What is the problem when a car won't start?

[DelClara]

Car won't start reasons are: 1. Ignition system: The vehicle's spark plugs are faulty and cannot ignite; 2. Fuel injection system: The fuel injectors are faulty, and the fuel pump's supply pressure is insufficient; 3. Starting system: The battery does not have enough power to drive the starter motor. Solutions for a car that won't start are: 1. Replace the fuel filter and fuel pump screen; 2. Check and replace the spark plugs; 3. Repair the starter motor; 4. Inspect and repair the power supply lines; 5. Check the battery charge and recharge it in time; 6. Press the accelerator when starting to increase air intake and fuel injection; 7. Clean the fuel injectors.

[Kirk]

I often encounter this situation, mostly due to a dead battery, especially in winter when it's more prone to happen. First, check if there's a clicking sound or no response when turning the ignition key. If there's sound, it might be a starter motor issue; if no sound, inspect the battery terminals for looseness or corrosion. Batteries typically last three to five years—measure the voltage, and if it's below 12V, you'll need to charge or replace it. Running out of fuel is another common reason; if the fuel gauge is inaccurate, try filling up a tank. Avoid using too many electrical devices in the car daily and maintain timely charging to prevent issues. If starting is difficult, don't force ignition to avoid engine damage—seek help from a mechanic first.

[ThomasLee]

When the vehicle fails to start, prioritize checking the power supply. Insufficient battery charge is the most common issue—use a multimeter to measure the voltage between the positive and negative terminals; anything below 10V is dangerous. A damaged starter relay or motor can also cause ineffective cranking—replace the component if you hear unusual noises. Next, inspect the fuel system: a failed fuel pump or low fuel pressure can prevent the engine from starting. I've encountered many cases of spark plug carbon buildup or faulty ignition coils—scanning with an OBD-II scanner can help pinpoint the issue. Regular maintenance checks on these components are essential.

[VonBrody]

Last week my car suddenly wouldn't start, and I was so anxious that I checked for a long time. The key wasn't inserted properly and triggered the anti-theft lock, which was resolved by repeatedly removing and reinserting it to reset. I also dealt with rusted battery terminals - just wiping them clean restored normal function. As a new driver, I often forgot to turn off the lights, draining the battery and requiring jumper cables to borrow power from a friend's car. It's recommended to always keep an emergency power source on hand to reduce such troubles.