There are 2 methods of resetting the ECU apparently ..disconnecting the battery and pressing brakes for a couple of mins or shorting the fusebox with a wire (according to Nissan workshop manual) .. I'm assuming both methods do the same thing.
What do you mean by lean fuel? AFRs ? I don't think I'm running lean .. I believe my AFRs are about 11.5:1 which is what you tuned it at. I checked the AFRs again about 6 months ago on the dyno and they were still the same.
But as I said, I was getting the crap fuel economy even BEFORE you remapped the ecu ..and remapping didn't change the fuel economy.
Anyway, my question is .. will resetting the ECU erase the AFRs/ignition timing that you tuned ? ie. will I lose my remap tune by resetting the ECU ?