What Causes Car Noises?

[AngelinaMarie]

Car noises may originate from engine noise and tire noise. Below are the specific causes of car noises: Engine Noise: Engine abnormal noises can be categorized into cold engine noise and hot engine noise. Cold engine noise refers to abnormal sounds coming from the engine compartment when starting the car, which disappear after the engine warms up. This type of noise is likely due to the car being parked for an extended period, causing the lubricating oil to mostly flow back into the oil pan. During a cold start, the oil pump cannot immediately establish oil pressure, leading to valve clearance in either hydraulic lifters or mechanical rocker arms, or the timing chain not functioning properly due to insufficient oil pressure, resulting in a ticking sound. Tire Noise: Tire noise is generally caused by air noise generated by the airflow in the gaps between tire treads. Since tires are rubber products, they tend to harden and age over time, naturally producing noise. New tires have good elasticity, offering better performance in terms of both noise and comfort. If the tire noise is too loud, check if the tires have aged and consider replacing them if necessary.

[LaAmara]

Having driven for nearly twenty years, I'm quite familiar with the sounds from the engine bay. Common noises in older cars are usually limited to a few types: the rhythmic tapping of pebbles stuck in tire treads, the squealing of rusted or worn brake discs when braking, the annoying high-pitched whistle of a loose slipping belt, and the distinct thud over speed bumps due to worn suspension bushings. My advice is to first roll down the windows and carefully listen for the source of the noise—whether it's from the front wheels, rear wheels, or underneath the car. Steering wheel vibrations often indicate tire balance issues, while a clunking sound when turning the wheel while stationary usually points to a faulty wheel bearing. Parking in a way that avoids water immersion can also help protect the undercarriage from rust. These tips are sure to be helpful for fellow owners of older vehicles.

[AmirDella]

In repair shops, the most common complaint from car owners is about vehicle noise issues. Usually, several situations need to be distinguished: bearing humming noise will become louder as the speed increases, requiring the replacement of the entire bearing set; exhaust system leaks will produce a hollow popping sound, especially noticeable during cold starts; the ticking sound in the engine compartment may be due to valve clearance or hydraulic lifter issues. A loose feeling in the chassis is often caused by cracked lower control arm bushings, particularly noticeable during sharp turns. Brake squealing is mostly due to worn-out brake pads, and models with wear indicators are easier to identify. It is recommended that car owners pay attention to the operating conditions and locations when the noise occurs, as these details are very helpful for diagnosis.

[VonDallas]

My SUV also suddenly made a roaring noise last time, especially noticeable when exceeding 60 mph. After inspection at the repair shop, it turned out the right front wheel bearing was faulty. Spending 800 yuan to replace it made everything quiet again. A friend's car had an even stranger noise—it was actually the spare tire cover not being tightened properly, sounding like a drum while driving. Paying attention to noise patterns is crucial: for example, noise only during cold starts might indicate an exhaust manifold gasket issue; noise during acceleration could point to a loose turbocharger bracket; squeaking during turns is likely due to aging suspension bushings. Next time you wash your car, remember to ask the technician to check the tightness of the chassis bolts.