04-03-2023, 12:44 PM | #1 |
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Spark Plug Help
Does anyone know the correct gap for OE Spark Plugs? Stock 2012 650i. I have found several different answers. I've seen .032, and .020-.024. Chasing a misfire fire issue, so I am starting with new coils and plugs. Any other advice/assistance would be great. Car has 95k on the clock. The misfire is in Cyl 8.
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04-03-2023, 01:41 PM | #2 |
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You'll find some discussion of narrower gaps with tuned engines, but if you just buy the correct OEM replacement NGK plugs (I'm assuming 2012 used NGKs as opposed to Bosch) they will come correctly gapped. Just install them. I'm pretty sure it's .032.
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04-03-2023, 01:47 PM | #4 |
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04-03-2023, 02:05 PM | #5 |
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You are correct it cannot hurt to replace all, and I would, but it would also tell you if you are on the right path to correct the problem before you even start.
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04-03-2023, 03:42 PM | #6 |
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I recently replaced all of my plugs and coils on my 2015 650i GC. It was .032 for mine, and I went with the step colder plugs to prepare for BM3...
Still waiting to do the tune, but my misfire went away with the plugs and coils. |
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04-05-2023, 11:46 AM | #9 | |
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Quote:
When reading through the service plan, it mentions about Air Supply being a cause of fault. I wonder if I put a mass air flow sensor in backwards? When I had the stock intakes out, I replaced them with ARM intakes. |
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04-05-2023, 01:54 PM | #10 |
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At least on stock intakes I doubt the sensors can be installed backwards, but I also sense you'd get a more specific code. Maybe not. But if these codes were not present before you started then it may well be something you did.
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