This thread serves as an index for carbon build-up related threads within the B7 A4 sub-section. There is a "megathread" located in the Drivetrain section for an index of all models located here. Feel free to PM me any additions (internal or not). I can also index any model specific information one might have.
I've tried to tag content as much as possible. With either PICS where there is photographic evidence or CONCERN where there is discussion surrounding concern of the issue.
A4 specific threads:
Carbon Build up cleaning?? CONCERN
Carbon Buildup PICS
BG44k for controlling carbon buildup ... CONCERN
Carbon Buildup ** tech start, not whining CONCERN
Carbon Build Up - 2008 Audi A4 3.2L EXPERIENCE
Audi = carbon buildup?!? CONCERN EXTERNAL
Need input / carbon buildup on intake valves EXPERIENCE EXTERNAL
2.0T FSI Carbon build up. PICS EXTERNAL
Theory on combating carbon buildup: CONCERN
Redline Speed Worx: Cylinder Head Carbon Build Up Sea Foam Service Limitations PICS
carbon build up question CONCERN
Carbon Build Up CONCERN
Shell fuel for B8 2.0T ? CONCERN
2007 Audi A4 3.2FSI - @ 147k carbon/deposit buildup PICS
Anybody that has cleaned their valves, please PM me milage, date, and power perception post-cleaning.
Audi FSI Engine Carbon Build-up Megathread: http://www.audizine.com/forum/showthread.php?t=336352