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Replacement ignition coil insanity (2022 edition)
I could tell I was having some misfires and found them to be accumulating on cylinder #7. No misfires on any other cylinder. I swapped the coils from #5 to #7 and it results in the same issue on cylinder #5 (which should rule out anything specific to cylinder #7 as a potential cause). Plugs recently replaced with NGK OE spec. Plug #7 examined and it looks acceptable.
I order a replacement coil:
Started with CUF2890 / UF597 - about 5 minutes of driving and I get a half-power MIL (RMA in progress)
Autozone branded coil - ditto (returned)
NGK coils (from different sources) both immediately result in a "hard" MIL for reduced power about 2 seconds after the car starts (one distributor refunded me for the part and didn't even want it shipped back)
Napa Echlin - had it brought to local store, it looks like the others, didn't buy it to bother trying it
I have a UF597 from another source on the way Monday but I'm skeptical that it will work, either.
Are there any known ignition coil part numbers that someone has purchased recently that are known to work (aside from $220 or more from BMW)?
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2008 E90 M3 Jerez Black
2007 Mini Cooper S (The Radio-Active Concert Hall)
1993 RX-7 (self fabricated parts/far from stock)
1990 MX-5 turbo (self fabricated parts/far from stock)
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