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Ignition Coils

We have ignition coils at incredible prices. We purchase in bulk, and sell directly to the consumer. From single coils to full sets of coils. Select the make of your vehicle to find out how much money you can save.


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What Are Ignition Coils?                                         Pencil Style Ignition Coils                            Basic Ignition coil Internals   


An Ignition coil is a miniature power transformer for your car, truck, or SUV. While modern ignition coils are called individual coils, or coil on plugs, many still refer to these using the old term "coil packs". The job of an ignition coil is to convert the 12v power supply from the battery to tens of thousands of volts. This is done through many turns of copper wire. They have primary and secondary coil windings hence the name (ignition coil) that surround an iron core. Unlike a power transformer, which has a closed loop, an ignition coil has an open circuit as the power stored in the magnetic field of the core is transferred to the spark plugs.

Ignition coils use an Epoxy resin (the stuff that looks like glass) to surround all areas of the the primary and secondary windings. Some ignition coils you may notice have multiple coils packed together in one unit surrounded by the epoxy. This is referred to a "coil pack". A very popular coil on plug is the DG508 ignition coil Other types of ignition coils are "waste spark". Waste spark is when the engine uses half the number of coils as it does cylinders. For example, a V6 engine with a waste-spark system will use just three ignition coils. The 2001 3.4L V6 4 Runner is a great example of this. This allowed for better control over a tradition distributor system, but was cheaper than using all 6 ignition coils. Then, there is a twin spark system. Some vehicles have 2 spark plugs per cylinder such as some Mercedes Benz vehicles or Hemi V8 Dodge and Chrysler vehicles. One ignition coil will have two terminals that connect to the spark plug. This is used on higher performance vehicles to make for a much stronger spark, allowing the vehicle to run much lower timing, while still being able completely burn off the fuel in the cylinders. 


Why do ignition coils need to be replaced?

Ignition coils wear out in many different ways. Over the years the epoxy resin/insulation may develop small or large cracks, allowing moisture to make its way into the coil windings. This can result in a partial misfire (also known as hiccuping or surging feeling when driving) or a complete blowout of the windings. The rubber and plastic boots can also develop cracks in them allowing the spark to arch out before it reaches the spark plug. Old spark plugs and spark plugs with large gaps cause the coil to run hotter than normal and fail prematurely. Other reasons for failures can be bad grounds, or other electrical problems.

A bad ignition coil will usually show a check engine light. With an OBDII scanner, you will see codes from:

  • P0301 (Cylinder 1 misfire)
  • P0302 (Cylinder 2 misfire)
  • P0303 (Cylinder 3 misfire)
  • P0304 (Cylinder 4 misfire)
  • P0305 (Cylinder 5 misfire)
  • P0306 (Cylinder 6 misfire)
  • P0307 (Cylinder 7 misfire)
  • P0308 (Cylinder 8 misfire)
  • P0309 (Cylinder 5 misfire)
  • P0310 (Cylinder 10 misfire)
  • P0311 (Cylinder 11 misfire)
  • P0312 (Cylinder 12 misfire)


P0300 is random misfire. Other ignition coil related codes are P0351 (Coil A ignition coil primary or secondary circuit malfunction) all the way through P0362 (Coil L).

If the misfire is not consistent, some vehicles will not show a check engine light. Some makes will still record the occasional misfires in the computer. In our how-to section, we help you find these!


Looking to Replace Your Ignition Coils?

We have ignition coils at a fraction of the dealer prices available. We buy hundreds, or even thousands of a single ignition coil type  (part number/SKU) at a time. This allows us to get real wholesale prices on the same quality aftermarket products you can buy locally, and of course, we sell direct. On top of a product warranty, and customer service, this is what truly makes us unique in our operation. If you have been wondering where to buy those ignition coils, or if you have any questions, contact us at (916) 585-6835, and let us get you taken care of!