Ignition coil pack replacement?

2005 CADILLAC DEVILLE
100,000 MILES • V8 • AUTOMATIC
Avatar
MEGANNELSON1008
  • MEMBER
  • 10 POSTS
I'm trying to change the coil pack for number 2. I took the one off and the one it wants me to replace it with connects from the bottom not the side and the clip doesn't fit in it. Do I have to buy all new coil packs for all of them and a new wiring harness?
Image (Click to enlarge)
Attached Media
Jan 28, 2025 at 11:22 AM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hmm, neither of these coils looks correct, I am wondering if a different engine has been installed? here is what the coils are supposed to look like.

https://amzn.to/4hBXBGP

Check out the images (below). Please let us know what happens.


Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Jan 28, 2025 at 5:45 PM
Avatar
MEGANNELSON1008
  • MEMBER
  • 10 POSTS
It's a 2005 Cadillac Deville v8 with a NorthStar engine.
Jan 29, 2025 at 5:52 AM
Avatar
MEGANNELSON1008
  • MEMBER
  • 10 POSTS
The wiring connector goes in from the side of it and the replacement one they gave me it comes up from the bottom. But it's a different connector because it doesn't fit when I try to plug it in from the bottom.
Jan 29, 2025 at 5:53 AM
Avatar
MEGANNELSON1008
  • MEMBER
  • 10 POSTS
I read somewhere that's it's the original coil pack. That came with the car.
Jan 29, 2025 at 5:54 AM
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
The coils might have been updated, this is what they show in the manual. They may have an updated connector, but you will need to replace all of the coils. I would call the part department at Cadillac to see what they say.
Jan 29, 2025 at 8:46 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.