Lean for ~30 seconds after start up

[fastslvblkcar]

I am running a 6.0L with the Honey Badger cam. I have upgraded the springs, push rods and lifters. I have 34lbs injectors, a TBSS intake and shorty headers. When I start the engine, It runs great until about the 23 seconds then it starts into the lean condition. It will migrate up to 1.25 lambda and the engine will have some surge. around 55 seconds of engine run time it will go back to normal. I have tried adjusting some things (Fuel Mult stage 1 and 2, and base running idle air flow to name a few) but nothing has brought this back to where it should be. I am not sure what is changing for that ~30 seconds and where to adjust. I have included a few logs of startup so you can see and my current tune. This is a speed density tune where I just failed the MAF. This is not a speed density OS. Where do I adjust next?

[blindsquirrel]

Is this a catalyst test/post O2 test thing? On Gen3s there is no way to disable those in the tune so it's always best to leave the rear O2s plugged into the harness but just tied up somewhere out of the way.

[fastslvblkcar]

Is there a way to add fuel at that point to reduce it? I removed the rear sensor wiring 2 years ago when I installed this setup and no longer have the old stuff. and it is too much of a pain int the butt to remove the harness and install the sensors and connectors. Looks like I might just have to deal with the lean condition.

[GHuggins]

You can sometimes help it with the afterstart enrichment multiplier tables under open loop.