I believe that many car owners have had such experience when they parked, that is, there were some abnormal sounds after the car was stopped and stopped. This will inevitably make us wonder because in our mindset we all think that the car has stopped and why it makes a noise. In fact, the reason is very simple, that is, although the car is stopped, but the various parts of the car and electronic equipment are still running, so it will happen abnormal sound. In this regard, Xiao Bian has summarized some of the reasons for abnormal sounding after the car is turned off under normal conditions?

Cooling sound of catalytic converter

Since the normal operating temperature of the three-way catalytic converter is 400-800°C, the work of the three-way catalytic converter will gradually stop after the vehicle is turned off, and the corresponding temperature will gradually decrease. At this time, due to the principle of thermal expansion and contraction, the metal parts in the interior of the car caused abnormal noises.

Cooling sound of exhaust pipe

Generally, the temperature of the exhaust pipe can reach more than 200 when the cold car is idling. The temperature of the car will certainly be higher if the load is high or the mixture gas is burned in the exhaust pipe. Therefore, the exhaust pipe also suffers from thermal expansion and contraction and abnormal sound, and this sound is often caused at the front end of the exhaust pipe and at the soft joint.

Turbo cooling sound

Under normal circumstances, the temperature of the exhaust gas produced by the automobile is as high as 6,700° C., and the temperature at which the turbo is accelerated by the rapid rotation friction, and the phenomenon of thermal expansion and contraction after the vehicle is extinguished is even more pronounced, thereby giving rise to abnormal noise.

Unusual noise caused by uneven engine cooling

Since the temperature of the engine will be very high after the car is driven for a period of time, and the speed of the temperature drop of each component cannot be completely a ratio after the car is turned off, the gap between the various metal components inside the engine will inevitably cause friction due to cooling shrinkage. ring.

It is inevitable that car owners will worry about abnormal noise. However, through the above summary, it is hoped that they can help some car owners. Although abnormal noise may occur after the car is turned off, it may be a problem. However, such a situation is after all a minority.

Manufacture Front Air Suspension Shock Absorbers 7L6616039D 7L6616040D Airmatic Air Strut Shocks For Q7 2002-2010

Specification

Description: Manufacture Front Air Suspension Shock Absorbers 7L6616039D 7L6616040D Airmatic Air Strut Shocks For Q7 2002-2010

Model: For Q7 Air Suspension Shock Absorbers 7L6616039D 7L6616040D 2002-2010

Position: Front left and right

OEM: 7L6616039D 7L6616040D

Condition: Original rebuild

Material: Rubber Steel Aluminum

Application:For Q7 2002-2010 7L6616039D 7L6616040D

Warranty: 12 months

Delivery: 3-7 days after receiving payment

Gross Weight: 12KG

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