Why does the Magotan make abnormal noise for a few seconds during cold start and then disappear?
2 Answers
The reasons for the Magotan making abnormal noise for a few seconds during cold start and then disappearing are as follows: Incomplete lubrication of the car: When the car is cold, due to gravity, all the engine oil is in the oil pan and has not yet fully lubricated all parts of the engine. At this time, when starting the engine, there is no oil film between the components, especially in areas such as the cylinder head and valves. Without lubrication, abnormal noise will occur. Generally, after the car warms up, the components get lubricated, and the noise will disappear. Other reasons: Abnormal noise caused by valve tapping; abnormal noise caused by the generator belt being too tight; abnormal noise caused by the generator belt slipping; abnormal noise caused by the timing chain loosening, etc. It could also be that the belt hardens when the car is cold. You can try pouring some water on the belt to see if the noise disappears. If it does, it is because of the belt.
A squealing noise during cold start that disappears after a few seconds is mostly caused by engine components, such as a loose or aged belt creating friction when cold, which quiets down once the oil warms up and lubricates. It could also be due to insufficient oil pressure in the valve lifters—when the engine is cold, oil hasn't circulated yet, but it normalizes after a few seconds. If the noise is brief and doesn't affect driving, you can first check if the belt is cracked yourself. However, it's best to visit a 4S shop to have a mechanic inspect the timing chain or tensioner to prevent minor issues from worsening. I've driven a similar car before, and replacing the belt or changing the oil improved the situation significantly. Regular maintenance can prevent such problems proactively.
