What Causes the Car to Make Abnormal Noises and Fail to Start?

[StHannah]

Here are the reasons why a car makes abnormal noises and fails to start: 1. Low battery voltage. You can turn on the headlights and some electrical devices and check whether the instrument panel and interior lighting dim significantly during the startup process. If they do, it indicates insufficient battery voltage, which cannot drive the engine to reach the starting speed. The repeated engagement of the solenoid and starter relay will produce a clicking sound. 2. Excessive carbon buildup in the intake pipe. Excessive carbon deposits on the throttle valve and idle speed motor prevent the engine's air-fuel mixture from reaching the required ratio, causing the vehicle to fail to start. The repeated engagement of the solenoid and starter relay will produce a clicking sound. 3. Insufficient fuel supply in the fuel system. This phenomenon is essentially the same as excessive carbon buildup in the intake pipe, as it also prevents the engine's air-fuel mixture from reaching the required ratio, causing the vehicle to fail to start. 4. Faulty starter motor or related circuits. The solenoid coil cannot maintain engagement and cannot provide starting torque, resulting in the engine's failure to start and producing a clicking sound. 5. Ignition system failure. This directly causes the engine to fail to start. If the ignition key remains in the starting position, the starter relay will repeatedly engage, also producing a clicking sound.

[Don]

When my car wouldn't start and made a clicking sound, I checked the starter motor and found the gear was stuck causing abnormal noise, while the battery voltage was insufficient. It's recommended to first test the battery with a multimeter. If it shows below 12V, try charging it or replacing it with a new one first, then check if the motor circuit is aged or worn. Don't rush to call a tow truck, as you can save some money by replacing parts yourself. Usually, avoid holding the ignition button for too long when parking.

[VanLuna]

If the car won't start accompanied by a buzzing sound, it could be due to a faulty fuel pump or an empty fuel tank. I've experienced this in cold weather before, where the fuel pump was clogged, causing insufficient fuel pressure for engine startup. First, listen to determine if the abnormal sound is coming from the rear of the car or under the engine. Replacing the fuel filter and cleaning the fuel lines can often solve the problem easily. Don't neglect regular refueling habits to prevent fuel pump overheating and damage.

[DelLeila]

As a novice, I panicked when encountering this issue for the first time—the car made strange noises and wouldn't start. I immediately called a friend for help. It might just be a loose starter wire causing poor contact; simply loosening and tightening the screws could fix it. If the strange noise is near the wheels, it could be debris stuck in the brake discs, leading to a misdiagnosis.

[SarahRose]

When starting the car at home, if you hear a clicking sound but the engine doesn't start, it's likely due to a faulty ignition coil or spark plugs. Pay attention to the rhythm of the sound during cold starts: slow clicking often indicates a weak battery, while rapid clicking suggests an ignition coil issue. For peace of mind, it's best to visit a repair shop for a comprehensive inspection of the electrical system to prevent other potential hazards.

[MacNora]

From experienced drivers' perspective, a car failing to start with abnormal noises is often due to a damaged starter or worn-out belts; recalling the old days, motor repairmen often taught us to gently tap the starter housing with a hammer for a test start, but this method is no longer recommended for modern cars as it can easily damage electronic components; it's advised to use an OBD scanner to check for fault codes and determine if abnormal engine sensors are causing the noises.