hi ppl
ive converted my efi cabby to efi turbo using ofac management but when i took it for a setup it was running massivley lean 0.20 %
the tuner reckons things are working as should but discovered an ecu fault,
so ive changed the ecu and it did make a differance to the drive of the car if a bit sluggish but when he checked it again it is still very lean.
so he checked the flow of the fuel pump and said it wasnt flowing enough so ive just fitted an uprated one from msd and its still the same.
its just sitting around 0.20%

so, any ideas what would cause it to run lean constantly

cheers
mick