" Made some progress. After researching and finding that the TC may be the issue I tried to figure out how that applied to my car......Alpina Flash!

Removed the flash today and the surging is 100% gone!

I don't think this is an issue with the Aplina flash, probably more so an indication that my TC might be headed south soon.... "

" Thanks Terry. I might have to take you up on this.

I still need to take my car back to the dealer to fix the stuff they failed to take care of on the previous two visits, but I did a bit more research and I think I may have two, unrelated issues.

The AFR issue I think will end up being related to the O2 sensors and hopefully replacement of both will fix that issue.

The surging issue may be related to the Torque Converter. Similar symptoms have been reported on the Audi forums and many of their cars share the 6AT in the 335i. Without codes it will probably be impossible to convince the dealer to replace it. Also a bit of a pricey part to blindly replace hoping it will fix the issue. I will probably flash the trans back to a stock config to see if that has any impact on this issue, but I doubt that it will. "

" Car has been acting weird ever since it came back from the dealer for new turbos, injectors, HPFP, etc. See THIS THREAD for one issue that has popped up.

The car is currently stock except for Cobb Stage 1 Drive map. In addition to the issue noted above the car seems to be falling on its face after a 2-3 gear shift with moderate to heavy acceleration. Car does not neet to be WOT to get it to happen and it generally happens more often when I shift before redline (car is a 6AT)

When I accelerate in 2nd gear and then shift to 3rd before redline the car just falls flat, stumbles for a bit and then picks up. It feels like a misfire or knock but I don't get a check engine light and there are no codes.


I tried the capture it in a datalog but it of course wasn't as pronounced as a few prior ones.

Datalog #5 is probably the closest but still nothing like when I tried to get on the freeway earlier in the day. (Can't figure out how to post CSV files ) "