I have a 99 FLHTCUI I’m having multiple problems with; dead tach, backfiring, low idle, choking off, code i can’t pull through the on / off method, etc, likely all related to the ECM. I’ve replaced the crank position sensor, traced wires, tightened everything I could, cleaned the pins in the ECM, replaced the tach, no luck at all. Had a mechanic look it over, couldn’t find anything. So he increased the idle so I can at least ride it some but I’m scared to go too far.
So I read a little about converting to carb, saw there are some kits available, saw others had complete parts lists, but also read there are some quirks specific to that year that have to be specifically addressed, and I read conflicting things. Also I’m not certain what all else might be left off and not working after that, like anything that is electronically powered through the ECM, like the tach for one.
Just throwing it out there to see if anyone has specific experience with this models conversion. Before I dive into it I’d like to be as informed as I can. I’m no mechanic but I can do some things and figure things out to a point, and I understand that this project isn’t really that hard to DIY. It can’t be any worse than chasing rabbits trying to figure out what’s wrong with the electronics in an EFI Ultra classic