Why does the car keep burning out ignition coils?

[DelZoe]

The main reasons for ignition coil burnout are insulation layer aging breakdown or switching transistor damage. The reasons why ignition coils frequently burn out are as follows: 1. Generator issue - if the power generation is too high, the ignition coil may overload and burn out. 2. Excessive spark plug gap - adjust the gap or replace the spark plug. 3. Poor gasoline quality - switch to higher octane gasoline. 4. Incorrect cylinder compression ratio - adjust the compression ratio. 5. ECU program failure - have the vehicle scanned at a repair shop to clear error messages. 6. Unstable power supply voltage. 7. Excessive primary current from the ignition controller causing ignition coil overheating.

[MacCourtney]

Frequently burning out ignition coils is quite common, and I've seen many vehicles with this issue. The core problem often lies with the spark plugs—if the electrode gap is too wide or they're overdue for replacement, they act like terrible teammates, forcing the ignition coil to work overtime to produce a spark, which inevitably leads to overload. Another culprit can be the alternator acting up, with voltage fluctuating wildly; spikes can literally make the ignition coil self-destruct on the spot. The worst case I've encountered was aging wiring with loose connections causing arcing—temperatures skyrocketed, baking the coil's plastic casing brittle. My advice: first replace the spark plugs with genuine ones, then check the alternator voltage; around 14V is normal. If both check out, grab a multimeter to test the wiring continuity.

[McXavier]

Ignition coils failing consecutively must be taken seriously. Excessive temperature is a hidden killer—if the engine's cooling system is inadequate, the coils endure extreme heat, causing the internal wiring insulation to degrade. Vibration is another culprit; loose mounting bolts or deteriorated rubber mounts allow the coils to shake excessively, leading to internal connection failures. Once, a leaking fuel injector was found to allow fuel vapors to seep into the ignition coil connector, directly corroding the circuit board. It's recommended to replace all spark plugs every 50,000 kilometers—don't wait until the electrodes are completely worn down. Those who have upgraded to high-performance ignition coils should be extra cautious, as exceeding the factory-designed load capacity will lead to costly repairs. After parking, check the coil temperature by touch—if it's scalding hot, it indicates potential issues.

[LaAngelina]

My car used to burn out ignition coils every month until I finally figured out the issue. Those cheap aftermarket parts I bought were such a scam—they'd fail within six months without fail. Only after biting the bullet and switching to genuine OEM parts did the problem stop. Spark plugs must match the heat rating—too low causes carbon buildup and clogging, while too high burns too aggressively, both putting extra strain on the coils. A mechanic taught me to always clean the coil slots before replacing them, as dust and grime blocking the cooling vents will lead to overheating and failure. If you hear sputtering during ignition, that's the coil crying for help. Later, I started regularly checking cylinder pressure—uneven pressure can also cause certain coils to wear out prematurely.