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All cars have an ignition system with one or more ignition coils. Ignition coils are designed to convert the low-voltage from the battery into the high-voltage needed to fire the spark plugs.

Because ignition coils are such an integral part of the ignition system, they almost always cause noticeable symptoms when they fail.

Signs of a Bad Ignition Coil

Do you think your car might have a bad ignition coil? If you’re experiencing one or more of the following symptoms, you may be right.

Engine Misfire

Since ignition coils play a role in igniting the engine’s air-fuel mixture, a faulty coil can easily cause a misfire. A misfire happens when there’s incomplete combustion (or zero combustion) inside one or more of the engine’s cylinders.

The phenomenon will feel like a hesitation or shaking when the car is running. You may notice the problem intensifies when the engine is under a heavy load (e.g., accelerating).

Illuminated Check Engine Light

On modern cars, a computer (often referred to as the powertrain control module), looks for problems that could potentially lead to an increase in vehicle emissions. One such problem is an engine misfire caused by a faulty coil. The PCM will usually detect the misfire—and possibly an issue with the coil’s electrical circuit—and turn on the check engine light.

Car Won’t Start

While most modern engines have one ignition coil per cylinder, older vehicles use a single coil to supply voltage to all of the spark plugs. If that lone coil fails, none of the cylinders will receive spark, resulting in a car that cranks but doesn’t start.

The Engine Stalls
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