- Replacement ignition coil
- Service manual specific to your vehicle
- Socket set and ratchet
Step 1: Disconnect the battery. To turn off the vehicle's electricity, unplug the negative battery cable. Disconnect the clamp bolt holding the cable to the termination using a socket or wrench.
Tip: When working on any electrical system, it is always a good idea to unplug the batteries first.
Step 2: Locate the ignition coils. On the top of the engine, look for the ignition coils. They'll be attached to the engine block or other nearby parts.
Step 3: Disconnect and remove the old ignition coil. You'll need to detach the nuts or screws that hold the coil to the vehicle. You'll also need to unplug the coil's electrical connections. Depending on your vehicle's make and model, determine which connection has to be disconnected first.
On certain vehicles, the electrical connections must be unscrewed or disconnected first, while on others, the unit must be unbolted before the electrical contacts can be disconnected. To discover the appropriate method for your vehicle, see your vehicle's service guide.
- Tip: Numerous electrical connections will need to be unplugged from ignition coils that drive multiple plugs from a single coil. For reassembly, be careful to mark or identify these connections. The wires must be reconnected to the proper connectors on the new coil.
You may now remove the old coil from the car once it has been unplugged.
Step 4: Install the coil. Install the new ignition coil in the opposite order as the old one was unplugged.
After securing the mounting nuts or screws, reconnect the electrical connections if you had disconnected them first.
- Tip: If you have to mark several electrical connections while replacing the old coil, make sure that you reconnect these wires to the correct terminals on the new coil.
Step 5: Reconnect the battery. To restore power to the vehicle, reconnect the negative battery connection to the car battery.
Tighten the electrical connection by hand, then tighten the terminal bolt using a socket or wrench. Close the hood after the replacement is complete.
- Warning: Bolts should never be overtightened. This could result in damage, and another new replacement will have to be purchased. You want to tighten the bolts just enough to prevent them from loosening due to engine vibration.
Step 6: Test the new coil. To test the new ignition coil, start the engine while the car is in the park. You may next test drive the car if it starts and idles normally.