E92 335i Misfire & AFR issues. Help!

[kiwiN54]

Hi Guys!

I’m new to the forums and a first time poster. Im hoping to get a bit of advice on a problem I’ve ran into as beside trawling YouTube tutorials and scrolling on forums I’m fairly inexperienced with the tuning of these vehicles.

Essentially I have had a 29CD code (Cylinder 1 combustion misfire) start popping up over the last few days. Spark plugs were replaced less than 5000km ago and coils checked at the same time. I had the same issue when I first purchased the car (it was and still is, running a third party stage one tune) and changing the spark plugs fixed it so am I right in assuming that now a coil has gone bad? Or do you guys recommend I go to one step colder plugs?

I’ve attached the link to the log of the pull which caused the misfire, is there any chance someone could take a look and let me know their thoughts? I’m also curious about the Bank 1/2 Lambda AFR numbers and why there seems to be such a difference in values. Injectors? 02 Sensors? I’m fairly lost.

Thank you very much
Clayton

https://datazap.me/u/kiwin54/misfire-log?log=0&data=

Mods
VRSF 7.5inch FMIC
VRSF Catless Downpipes
VRSF Intakes
VRSF Chargepipe (stock diverted valves)
Oil Catchcan
98 Octane Fuel & 90000 miles

[pbonsalb]

If your coils are original, I would change them. One sign would be that the car runs fine at stock boost levels, but misfires at high boost levels.