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An ignition coil transforms your battery’s low-voltage electrical power to high-voltage currents. This ignites the fuel by creating an electrical spark in the spark plugs.



How Does it Work?

  • Ignites the fuel with a timed spark
  • Ignition coils may work as a single independent component igniting all engine cylinders, as individual coils assigned one-per-cylinder or in packs serving multiple cylinders
  • An ignition coil takes nominal voltage from the battery (typically 12V) and steps it up to fire the spark plugs to as high as 60,000V

How Is It Made?

  • Ignition coils can be either oil-filled or solid state (epoxy filled)
  • Molded housing with electrical connections
  • Configuration is the same whether it is a single coil configuration or one coil per cylinder

Why Does It Fail?

  • Over time, heat breaks down the dielectric strength (resistance to shorting and grounding) of the part

What are Symptoms of Failure?

  • Misfiring or dead cylinder
  • Engine not running
  • No-spark condition

What Are the Consequences of Failure?

  • Ignition coils can fail completely or intermittently
  • A total coil failure will result in a no-spark condition
  • Engine won’t run

If you have questions or concerns about ignition coils or any of your vehicle’s components, come into your local Pep Boys where we can answer any question, help you find any part, or perform any vehicle service you might need.