What Causes the Abnormal Noise When Starting the Vehicle?

[MaryDella]

First, determine whether the abnormal noise occurs at the moment of starting or during idle after starting. Below is a detailed introduction: Introduction 1: If the abnormal noise occurs at the moment of starting, it is likely due to a fault in the carbon brushes inside the starter motor. Introduction 2: If the abnormal noise occurs during idle after the engine starts, it is likely caused by excessive clearance between the hydraulic lifters and valves inside the engine cylinder head. As the vehicle's mileage increases, both the engine valves and hydraulic lifters will experience some wear. When the clearance becomes too large, a "clicking" abnormal noise will occur. To resolve this issue, simply disassemble the cylinder head and replace these two components.

[OAlana]

Having driven for decades, I've encountered many instances of vehicles making squeaking or clunking noises when starting off. This is usually due to the clutch plates of manual transmission cars being nearly worn out, especially when shifting gears becomes particularly jerky. It could also be caused by loose components in the suspension system, such as aging ball joints or bushings, leading to body sway and noise during acceleration. Brake system issues shouldn't be overlooked either, like poor contact between discs and pads or insufficient lubrication. Upon hearing such sounds, it's crucial to inspect immediately to avoid breaking down midway. I once neglected repairs and ended up having to replace the entire transmission, costing a fortune. Regular maintenance can prevent such issues, and I recommend visiting a professional shop to inspect the chassis using a lift.

[ReaganMarie]

I just learned to drive not long ago, and my car makes a strange rattling noise as soon as it starts moving, which scared me into a sweat. I've looked up a lot of information, and it's said that it could be due to worn drive shafts or loose engine mounts—these parts connect the engine to the frame, and if they're unstable, they can make a clunking sound. Additionally, if the brake discs are warped or there's an issue with the calipers, they might also produce friction noises when starting. If you encounter this situation, don't drive far; find a safe place to pull over, listen to whether the sound is coming from the front or rear wheels, and try gently shaking the tires to see if they're loose. Then, contact a repair shop as soon as possible. New drivers can easily panic, but addressing the issue early can save you trouble.

[ChloeDella]

Common causes of abnormal noises during vehicle startup include clutch or driveshaft damage. For manual transmissions, excessive wear on the friction discs can produce a squeaking sound. In automatic vehicles, issues with the torque converter or insufficient transmission fluid can also cause similar noises. Aging suspension components, such as control arm bushings, are another factor, as they tend to make noise under the initial load during startup. I recommend first identifying the type of sound—sharp noises may be related to bearings, while dull sounds could involve the drivetrain. Don’t underestimate this issue; delaying repairs can damage other components. It’s best to have a technician inspect it with diagnostic tools.