What Causes Abnormal Noises When Starting a Car?
2 Answers
Here are the specific reasons for abnormal noises when starting a car: 1. Carbon brush failure: The abnormal noise after starting the car may be caused by a faulty carbon brush inside the starter motor, which requires inspection and repair at a professional auto repair shop. 2. Belt aging and slipping: Due to prolonged operation, the belts inside the engine may age and slip, causing abnormal noises after starting the vehicle. This requires maintenance and care of the belts at a professional auto repair shop. 3. Loose engine mount bolts: Loose engine mount bolts result in improper installation of the engine support, necessitating inspection, care, and repair at a professional auto repair shop.
As a seasoned driver with decades of experience, I've encountered abnormal noises during startup multiple times. The most common causes include worn starter motor gears, which produce a clicking friction sound when rotating, especially in older vehicles. Aging or loose belts in the system, such as the alternator belt, can also lead to squealing noises, particularly noticeable during cold starts in summer. If the flywheel ring gear is rusted or damaged, it may create a rattling impact sound. I recommend starting with simple checks, such as inspecting whether battery terminals are loose or if the battery has sufficient charge, as low voltage can trigger other abnormal noises. Regular maintenance of these components is crucial, and timely replacement of worn belts or motors can prevent the danger of breaking down at high speeds. Remember, strange noises are small warning signs—ignoring them could double your repair costs.
