Why does the car keep making noise after being turned off?
1 Answers
If the car keeps making noise after being turned off, it may be due to the cooling sounds of the catalytic converter, exhaust pipe, etc. Here is more relevant information: 1. Turbo cooling sound: Under normal circumstances, the exhaust gas temperature can reach 600-700°C, accelerating the friction-generated heat from the rapidly spinning turbo. After turning off the engine, the thermal expansion and contraction can be very noticeable, resulting in abnormal noises. 2. Abnormal noise caused by uneven engine cooling: After driving for a while, the engine temperature is very high. When turned off, the temperature of various components drops, and thermal expansion and contraction may not occur uniformly, inevitably leading to friction between internal metal parts due to cooling contraction, causing abnormal noises. 3. Poor operation of the starter solenoid: The solenoid is used to engage the starter gear with the engine flywheel. After turning off the engine, the solenoid should disengage. If it malfunctions, it can easily produce a "rattling" noise.