What's the reason the engine won't start?

[StAlice]

There are several main reasons why an engine won't start: 1. Check if components like spark plugs and high-voltage wires got wet due to the car being exposed to rain. If so, dry the damp parts before attempting to start the engine. 2. Inspect whether the spark plugs are damaged: If they are, simply replace them with new ones. Generally, modern car spark plugs have a service life of 20,000 to 30,000 kilometers. 3. Verify if the battery voltage is sufficient: Check the battery's inspection window - green indicates normal operation; black means it needs recharging or maintenance; white means the battery needs replacement.

[Joseph]

Last time my car's engine wouldn't start either, and after struggling for a long time, I finally realized the battery was dead. Old batteries or low winter temperatures can easily cause problems. Check if the battery's positive and negative terminals are loose or corroded, and use a multimeter to measure the voltage. If it's below 12 volts, replace it immediately. If you only hear a clicking sound when trying to start but the motor doesn't turn, it's likely the starter motor is stuck or burnt out. Also, don't forget the fuel tank—if the fuel gauge is at zero, it definitely won't start. I made this mistake myself, and filling up the tank solved the problem. Additionally, a blown circuit fuse can also affect starting, so check if the dashboard lights are functioning normally. If you really can't figure it out, taking it to a repair shop for diagnosis is the safest option.

[FrankLee]

As a DIY enthusiast who enjoys tinkering with car repairs, I always start with the basics when the engine won't start. First, check if the battery terminals are tight and clean—clean them if corroded. Next, inspect the fuse box; replace any blown fuses related to headlights or the starting system. If the engine doesn’t respond, listen for sounds: complete silence suggests a weak battery, while a whining noise points to a starter motor or belt issue. Also, check the fuel system—is the fuel pump working? Crouch near the rear of the car while starting it to listen for a humming sound. I keep spare fuses handy for emergencies. Remember to inspect these components regularly to prevent problems before they arise.

[SpencerRose]

Engine starting failure is often caused by three main factors: insufficient power such as aging batteries or inadequate alternator output; ignition system failures like spark plug carbon buildup or damaged ignition coils; and fuel supply interruptions including fuel pump failure, clogged filters, or injector issues. Inspection steps: Use diagnostic tools to read fault codes and check if voltage and fuel pressure are normal. Older vehicles commonly have spark plug issues, while newer models may experience ECU interference. Extremely cold temperatures can also affect diesel engine starts—try adding preheating pads. Safety first—avoid repeated forced starts that may damage the engine.

[SanColton]

It's really troublesome when the engine won't start, so it's better to deal with it quickly to avoid breaking down midway. First, ensure safety before taking action: turn on the hazard warning lights, and don't force it on the roadside. Check the dashboard warning lights; if the battery light is on, the battery might be dead, requiring a jump-start. If there's no response, listen for the starter motor sound. Regular maintenance is essential—test the battery health every six months and clean the terminals. When towing to the repair shop, don't overlook possible interference from the air conditioning system or anti-theft device; professional diagnosis is the way to go.