Hondata

update: checked everything and re-tightened the manifold. AFR is now bouncing around at 16.4 to 16.8
It's in the green. Although I do have the target AFR for low set at 13.5.

Checked gasket. Don't see any obvious cracks or breaks.
Seems to be doing the same thing. runs at 14-15 when warming up then back to 18-20 when is warmed up.

Will do. Let me take everything off and check the gasket.

I Drive 2013 civic si sedan.
I had my setup on Basemap MAF tune.
Adjusted my AF ratio target to 13.5 and adjusted the lamba tables as well.
Car was running just fine. Great even.
Recently I purchased your heatshield and just finished the install last night. I put everything back together and burped ...