Hi,
That is a good question. Do me a favor. Switch the new one that appears to be failing with a different coil on the engine. Drive it that way and see if the misfire changes cylinders.
If you switch it with cylinder two and then you get a P0302 (cylinder 2 misfire), the coil is the problem. If the same issue happens as prior (the misfire stays at cylinder 1), we could have a faulty spark plug, a weak connection at the coil connector, low compression in that cylinder, and the list goes on.
Take a look through this link, it explains how to check the system to confirm the proper voltage reaches the coil and how to check if the coil driver is working as designed:
https://www.2carpros.com/articles/how-to-test-an-ignition-system
Let me know what you find.
Take care,
Joe
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Friday, January 10th, 2025 AT 8:16 PM