How to Change an Ignition Coil

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To change an ignition coil: 1) Disconnect the negative battery terminal, 2) Remove the electrical connectors and mounting bolts, then replace the old coil with a new one. Now let’s dive into the details of changing an ignition coil.

The ignition coil is an essential part of the ignition system in a vehicle. It is responsible for transforming low voltage into high voltage, which is necessary for the spark plugs to ignite the fuel and air mixture in the combustion chamber.

Over time, the ignition coil can wear out or become faulty, resulting in poor engine performance or even engine misfires. In such cases, it is important to know how to change the ignition coil to ensure the smooth operation of your vehicle. We will guide you through the step-by-step process of changing an ignition coil.

How to Change an Ignition Coil


Essential Tools For The Job

An ignition coil is a vital component of the ignition system in a car. When it comes time to replace a faulty ignition coil, having the essential tools on hand can make the task much smoother. Let’s take a look at the tools you’ll need to get the job done right:


A screwdriver is a must-have tool for removing the screws that hold the ignition coil in place. Make sure to choose the appropriate size and type of screwdriver for the job to avoid damaging the screws.


Pliers are essential for disconnecting any electrical connectors or wire harnesses that may be attached to the ignition coil. They provide a secure grip and help prevent damage to the connectors during removal.

Socket Set

A socket set is crucial for accessing and removing the bolts or fasteners that secure the ignition coil to the engine. Having a variety of socket sizes at your disposal will ensure you have the right tool for the job.


Locating The Ignition Coil

When it comes to changing an ignition coil, the first step is to locate its position within your vehicle’s engine. The ignition coil is a crucial component responsible for generating the sparks needed to ignite the fuel in each cylinder. By following a few simple steps, you’ll be able to easily identify the ignition coil in your car and proceed with the replacement process smoothly.

Identifying The Coil’s Location

To begin with, you need to identify where the ignition coil is located in your car. The exact position can differ depending on the make and model of your vehicle, but it is typically found near the engine. Refer to your car’s manual or do a quick online search with the specific details of your vehicle to determine the precise location.

Preparing The Area

Now that you know the general location of the ignition coil, it is time to prepare the area for the replacement. Start by ensuring that the engine is cool to the touch to avoid any burns or injuries. Next, gather the necessary tools such as a wrench or socket set, depending on the fasteners used to secure the coil. Additionally, gather a clean rag or towel to wipe away any debris or grease that may have accumulated around the ignition coil.

Before proceeding, it’s important to disconnect the negative cable from the vehicle’s battery. This step helps prevent any electrical shocks or accidental starts during the replacement process. Make sure to secure the cable away from the battery to avoid any accidental reconnection.

Now, carefully inspect the ignition coil, noting its position and any surrounding components. Take note of the wiring connections leading to the coil, as these will need to be disconnected before removing the coil itself. Also, check for any screws, nuts, or bolts securing the coil in place. Make a mental or physical note of these fasteners so that you can safely remove them when the time comes.

Lastly, clean the area around the ignition coil. Use a clean rag or towel to remove any dirt, dust, or debris that may have accumulated. This step ensures that no foreign substances enter the engine when the ignition coil is replaced.

Removing The Old Ignition Coil

When changing an ignition coil, start by removing the old one carefully to avoid damaging other components. Disconnect the electrical connectors and bolts securing it, then lift out the old ignition coil gently. Remember to handle with care to ensure a smooth transition during the replacement process.

Disconnecting The Electrical Connectors

Disconnecting the electrical connectors is the first step towards removing the old ignition coil. Start by locating the electrical connectors attached to the coil. These connectors are usually made of plastic and are secured in place with a locking tab or latch. To disconnect them, gently press the locking tab or release the latch and pull the connectors apart. Be cautious not to forcefully yank on the connectors as it may damage the wiring or the connectors themselves. Take your time and use a steady hand to avoid any mishaps in this crucial step of the process.

