Ignition coil pack replacement?

MEGANNELSON1008

MEMBER
2005 CADILLAC DEVILLE
V8
AUTOMATIC
100,000 MILES

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?

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Tuesday, January 28th, 2025 AT 11:22 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
50,162 POSTS

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.

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Tuesday, January 28th, 2025 AT 5:45 PM

MEGANNELSON1008

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4 POSTS

It's a 2005 Cadillac Deville v8 with a NorthStar engine.

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Wednesday, January 29th, 2025 AT 5:52 AM

MEGANNELSON1008

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4 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.

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Wednesday, January 29th, 2025 AT 5:53 AM

MEGANNELSON1008

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4 POSTS

I read somewhere that's it's the original coil pack. That came with the car.

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Wednesday, January 29th, 2025 AT 5:54 AM

KEN L

MASTER CERTIFIED MECHANIC
50,162 POSTS

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.

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Wednesday, January 29th, 2025 AT 8:46 AM