What's the reason for the engine not starting?

[MackenzieAnn]

The following are the fault reasons that cause the engine to fail to start: 1. Gasoline flow blockage, characterized by no oil pressure in the engine fuel supply pipe. This situation mostly occurs on particularly cold mornings and is caused by long-term dirt accumulation in the fuel pipeline. When the temperature is extremely low, water and debris mix to block the fuel pipeline, resulting in the inability to start. 2. Poor working condition of the ignition system. In cold weather, due to the low intake air temperature, the fuel does not atomize well in the cylinder. If combined with insufficient ignition energy, the result will be cylinder flooding, where excessive fuel accumulates in the cylinder, exceeding the ignition limit concentration and preventing the engine from starting. 3. Valve gumming. In winter, using unclean gasoline can cause the non-combustible gum in the gasoline to accumulate near the intake and exhaust valves and the combustion chamber, making it difficult to start on cold mornings or even preventing ignition.

[LaMila]

When the engine won't start, I always suspect the battery might be the primary issue. For example, in cold weather or if the car hasn't been used for a long time, the battery can easily lose charge, causing dim dashboard lights and no response when pressing the key. In such cases, you can try jump-starting the car. If you hear a whirring sound, the starter might be faulty, and replacing it can solve the problem. Another common issue is a blown fuse—those small pieces hidden in the fuse box—which cuts off the current when burnt and needs to be checked and replaced. Loose or corroded wiring connections are also frequent culprits; cleaning the terminals or tightening the connections can help. If the alternator malfunctions, the battery won't charge fully, leading to long-term starting difficulties. I recommend regularly checking the battery's condition, especially for older cars, and not hesitating to replace it when necessary. Routine maintenance and professional inspections can save a lot of trouble.

[EllianaFitz]

If the engine cranks but fails to start, the fuel system is likely the culprit. A faulty fuel pump can't deliver gasoline to the engine, preventing ignition. Clogged fuel injectors are common after using low-quality fuel, which can be resolved by cleaning or replacement. A dirty fuel filter also restricts fuel supply, so regular replacement prevents problems. Even small components like relays can cause trouble - if the part controlling the fuel pump fails, the entire system shuts down. I've encountered low fuel pressure situations where diagnostics revealed burnt fuel pump coils. Always refuel at reputable gas stations to ensure fuel quality; inspect the fuel system every 10,000 kilometers, including filters and lines. Developing this maintenance habit significantly reduces starting issues.

[DeKate]

Starting failures are often caused by ignition system issues. Worn spark plugs or improper gaps can prevent the ignition of the air-fuel mixture, while carbon buildup on aging spark plugs can impair performance. A faulty ignition coil or distributor can also disrupt the process. If the wiring is old and broken, current won't reach the ignition components, preventing startup. Simple fixes, such as replacing the spark plugs, can resolve most starting problems—especially when there's a weak spark but no ignition during startup. Before starting, check the condition of these components and perform maintenance or adjustments as needed to ensure system reliability.