What causes the abnormal noise when the car just starts moving?
3 Answers
When the car just starts moving, there is an abnormal noise. The following reasons can summarize this phenomenon: 1. Long engine service life: Some cars have engines that have been used for too long, and each time they start, the idle speed is high, resulting in this abnormal noise. 2. The engine oil used during car maintenance is also a reason: Expensive engine oil is not necessarily good; it must be suitable for your car. Unsuitable engine oil can cause certain abnormal noises. 3. Belt wear: Cars with long service lives need belt replacements, and belt wear can also produce this sound.
My old car makes creaking noises from the chassis during cold starts, and I found out it's due to cracked and aged control arm bushings. Rubber components harden and become brittle over time, causing friction sounds like dry bearings when the wheels first bear load. I recommend focusing inspections on suspension linkage joints and ball joints, especially during rainy seasons or cold weather—these issues become particularly noticeable. Placing a cardboard under the chassis when parked can help spot oil leaks by checking for stains the next day. If the noise worsens during turns, it’s likely the steering tie rod dust boot is torn—replace it promptly to prevent grit from damaging the universal joint.
Last time my car made a clicking noise as soon as it started moving, and the mechanic said it was the brake pads sticking to the caliper. When the metal shims and brake discs get damp or slightly rust after washing the car, they can produce a sharp friction sound at the moment of starting. Additionally, if the exhaust pipe gasket ages and loosens, the vibration from the engine ignition can transmit through the gaps, creating a metallic knocking sound that disappears once the car warms up. It's especially important for new car owners to distinguish between the normal ABS self-check sound and abnormal noise from faults. The former sounds like a small motor running for a few seconds, while the latter is a persistent mechanical noise that doesn't go away.
