Ignition Coil

The coil is a simple device -- essentially a high-voltage transformer made up of two coils of wire. One coil of wire is called the primary coil. Wrapped around it is the secondary coil. The secondary coil normally has hundreds of times more turns of wire than the primary coil.

Current flows from the battery through the primary winding of the coil.

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The primary coil's current can be suddenly disrupted by the breaker points, or by a solid-state device in an electronic ignition.

How to Tell if an Ignition Coil is Bad. You'll want to start by checking for signs of bad ignition coils, and then follow up that diagnosis by testing the coils with a multimeter. Ignition coils take energy from the battery (usually 12 volts) and convert it to a high enough voltage (50,000 volts or more) to create a spark.

If you think the coil looks like an electromagnet, you're right -- but it is also an inductor. The key to the coil's operation is what happens when the circuit is suddenly broken by the points. The magnetic field of the primary coil collapses rapidly. The secondary coil is engulfed by a powerful and changing magnetic field. This field induces a current in the coils -- a very high-voltage current (up to 100,000 volts) because of the number of coils in the secondary winding. The secondary coil feeds this voltage to the distributor via a very well insulated, high-voltage wire.

Finally, an ignition system needs a distributor.

Your vehicle’s sends an electrical signal from the computer to your spark plugs. A can result in a number of problems, such a stalled vehicle, rough idling, or vehicle failure just to name a few. Is a relatively simple and inexpensive process. Part 1 of 1: Replacing an ignition coilMaterials Needed. Screwdrivers. Service manual specific to your vehicle. Socket set and ratchet.

WrenchesStep 1: Disconnect the battery. Disconnect the negative battery cable to cut power to the vehicle. Use a socket or wrench to disconnect the clamp bolt holding the cable to the terminal. Tip: Always disconnect the battery when working on electrical systems of any kind.Step 2: Locate the ignition coils. Locate the ignition coils on top of the engine. They will be attached to the engine block or surrounding components.Step 3: Disconnect and remove the old ignition coil. You will need to disconnect the bolts or screws attaching the coil to the vehicle.

You will also need to disconnect the electrical connectors from the coil.Determine which connection needs to be broken first depending on your particular make and model.On some vehicles, the electrical connections need to be unscrewed or unplugged first, while on others, you will need to unbolt the unit before you can disconnect the electrical connectors. You can refer to your vehicle’s service manual to determine the proper procedure for your particular car. Tip: Ignition coils which run multiple plugs from one coil will have multiple electrical connections to remove. Be sure to mark or label these connectors for reassembly. You MUST reattach the wires to the correct corresponding connections on the new coil.Once the old coil has been disconnected, you can remove it from the vehicle.Step 4: Install the new ignition coil. Install the new ignition coil in reverse of the order in which you disconnected the old one.If you previously disconnected the electrical connectors first, reconnect them last after securing the mounting bolts or screws. Tip: If you had to label multiple electrical connections when removing the old coil, make sure you are reconnecting these wires to the proper terminals on the new coil.Step 5: Reconnect the battery.

Reattach the negative battery terminal to the car battery to restore power to the vehicle.Hand tighten the electrical connection, and then use a socket or wrench to tighten down the terminal bolt. Warning: Never over-tighten the bolts. This could cause damage and replacements are often hard to find. You want to tighten the bolts just enough so that any engine vibration will not loosen them.Once the replacement is complete, close the hood.Step 6: Test the new coil.

Start the engine with the vehicle in park to test the new ignition coil. If the vehicle starts and idles normally, you can then test drive the vehicle.Ignition coil failure can cause one or more cylinders to misfire which can result in driveability issues. By following the above guide, the stressful stuttering and sluggish nature of a malfunctioning coil can be resolved with minimal expenses and in a short amount of time. However, if you find yourself in need of assistance, or you would simply prefer that a professional perform this repair, you can always have one of the certified technicians at YourMechanic come to your home or office to for you.