What Causes the Zizzing Sound When Starting the Car Engine?

[VonAdaline]

The reasons for the zizzing sound when starting the car engine: 1. Check the tightness of the belt. If the car belt is loose, it will produce a zizzing sound, and you should take it to a repair shop for inspection; 2. If the car has not been used for a while, the engine oil will return to the oil pan, and the valve chamber will lack oil. Without the sealing and lubrication of the oil, you will hear a zizzing sound when starting the car. The engine is a machine that converts other forms of energy into mechanical energy. It was invented in the UK and can refer to both the power generation device and the entire machine including the power device. Types of engines include internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines and steam engines), and electric motors.

[VanViolet]

A buzzing sound when starting the car engine can be caused by several factors, such as belt slippage or looseness. The most common is the alternator belt rubbing back and forth, producing that squeaking noise; if the belt is aged or cracked, it can be particularly noticeable under the high load of startup. Alternatively, the starter may have issues, such as worn internal gears or brush problems, causing uneven current flow. I once experienced this sound and later found the belt wasn’t tensioned properly—adjusting it fixed the issue. Low battery voltage can also strain the starter, creating similar noises. In short, don’t ignore it; get it checked early to avoid worsening into starter damage or breakdown. It’s best to have a trusted technician inspect the electrical system.

[StLeonardo]

The annoying squealing sound during startup might come from belt friction or starter motor issues. If it's the belt, a loose alternator or AC belt can slip and cause squeaking; or a partially stuck and worn starter can produce similar noises. Low battery voltage may also make the motor struggle and whine. With decades of driving experience, I've heard this sound multiple times—ignoring minor issues led to broken belts and costly part replacements. I recommend manually inspecting the belt first—replace it if cracked. Don't overlook safety concerns; address them promptly to avoid stalling hazards on the road.

[Gia]

A buzzing sound during startup usually comes from belt or starter issues. For example, belt slippage causes friction noise, while worn starter gears produce squeaking. If the battery is weak, the motor may also buzz when struggling. I've fixed this problem before - simply tightening the belt worked. Don't ignore minor issues; early inspection can prevent major repairs.

[SanBryce]

The engine making a sizzling noise upon startup is likely due to abnormal belt system conditions, such as a loose or aged alternator belt slipping; worn internal components of the starter like carbon brushes or gears can also produce similar sounds. I once ignored it, and later the starter seized up, costing much more to repair. It's advisable to identify the sound source: front-end noises often indicate belt issues, while rear sounds near the starter warrant checking electrical connections. Additionally, inspect the battery's lifespan as low voltage exacerbates the problem. Acting promptly reduces risks, preventing startup failures from causing trouble.