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The new injector was from BMW, my Indy installed it, I’ve used him for a long time.
I need to check the index but it’s coded correctly, I double checked it and also recoded all of them after manually checking them to be extra sure
Coil is brand new OEM Bosch one
Sparks are oem NKG ones specific for this engine
The severity of the misfire now (basically cylinder 4 does not run properly at all even from a cold start) is unusual, in the past simple Misfires are intermittent and not as bad as this, plus the wildly fluctuating STFT on bank 2 positive to negative makes me think there is something significantly wrong rather than the usual coils or injectors
I swapped the new coil for a good one to double check and problems remains so isn’t the coil
The grounds look good
Ima double check the new spark plug tomorrow and swap cylinders
Aside from that plan this weekend is pop intake manifolds off and have a look, I suspect a severely caked valve may be the issue.
When I changed cylinder 4 spark plug it took a lot to get it out; was properly seized in and caked up black
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