What Causes the Abnormal Noise When a Car Just Starts?

[MacJaxson]

Abnormal noise after starting the car is most likely due to engine belt failure or loose engine mount bolts causing engine vibration and a buzzing sound. Here are the specific details: 1. If the engine mount bolts are loose, you can find and tighten the screws yourself. If it's an engine belt issue, first check the belt's tension. You can try pinching the drive belt with your fingers and then twisting it. Note that this operation should be performed when the engine is cool, and the twist angle should generally be less than 90 degrees; otherwise, adjustment is needed. 2. Sometimes, if the car belt is loose, it may produce a buzzing sound. You should take the car to a repair shop to check the belt and tighten it appropriately to see the effect. Regular belt maintenance is essential, and the tension should be moderate.