What Causes the Zizzing Sound When Driving a Car?

[Malia]

The reasons for a zizzing sound when driving a car include: 1. Loose engine mount bolts causing improper installation of the engine support; 2. Loose or aged belts, which can be resolved by replacing them with new ones; 3. Worn brake pads, where the brake drum comes into direct contact with the vehicle. If a metal scraping sound is heard during braking, it may indicate that the brake pads have worn down to the raised sections, causing friction with the brake disc and producing abnormal noises, necessitating timely replacement. Additionally, if the car has not been started for a while, the engine oil will drain back to the oil pan, leaving the valve chamber with insufficient oil. Due to the lack of oil for sealing and lubrication in the valve chamber, a zizzing sound may be heard from the bottom of the car upon startup.

[LaIsabelle]

There are many possible reasons for a car making a zizzing sound while driving. The most common issue is related to belts - such as the alternator belt or AC belt being loose or worn, which creates that friction noise during operation. You can check the belt tension yourself, and adjust or replace it if loose. Worn brake pads are another frequent cause - when the pads thin out, the metal backing will rub against the brake disc creating squeaking sounds, requiring prompt replacement to maintain braking safety. A failing wheel bearing can also produce squeaking noises, especially noticeable during turns, which requires professional repair. Other possibilities include loose small components in the engine bay vibrating, or exhaust system leaks. I recommend first stopping to locate the sound source - simple fixes like tightening belt screws may help, but regular maintenance is best for prevention. I once ignored a loose belt on an old car until it snapped and left me stranded - a hard lesson learned. Paying regular attention to these areas can save both hassle and money.

[EzraLee]

The annoying squealing sound might seem trivial, but don't underestimate it—it could hide safety hazards. For instance, excessively thin brake pads rubbing against the discs can reduce braking efficiency, increasing the risk of accidents during emergencies. Worn or broken belts may cause engine stalling, which is particularly dangerous at high speeds. Faulty bearings can destabilize wheel rotation, raising the risk of losing control. So, upon hearing such noises, take action immediately: first, check the brake pad thickness and replace them if under 3mm; inspect belts for cracks and tighten if loose. However, avoid DIY fixes—safety comes first. Get a professional diagnosis at a repair shop promptly. I've seen a friend ignore these sounds, only to suffer brake failure in a minor collision, filled with regret later. Remember, addressing small issues early ensures safer driving.

[OwenFitz]

The buzzing sound is easy to check. First, park and locate the source: the front might be a loose belt, while the rear is often a brake pad issue. Open the hood to check if the belt is worn or loose; a gentle press can tell. For brake pads, check the thickness through the wheel—replace if thin. If it's a bad bearing, the sound changes when turning. Try tightening the belt screws yourself, but don’t over-tighten to avoid damage. If the sound persists, visit a professional shop. Regularly inspect these areas during car washes to prevent issues. Simple maintenance can save big trouble.