I received my Nelson tune for my 2000 GMC yesterday and worked on it from 6-11:30 last night and could not get rid of the PO1631 which is wrong theft code. My mechanic brought his scanner over and we preformed the relearn 6 times and the truck would only start for a quick second and die. Put stock computer back in and it fired up. I called it a night as I get up at 4am to go to work.
Called Nelson and they advised me that they have never had a problem with the relearn and I should do it again. I have done the relearn another 3 times and still get a no start issue. Anyone else have this problem or have any advice to shed on this issue?
Thanks in advance........