How to Change a Faulty Ignition Coil

The ignition coils focus on converting low 12-volt current into a much higher voltage to ignite the fuel and start the engine. A failing ignition coil may cause engine misfires or even the engine not to run.

Surely you can replace a faulty ignition coil at home in a few hours with common hand tools, but please always keep in mind to disconnect the battery when working on electrical systems of any kind.

Here are the steps for replacing a failing ignition coil:

1. Prepare all the tools and materials needed first;

2. Ensure that the new ignition coil is as the same design as the old one;

3. Cut off power from the car’s battery. Disconnect the negative battery cable to cut power;

4. Locate the ignition coil which needs to be placed on top of the engine;

5. If there are more than one ignition cable, label the cables running into the coil, and disconnect each cable attaching into the coil. If there’s only one cable attaching to the ignition coil, just need to disconnect that one. Then you need to tuck the disconnected cables behind the coil or nearby so as to easily access the ignition coil;

6. Remove the old ignition coil. You will need to remove the bolts and screws attaching to the coil, and remove the electrical connectors from the coil as well.

7. Install the new ignition coil:

A. Slide the plug into the side port of the ignition coil until there is a click sound. But please don’t force the connection;

B. Plug each labeled ignition cable into the coil orderly;

C. Reconnect the negative battery terminal to the car battery and the positive cable should still be in place;

D. Start the engine with the vehicle to test the new ignition coil.

If you are still not sure how to replace an ignition coil, maybe you can simply ask a professional technician to help you change the bad ignition coil.

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