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Why is the engine still making noise after turning off?

1 Answers

LaStephen

07/29/25 10:45am

Here are the reasons why the engine may still make noise after the car is turned off: 1. Cooling sound of the catalytic converter: The normal operating temperature of the 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 due to heat, resulting in abnormal noises. 2. Turbo cooling sound: Normally, the exhaust gas temperature reaches 600-700°C, accelerating the friction-generated heat from the rapidly rotating turbo. After turning off the engine, the thermal expansion and contraction are quite noticeable, leading to abnormal noises. 3. Uneven engine cooling: After driving for a while, the engine temperature is very high. When turned off, the temperature of various components drops, and the thermal expansion and contraction cannot occur uniformly, inevitably causing friction between internal metal parts due to cooling contraction, resulting in abnormal noises. 4. Cooling fan operation: The fan will automatically shut off once the water temperature drops, so there's no need to worry. If the cooling fan is still running, it means the engine temperature is still too high, and the fan will continue to operate for one to two minutes.

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