What Causes the Abnormal Noise When Starting a Car?

[SanAshley]

There can be multiple possibilities for abnormal noises in the engine compartment. Engine noises indicate that the technical state of a certain mechanism in the engine has changed, primarily due to excessive wear of some parts or improper assembly and adjustment. Some noises may even signal potential catastrophic damage to the engine. Therefore, when abnormal noises occur in the engine, timely repairs are necessary to prevent further damage. If the noise originates from inside the engine, most car owners cannot resolve it themselves, and it is best to send the vehicle to a professional repair shop. Here is some additional information: 1. Transmission Abnormal Noise: If there is a "rustling" sound inside the transmission while driving, which disappears when the clutch or accelerator is pressed, and a whistling-like sound occurs during gear shifting, it may indicate transmission issues. The transmission has many components, and the causes of noise are complex. When analyzing and diagnosing, pay attention to whether the noise is related to specific speeds or certain gears. This is crucial for identifying transmission faults. If a particular gear produces noise, it is likely related to the components affecting that gear's transmission. If all gears produce noise, it often indicates a fault in the constant-mesh gear shaft or insufficient transmission oil. Also, observe whether the noise is related to specific actions, such as shifting gears, starting, rapid acceleration, sudden deceleration, or turning. These actions are effective indicators for diagnosing abnormal noises, with speed and direction changes being particularly important for identifying rear axle issues. If the transmission noise is significant, it is advisable to send the vehicle to a professional repair shop to identify and replace the faulty components. 2. Wear-Related Abnormal Noise: When pressing the accelerator or brake while driving, there may be some minor noises from certain parts of the car body. These sounds are not loud and do not affect normal driving, but they can raise concerns about potential faults. Door noises are mainly caused by insufficient lubrication. It is important to determine whether the noise comes from the door hinges or internal components like the window regulator, door lock mechanism, or handle mechanism. For door hinges or limiters, specialized door hinge and track grease should be used. For internal components like the window regulator, door lock mechanism, or handle mechanism, specialized door accessory grease is recommended.

[MacRemington]

I've encountered car ignition abnormal noises multiple times. The most common issue is starter system failure, such as gear wear or bearing damage, which produces clicking or grinding sounds during startup. Additionally, insufficient battery charge or oxidized terminals can cause unstable current, resulting in buzzing or crackling noises during ignition. Another common problem is aged and loose engine belts that squeal when driving the water pump. I recommend first checking battery voltage and connection tightness, then inspecting the starter condition if those are fine. Regular maintenance like cleaning terminals or adjusting belt tension every six months can reduce abnormal noises. Don't ignore these minor sounds - they often signal component failure. Early repairs can prevent subsequent safety risks like startup failure or roadside breakdowns. Remember these key points and regular maintenance will keep you worry-free.

[Craig]

The other day when I started my car, I heard a sharp squealing noise and got really worried. A car-savvy friend told me it might be a belt issue or friction in the starter. Later, I discovered it was actually caused by loose battery terminals creating a discharge noise, which was fixed by tightening them. If the belt is loose or cracked, it'll squeal when the engine starts; a stuck starter can also make a clicking sound. My advice to fellow drivers is to start with the basics: check the dashboard indicators before ignition and inspect the battery's condition. Regular vehicle maintenance is crucial—I do a comprehensive check every season to catch issues early. Even minor noises can escalate into major problems, so don't delay; sharing experiences and keeping your car in good health ensures peace of mind while driving.

[DeRyder]

Abnormal noises during car ignition are not only annoying but also pose safety hazards. The most common causes are worn starter gears or loose belts triggering unusual sounds. Continuing to drive with these issues can lead to a broken belt, obstructing the cooling system and causing engine overheating accidents. I strongly recommend stopping to inspect immediately upon hearing any abnormal noise and visiting a professional repair shop for a quick diagnosis. For example, first test the battery voltage, then check the starter's condition or belt tension. Safety should always come first—don’t risk major losses for minor issues. Develop the habit of paying attention to engine sound changes during ignition to address small problems early.