How To Change An Ignition Coil: 15 Steps (with Pictures) - WikiHow

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1 Connect the plug into the side of the ignition coil. Slide the plug into its port on the new ignition coil until you hear the release click. If you don’t hear a click, it means the connector isn’t pushed in far enough and the coil may not function.[13] X Research source
- If you don’t hear a click, pull the connector back off and look inside it to make sure there’s no debris in the way. Then try again.
- Don’t force the connection or you may break it.
2 Plug each ignition cable into the coil using the order written on them. If there was only a single cable running to the ignition coil, press that cable directly onto the new coil’s cable port until you hear it pop on. If there were multiple cables, start with the cable labeled with a number 1, and connect it to the top left port. Then proceed in order.[14] X Research source
- Each cable should produce an audible pop when it’s properly connected.
- You may want to add a dab of dielectric grease to the ports before connecting them to ensure you have a strong connection.
- You can purchase dielectric grease at your local auto parts store.
3 Reconnect the battery. Slide the cable you removed previously back onto the negative (-) terminal of the battery. Use an open-ended wrench or socket and ratchet to tighten the bolt and secure the cable in place on the terminal.[15] X Research source
- The positive cable should still be in place.
- Be careful as you connect the negative cable to the terminal. It may produce a spark.
4 Start the vehicle to test the new coil. Insert the key into the ignition and turn it to start the engine. If the engine does not turn over at all, the battery is not connected or may be dead. If it attempts to turn over but fails to, check the connections on the ignition coil before trying again.[16] X Research source
- Use an OBD-II code scanner to clear any engine error codes. Then allow the engine to run for a few minutes to see if the check engine light begins to flash.
- A flashing check engine light indicates a misfire. Check the connections on your new coil and then try again.