Unbolting And Removing The Old Coil

Once the electrical connectors are safely disconnected, it’s time to move on to the next step of unbolting and removing the old ignition coil. The coil is typically secured to the engine block or another mounting bracket with bolts or screws. Use a suitable wrench or socket tool to carefully remove the fasteners that hold the ignition coil in place. Keep in mind that some ignition coils may have multiple bolts or screws, so make sure to remove them all before attempting to lift the coil out. If you’re not sure about the exact location of the bolts or screws holding the coil, referring to the vehicle’s repair manual can be beneficial. This manual provides detailed instructions and diagrams specific to your vehicle’s make and model, giving you a better understanding of the coil’s mounting points. Take note of any wires or brackets that may obstruct the removal of the coil and carefully maneuver around them to complete the task smoothly. Once all the fasteners are removed, it’s time to lift the old ignition coil out of its housing. It’s important to exercise caution as you lift the coil to prevent any damage. A gentle rocking motion can help loosen the coil from its position, making it easier to remove. Remember to handle the coil with care to avoid any mishandling that could result in damage or injury. With the old coil successfully removed, you’re now one step closer to replacing it with a new one and getting your vehicle up and running again. In conclusion, removing the old ignition coil involves disconnecting the electrical connectors and unbolting the coil from its mounting points. By following the proper steps and being cautious throughout the process, you can ensure a successful removal without any damage to the coil or other components.

Installing The New Ignition Coil

Let’s move on to the next step in the process of changing an ignition coil: installing the new ignition coil. Here, we will cover securing the new coil in place and reconnecting the electrical connectors, ensuring your vehicle is ready to run smoothly again.

Securing The New Coil In Place

To secure the new ignition coil, align the mounting holes on the coil with the corresponding holes on the engine. Use the appropriate bolts to fasten the coil securely in place. Make sure to tighten the bolts evenly to ensure a secure fit without damaging the coil or the engine.

Reconnecting The Electrical Connectors

Once the coil is secured, it’s time to reconnect the electrical connectors. Match the connectors on the wiring harness with those on the ignition coil, and press them together firmly until you hear a noticeable click. This ensures a secure and reliable electrical connection that is essential for proper ignition coil operation.

Testing The Ignition Coil

To change an ignition coil, start by testing the coil with a multimeter to check for continuity or resistance. If the coil is faulty, disconnect the electrical wiring, and remove the old coil. Install the new coil, reconnect the wiring, and test the ignition to ensure proper functioning.

Starting The Engine To Check For Proper Functioning

Before proceeding with testing the ignition coil, start the engine to assess its functioning.

Checking For Any Issues

Ensure there are no visible issues such as cracks, corrosion, or physical damage on the ignition coil.

How to Change an Ignition Coil


Frequently Asked Questions Of How To Change An Ignition Coil

Can I Change Ignition Coil Myself?

Yes, you can replace the ignition coil yourself. It is a relatively simple process that requires basic tools and knowledge. Make sure to follow the manufacturer’s instructions and take necessary safety precautions. Always consult a professional if you are unsure or uncomfortable with the task.

What Tools Do I Need To Change Ignition Coil?

To change an ignition coil, you will need the following tools: a socket wrench, a spark plug socket, a screwdriver, pliers, and a new ignition coil. These tools will help you remove the old coil and install the new one.

How Long Does It Take To Replace An Ignition Coil?

Replacing an ignition coil usually takes about one to two hours. It may vary based on the complexity of the job and the type of vehicle.

Can You Replace Just 1 Ignition Coil?

Yes, you can replace just 1 ignition coil if it’s the only faulty one, saving time and money.


Changing an ignition coil is a straightforward task that can improve your car’s performance. With the right tools and a little know-how, this DIY project can save you time and money. By following these simple steps, you can ensure your vehicle runs smoothly and efficiently.

Keep your car in top shape and enjoy the benefits of a properly functioning ignition system.

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