Last Update: January 29, 2023
An ignition coil is a self-contained unit that generates a high-voltage electrical pulse to produce an ignition spark. It contains two separate coils of wire, one inside the other. Mutual induction allows electromagnetic charge to be transferred from the outer coil to the inner coil, making it possible to convert the 12 V current from the car battery into the 10,000 V required to produce a spark. Both coils are embedded in oil to prevent overheating.
There are several signs that you need to buy a new ignition coil. These include misfiring, starting problems, misfiring, stalling, and lower fuel economy. If you are experiencing any or all of these problems, the ignition coil is an excellent place to start. You can test it quickly by running your vehicle for 30 minutes and then gently tapping the component with a screwdriver. If the engine goes out, that’s usually a clear sign that you need to replace your ignition coil.
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How to remove the ignition coil
Fortunately, it’s easy to replace a faulty ignition coil. All you need to do is buy an ignition coil online and follow these simple steps:
- Disconnect the battery. First, disconnect the negative terminal of the battery with a socket. Then repeat the process on the positive terminal, ensuring that the cable does not touch any metal part of the car, as there may be a residual current.
- Disconnecting and removing the ignition coil. Next, you will need to use a small screwdriver to remove the screws that hold the ignition coil in place. These are usually 7 and 8 mm in size. Make sure you put them on a tray to keep them together. It may be difficult to remove the ignition coil depending on the engine type. Try gently twisting it or even pulling it out completely. You should then pull it up and out of the vehicle.
- Install the new ignition coil. Now insert the new ignition coil and secure it with the nuts and bolts. There is often a resistor on one of the screws.
- Reconnect the battery. Finally, reconnect the negative and positive terminals. It is vital to make sure they are connected in the same order as before. Usually, some numbers or markings indicate which cable is connected to which base.
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