What Causes the Squeaking Noise When Starting the Car?

[DiKeegan]

There are several reasons for the squeaking noise when starting the car: 1. If the car has not been used for a while, the engine oil will flow back to the oil pan, resulting in insufficient oil in the top part of the engine, such as the valve chamber. Since the valves lack the sealing and lubrication from the oil, a hissing sound can be heard from the bottom of the car when starting it. This situation is normal. 2. A continuous hissing sound after starting the car is most likely due to an issue with the engine belt. First, check the tightness of the engine belt. You can try pinching the belt with your fingers and twisting it. Note that this operation should be performed when the engine is cool. The twisting angle should generally be less than 90 degrees; otherwise, an adjustment is needed. 3. The noise from the engine belt can also be caused by dirt accumulation. Cleaning it with water or applying some lubricant can eliminate the noise.