Why do cars catch fire spontaneously?

[StFinley]

Electrical leaks, oil leaks, and electrical failures/short circuits can cause vehicles to spontaneously combust. The specific reasons for vehicle spontaneous combustion are as follows: 1. Electrical leaks and oil leaks: When the engine is running, the high temperature of the ignition coil can soften, age, and crack the insulation layer of high-voltage ignition wires. This makes it easier for high-voltage electricity to penetrate the insulation layer, resulting in electrical leakage. The temperature at the leakage point continuously rises, igniting gasoline leaking from the engine or carburetor, ultimately leading to fire. 2. Grounding faults: Among spontaneous combustion accidents caused by wiring issues, the primary cause is grounding faults. Particularly, many new car owners, being overly protective of their vehicles, may install anti-theft devices, upgrade premium audio systems, or modify appearances. These actions can potentially cause wiring grounding faults, leading to vehicle fires. 3. Electrical failures/short circuits: Common scenarios include starter switch contacts welding together due to sintering, preventing the starter solenoid from disengaging. This results in prolonged starting time (safe starting time for starters is 5 seconds), causing the starter to overheat and catch fire. 4. Carburetor backfire: During driving or startup, vehicles may sometimes experience carburetor backfire, which can also lead to spontaneous combustion.

[OMalachi]

I find car spontaneous combustion quite alarming, primarily caused by electrical system failures leading to short circuits and fires. There are numerous wires in a car, and if they age or get damaged by rodents, combined with hot weather or prolonged long-distance driving, the wires can overheat and potentially short-circuit, sparking. Batteries can also cause trouble, such as overheating and exploding when aged or leaking electricity due to loose connections. Add fuel system leaks into the mix, where oil drips onto hot components, and you've got instant ignition—like when the engine is running at high temperatures. I've seen cases where older cars without proper maintenance are more prone to such incidents. It's advisable to regularly check for any exposed wiring and avoid installing additional electronic devices haphazardly to prevent overload. During hot weather, try not to park in the shade for too long; driving reduces the risk. Overall, electrical faults are the main culprit, but proper maintenance can prevent most issues.

[LaAliyah]

As a veteran driver with decades of experience, I've noticed that most spontaneous combustions are caused by fuel leaks or negligence. Simply put, if the fuel line leaks, the fuel tank cracks, or the fuel line connection loosens, fuel can seep out and ignite upon contact with sparks in the engine area or the hot exhaust system. Don't underestimate these small leaks; prolonged driving with strong vibrations can cause parts to wear out and leak oil. I've even encountered cases where a carelessly discarded cigarette butt started a fire, so never throw trash recklessly after smoking. Batteries are also common culprits; lead-acid batteries can overheat and explode internally when they age. To prevent fires, make it a habit to check if the fuel cap is tight, replace fuel lines regularly, and avoid keeping flammable materials like cardboard or oil cloth in the car. Remember, small hazards can pile up into big trouble, so diligent maintenance is key.

[VonJesse]

I guess you've also worried about your car catching fire, right? Actually, it's often the accumulation of minor issues. Overloaded aftermarket electronics are common culprits, like installing high-power audio systems or LED lights—when the wiring can't handle it, they overheat and short-circuit, causing fires. Another issue is improper parking; low engine coolant or a broken cooling fan can lead to overheating, especially when parked under the sun all day in summer. Don’t overlook battery problems either—improper charging of lithium batteries in electric vehicles can cause thermal runaway and explosions. I think young car owners should pay attention to this—don’t cut corners with cheap modifications or neglect maintenance. Just spend a few minutes each month checking the fuel lines and wiring. After all, saving a little money isn’t worth risking a major fire. Safety first—don’t cut corners.