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      11-22-2021, 08:35 PM   #1
M5D
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6 new coils and now misfire(s)!

I changed all the coils, now I have a check engine light with misfire or fires! My plugs are new and were installed a couple of months ago. I did not have the new coils at the time. I changed the coil has preventive care. I thought if you changed them all there should be no issue. Any thoughts? Thank you!

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      11-22-2021, 09:11 PM   #2
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Quote:
Originally Posted by M5D View Post
I changed all the coils, now I have a check engine light with misfire or fires! My plugs are new and were installed a couple of months ago. I did not have the new coils at the time. I changed the coil has preventive care. I thought if you changed them all there should be no issue. Any thoughts? Thank you!
Pull the plugs and examine them. Check the gaps, look for cracked ceramics, or one looking different.

Are you using Bootmod3 so you can read code details?

Stock or tuned or what other changes?
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      11-22-2021, 11:51 PM   #3
M5D
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Quote:
Originally Posted by TopJimmy View Post
Pull the plugs and examine them. Check the gaps, look for cracked ceramics, or one looking different.

Are you using Bootmod3 so you can read code details?

Stock or tuned or what other changes?
Okay swapped coil 3 and 4 with the previous ones and she fired right up, cleared codes! So, two of these new factory coils were duds! WTH!
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      11-23-2021, 07:56 AM   #4
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Good save!
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      11-23-2021, 09:36 AM   #5
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Good save!
Thank you for your suggestions! I appreciate it! I still don't understand how two new factory coils could be DOA! These are delphe (sp), not bosch.
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      11-23-2021, 04:22 PM   #6
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Good save!
I talked to the dealer and they said it is not unusual that new coils are bad from the factory... ..WTH! I think I need to get Bosch, not delphe when I changed them again in 100k!
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      11-23-2021, 09:58 PM   #7
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Great post, I’ll remember this when it comes time to replace my coils. Brand new duds, very surprising
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