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15% Off All Online Orders of Select Parts and Accessories
Receive 15% Off Your Online Purchase. Use promotional code MMJ15 at checkout to receive discount. Not valid in combination with any other discounts or promotions. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Excludes the following categories: Tires, Batteries, Wheels, Oil, Antifreeze, Refrigerant, Truck Boxes, Vent Visors, Bug Shields and BRANDS: Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner, Champion and BBK Performance. Valid online until 2:59 am EST on 2/2/17. Online orders scheduled for in-store pick up must be completed by closing on 2/1/17 for discount to apply.

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Ignition Coil


Ignition Coil

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.

What are Ignition Coil and how do they work

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 the Symptoms of Failure?

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

What are the Implications of Failure?

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

How Difficult is the Install?

Difficulty Rating:

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