What Causes Abnormal Noises When Starting the Car?

[Norma]

Abnormal noises when starting the car can be caused by the following reasons: 1. Abnormal noises caused by rusted brake discs/pads: The brake disc and brake pad may stick together due to rust, causing abnormal noises. This usually occurs after driving in rainy weather or after the car has been parked for an extended period. When the rusted brake disc and pad stick together, abnormal noises may occur upon restarting the car. This issue can be resolved by applying butter or specialized lubricant to the connection point between the brake pad and brake caliper. 2. Excessive wear of the brake disc and brake pad: Both the brake disc and brake pad are high-wear components. Every time the brakes are applied, these two parts experience friction, which naturally leads to wear over time. When the wear becomes excessive, abnormal noises will occur. Therefore, regular inspection and replacement are necessary. Typically, brake pads should be replaced every 60,000-80,000 kilometers, while brake discs should be replaced every 100,000-120,000 kilometers.

[LeilaniLynn]

When I start driving, there's an abnormal noise, most commonly caused by issues with the clutch or transmission. Excessive wear on the clutch disc can produce a squeaking sound, or improper pedal adjustment may lead to slipping noises. Additionally, unstable gear meshing in the transmission can cause a rattling noise during low-speed starts. For rear-wheel-drive vehicles, a loose driveshaft or worn differential can also create noise during acceleration. I’ve also noticed that problems with chassis suspension components, such as aging or cracked ball joint bushings, can be more noticeable when starting on bumpy roads. It’s best not to delay repairs, as this could affect the lifespan of the drivetrain and increase repair costs. I recommend getting a diagnosis at a reputable auto repair shop—they can use stethoscope tools to pinpoint the issue accurately. Safety first!

[LeNoah]

When driving a manual transmission car, I encounter abnormal noises during startup, which are usually closely related to the drivetrain. A loose universal joint on the driveshaft can cause a clicking sound when accelerating, and worn differential gears can amplify noises when starting in a turn. Some engine mounts may age, causing engine vibrations to transmit to the chassis and produce abnormal sounds. Modified cars require extra attention to check if the exhaust pipe hangers are damaged. These areas are not difficult to inspect; you can check the body's shaking condition yourself. Regular maintenance of chassis components during servicing can prevent minor issues from escalating into major problems, reducing driving risks.

[StLucas]

With years of driving experience, I know that startup noises are mostly simple issues. Brake discs rust and cause friction noise, or worn shock absorber bushings squeak when you step on the gas. If it's just a single noise and stops, it's no big deal; but if it persists, check the clutch or suspension. Don't overthink it.