Running rich under boost?

Hey team, was getting my 6 retuned and during the retune it started running rich under high boost. We ended up returning to the tune I went in with and it was still rich under high boost and afr are fine when cruising.
Any ideas what would cause my car to be rich under boost? My tuner and I are thinking pcv or injectors? Or maybe a leak somewhere but I have checked all fittings and they are tight but maybe I should try soapy water to confirm if there is a leak? Any help appreciated! Thank you

 

Have you looked for Exhaust leak somewhere from head to primary o2 sensor or perhaps primary o2 sensor is going out.

I would think failing injectors or injector seals or simply dirty injectors would lean towards lean not rich.

 

Check for boost leaks first and then work through the other test such as vac smoke test. It could be a bad exhaust gasket.

Pre-turbo = + trims, air added or sucked in
turbo to TP = - trims, air lost or pushed out
post TP = + trims, air added or sucked in

 

Do a boost leak test. Just like we told you on facebook.