metal components to expand and contract with heat, resulting in noise. 2. Cooling sound of the exhaust pipe: Generally, the exhaust pipe reaches over 200°C during cold idle. When the vehicle is under high load or there is combustion of mixed gases in the exhaust pipe, the temperature can be even higher. Therefore, the exhaust pipe also expands and contracts with heat, producing noise, which typically comes from the front end of the exhaust pipe and the flexible connection. 3. Cooling sound of the turbocharger: Normally, the exhaust gas temperature reaches 600-700°C, accelerating the friction-generated heat from the turbocharger's rapid rotation. After turning off the engine, the heat expansion and contraction are quite noticeable, leading to noise. 4. Noise caused by uneven engine cooling: After driving for a while, the engine temperature becomes very high. After turning off the engine, the temperature of various components drops, and the heat expansion and contraction cannot occur uniformly, causing gaps between internal metal components to contract due to cooling, resulting in friction and noise.

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