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30% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

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Receive Up To 30% Off Your Online Purchase Of Select Parts And Accessories
Use promotional code MMJ30 at checkout to receive 30% off the following categories: Select Brake Parts, Select Hi-Performance and Truck Accessories, Batteries, Water Pumps, Belts, A/C Parts, Starters, Alternators, Fuel Pumps, Radiators, Radiator Fans, Thermostats, Caps & Clamps, Clutches, Spark Plugs, Plug Wires, Chassis, CV Axles, Batteries, Battery Chargers & Booster Cables, OE Locks, Rack & Pinons, Window Motors, RainX Wipers, Appearance Chemicals, Car Wash Accessories, Floor Mats, Lift Equipment, Hand Tools, Travel Accessories, Outdoor Lifestyle, Towing, Car Covers, Seat Covers, Wheel Covers, Body Repair, Collectibles and Apparel.

Use promotional code MMJ20 at checkout to receive 20% off the following categories: Shocks & Struts, Ignition, Air Filters, Oil Filters, Bearings & Seals and Engine Parts.

Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes the following brands: Champion, 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, Philips and BBK Performance. Valid online until 2:59 am EST on 8/8/17.

Receive 25% Off Wagner branded brake parts with your online purchase. Use promotional code: WAGNER25.

Receive 10% Off Select Champion, MOOG and FelPro branded products with your online purchase. Use promotional codes: CHAMP10, MOOG10 and/or FELPRO10.

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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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