Why Does a New Car Make Abnormal Noises When Starting?
3 Answers
Reasons for abnormal noises when a car starts: Engine temperature too low: During a cold start, the engine temperature is too low for normal operation. Thermal expansion of the catalytic converter: If abnormal noises occur when the car first starts but disappear after a while, this is caused by the thermal expansion of the catalytic converter and is a normal phenomenon. Transmission malfunction: One of the reasons for abnormal noises when starting a car includes transmission failure, which causes internal gear friction and results in abnormal sounds. Worn engine belt or chain: If the engine belt or chain is worn, it can cause friction or abnormal noises due to idling when the vehicle starts.
When I first got my new car, I often heard a slight clicking sound during startup, especially on winter mornings. I later found out this is quite common, as many fellow car owners have shared similar experiences. The usual cause is cold starts leading to the engine belt needing a break-in period; some factory-installed components may not be fully settled, such as belts or fan motors operating unstably in low temperatures, causing friction noises. Additionally, uneven fuel injection during initial startups can also produce brief noises. I recommend letting the car warm up for a while before driving and avoiding aggressive throttle inputs right away. If the sound persists beyond a few weeks or intensifies, definitely visit the dealership for a free inspection—new car warranties make this easy to address. Also, try driving longer distances within the first 500 km to help the car adapt; unusual noises will likely disappear.
As someone quite fascinated by cars, I've observed that startup noises in new vehicles often stem from system optimization. For instance, turbocharged engines may squeal during cold starts due to airflow issues; the metallic components of the exhaust system expanding and contracting with heat can also produce normal clicking sounds. I once tested this, and minor noises showed significant improvement after a 1,000-kilometer break-in period—it's not a malfunction. I recommend that car owners inquire more with technicians during maintenance to learn to distinguish sounds: brief clicks are okay, whereas continuous roars warrant attention. New car designs prioritize efficiency, so some minor noises are to be expected.
