Pontiac uses both a distributor ignition system (DI) and a distributorless ignition system (DIS) in the Bonneville. The system used depends mainly on the year Pontiac manufactured the car. Both systems utilize a Bonneville ignition coil to generate combustion by converting low-voltage power from the battery into a high-voltage spark that triggers the spark plugs.
Disconnect the ground battery cable. This cable connects to the negative terminal post on the battery. Isolate it to prevent injuries and accidents.
Access the Bonneville ignition coil. On the 4.6L engine, you need to take off the fuel injection sight shield, separate the ignition coil cover from the cam cover on Bank 1, detach the secondary air injection (AIR) vent solenoid electrical connector and remove the check valve for the AIR. If you need to access the ignition coil on Bank 2, take off the upper filler panel.
Detach the ignition coil wiring harness and electrical connector from the ignition coil.
Use a wrench or a socket set to remove the bolt that secures the Bonneville ignition coil in place. If you need to remove all the ignition coils, remove the main coil wiring harness.
Separate the ignition coil from the mounting system. Pull out the old ignition coil and replace it with the new one.
Check that the ignition coil forms a tight seal with the spark plug seals.
Reassemble the components. If you have a torque wrench, tighten the ignition coil retaining bolt to 89 inch pounds (10 Nm) torque.
