Ignition coil pack?

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MNELSON08
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How can I test the coil packs with a multimeter on a 2005 Cadillac deville northstar engine v8 with the coil packs being the white top coils.
Oct 5, 2026 at 8:05 AM
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MNELSON08
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It’s a 4 pin coil packs
Oct 5, 2026 at 8:06 AM
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STRAILER
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I would not rely on a conventional primary/secondary resistance test with a multimeter. These are electronically controlled coil/module assemblies rather than the older simple two-terminal coils. Each coil circuit has ignition voltage, ground, a PCM ignition-control circuit, and a low-reference circuit.
Oct 6, 2026 at 10:22 AM
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MNELSON08
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So how do i test them? This is whats happening im getting a p0300 code random misfire, ive changed the spark plugs already. When starting the car it starts and then it shakes when in idle. It also will die at stop signs when driven. No other show up.
Oct 7, 2026 at 8:58 AM
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STRAILER
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There is not a good way to test them unless you remove one side (4 coils) and test the output. This video can show you how.

https://www.youtube.com/watch?v=1zQQy9noYQ0
Oct 9, 2026 at 3:52 PM
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MNELSON08
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Test each coil output or each side (4 coils)
Oct 13, 2026 at 11:09 AM
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STRAILER
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How did it turn out do all of the coils have spark?
Oct 14, 2026 at 7:13 AM
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MNELSON08
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No I’m askin do I test each coil or the whole rail output
Oct 14, 2026 at 9:59 AM
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STRAILER
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You keep the coil pack connected and check the spark output, did you watch the video?
Oct 14, 2026 at 5:29 PM
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MNELSON08
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Yeah it says unlock the safety lock on the coil pack so I test each connector to the coil pack. The connectors that connect to the top of each coil pack. Then it says to stick paper clips in the connector, how do I know which one is ground? It’s a connector with 4 female parts on it. (4 pin connector)
Oct 15, 2026 at 1:18 AM
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STRAILER
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No, you will be checking he coil output not inputs. Please go over this guide instead.

https://2carpros.com/articles/how-to-check-for-ignition-spark/
Oct 15, 2026 at 8:07 AM
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