I have a 16mm hole on the turbo intake pipe where the dump valve was with nothing to block it up so I figured I should disconnect the mass air flow sensor and run it like that for a few days until I get a hose bung. The reason for the hole is because I fitted a fmic with the dump valve relocated to the cold side. But I noticed that the fuel mixture smells a bit off, I'm not worried about it running rich but is there any chance that without the maf connected it might run lean?