What is the reason for abnormal noise when starting but not when driving?
2 Answers
The reason for abnormal noise when starting but not when driving is a malfunction in the engine compartment, where the engine's torque vibration is significant during vehicle startup. Below is relevant information about vehicle abnormal noises: Warranty coverage: Abnormal noises in the car body fall under the warranty coverage. As long as the abnormal noise is due to issues with the car's product quality, consumers can have it repaired for free by the repairer with the three-guarantee certificate. Legal provisions: According to Article 18 of the "Regulations on the Repair, Replacement, and Return of Household Automotive Products," during the warranty period of household automotive products, if there are product quality issues, consumers can have the product repaired for free (including labor and material costs) by the repairer with the three-guarantee certificate.
Last time my car had a similar issue, making creaking or hissing noises when starting, but it got quiet when driving faster. There could be several common reasons. First, the engine belt might be slipping during cold starts. In cold weather, the belt hardens and makes noise when accelerating from a stop, but the sound disappears once the belt softens as the engine warms up. Second, it could be a brake system problem, like brake pads sticking and not fully retracting, causing slight friction against the rotors at low speeds, which reduces as speed increases. Third, loose suspension components, such as worn-out front suspension ball joints or control arms, may produce noise under initial load but stabilize at steady speeds. Fourth, aging wheel hub bearings or insufficient lubrication in transmission connections can cause rattling at low speeds. I recommend checking the easiest things first—feel the brake discs for abnormal heat after parking and inspect the belt tension. If the noise persists, take it to a mechanic. Don’t ignore small issues before they turn into major problems.
