What is an ignition coil?

The coil is the part of a car’s ignition system that takes the battery’s 12-volt output (called low-tension current) and transforms it into as much as 45,000 volts (called high-tension current) before then supplying it to the engine’s spark plugs. It is typically just a wire wound transformer filled with an insulator.

Community discussion on the forums.

Tools needed for this job:

Step 1

  1. Disconnect the negative battery cable from the vehicle
  2. Label and Remove all plug wires from the coils (firing order can be found below for the 3800 and the 60° V6)

Step 2

  1. Using the 5.5mm Socket, remove both screws from each coil pack
  2. Using the 7mm socket, unscrew the connector from the bottom of the module (60° V6 just have 3 plugs)

Step 3

  1. Using the Electronic Cleaner, spray the top and bottom of the coils where they connect to the wire and tabs, clean using the copper brush.
  2. Using the Electronic Cleaner again, clean the connections on the module at the point where the coils connect and the connector(s) itself.
  3. Using the Electronic Cleaner one last time, clean the connector(s) from the engine harness.
  4. Let dry.
  5. Once everything is dry, apply the Di-Electric Grease to all connections, coils top and bottom, module connector(s) and plug boots.

Step 4

  1. Reinstall the module on the vehicle
  2. Reinstall each coil
  3. Plug in all connectors and wires as they were before removal
  4. Clean the area of any extra Di-Electric Grease

2.8, 3.1 & 3.4 Firing Order

3100 & 3400 Firing Order

3800 Firing Order

Coil Packs