What is an ignition coil?
The coil is 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 supplying it to the engine’s spark plugs. It is typically just a wire-wound transformer filled with an insulator.
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Tools needed for this job:
- 5.5mm Socket
- 7mm Socket
- CRC QD Electronic Cleaner
- CRC Di-Electric Grease
- Soft copper wire brush
- New plug wire set is recommended for best results
Step 1
- Disconnect the negative battery cable from the vehicle
- Label and Remove all plug wires from the coils (firing order can be found below for the 3800 and the 60° V6)
Step 2
- Using the 5.5mm Socket, remove both screws from each coil pack
- Using the 7mm socket, unscrew the connector from the bottom of the module (60° V6 just have 3 plugs)
Step 3
- 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.
- Using the Electronic Cleaner again, clean the connections on the module at the point where the coils connect and the connector(s) itself.
- Using the Electronic Cleaner one last time, clean the connector(s) from the engine harness.
- Let dry.
- Once everything is dry, apply the Di-Electric Grease to all connections, coils top and bottom, module connector(s) and plug boots.
Step 4
- Reinstall the module on the vehicle
- Reinstall each coil
- Plug in all connectors and wires as they were before removal
- Clean the area of any extra Di-Electric Grease
Firing Order
2.8, 3.1 & 3.4 Firing Order

3100 & 3400 Firing Order

3800 Firing Order

Spark Plugs
2.8 V6 & 3.1 V6
- ACDelco Copper Part # R44LTSM
- Autolite Copper Part # 5245
- Plug Gap 0.45
3.1 Turbo Vin V
- ACDelco Copper Part # R42LTS
- Autolite Copper Part # 103
- Plug Gap 0.45
3.4 DOHC V6
- ACDelco Iridium Part # 41-993
- Autolite XP Iridium Part # XP5243
- Autolite Copper Part # 5243
- Plug Gap 0.45
3100 & 3400 V6
- ACDelco Double Plat Part # 41-940
- Autolite Copper Part # 606
- Plug Gap 0.60
3.6 DOHC V6
- ACDelco Iridium Part # 41-109
- Autolite XP Iridium Part # XP5263
- Autolite Platinum Part # AP5263
- Plug Gap 0.45
3800 N/A
- ACDelco Double Plat Part # 41-902
- Autolite Platinum Part # AP606
- Autolite Copper Part # 606
- Plug Gap 0.60
3800 SC
- ACDelco Double Plat Part # 41-902
- Autolite Platinum Part # AP606
- Autolite Copper Part # 606
- COLDER Autolite Copper Part # 104 & 103 (Requires Tune)
- Plug Gap 0.60
Wire Sets
2.8 & 3.1 V6
- Delphi / Wireset Part # XS10206
- ACDelco / Wireset Part # 9706R
- Duralast Gold / Wireset Part # D801163
2.8 & 3.4 DOHC V6
- Duralast Gold / Wireset Part # 4877
3100 & 3400 V6
- Delphi / Wireset Part # XS10226
- NGK / Wireset Part # 51107
- Duralast Gold / Wireset Part # D801096
3.6 DOHC V6
- NGK / Boots Part # 58984
- Duralast Gold / Boots Part # 90098
3800 V6
- AcDelco / Wireset Part # 9746BB
- NGK / Wireset Part # 51031
- Duralast Gold / Wireset Part # D801110
Coil Packs
Std Emotec Coil Packs:
Gray Bottom
Low voltage side (Bottom)
- 0.9
- 0.9
- 0.9
- 0.9
- 0.9
- 0.8
- 0.9
- 0.9
- 0.9
High voltage side (Top)
- 5800
- 5680
- 5750
- 5800
- 5800
- 5700
- 5810
- 5800
- 5700
L67 Coil Packs:
Blue Bottom
Low voltage side (Bottom)
- 0.8
- 0.9
- 0.9
- 0.9
- 0.9
- 0.9
- 0.8
- 0.9
- 0.9
High voltage side (Top)
- 5640
- 5730
- 5750
- 5800
- 5800
- 5750
- 5800
- 5800
- 5750
MSD Coil Packs:
Gray Bottom
Low voltage side (Bottom)
- 0.8
- 0.8
- 0.8
High voltage side (Top)
- 5660
- 5640
- 5790