I have always thought that when doing a MT swap, you should definitely replace the ECU with one made for the new transmission. Regardless of whether or not you're getting codes, it still isn't made for the MT...it's made for the AT. I don't know if it really effects anything at all, but it certainly COULD.
That's my first thought.
Second thought is those injectors. Maybe you're just getting too much fuel since you have the AT injectors (same concept in my head as the ECU...you have a MT now so should theoretically need the MT injectors instead) Maybe it's the higher flow rate and you're wasting more gas causing more hydrocarbons?
I don't really know...just throwing some ideas out there. What I would try is to find someone with the ECU you need and ask if you can borrow it for a day, see if it makes a difference.
Also hit up a junkyard and get some injectors and see if you can pass with the MT injectors. I would use the injectors just for the inspection, then probably swap the old ones back in (who knows how bad the junkyard injectors are...)
That's my first thought.
Second thought is those injectors. Maybe you're just getting too much fuel since you have the AT injectors (same concept in my head as the ECU...you have a MT now so should theoretically need the MT injectors instead) Maybe it's the higher flow rate and you're wasting more gas causing more hydrocarbons?
I don't really know...just throwing some ideas out there. What I would try is to find someone with the ECU you need and ask if you can borrow it for a day, see if it makes a difference.
Also hit up a junkyard and get some injectors and see if you can pass with the MT injectors. I would use the injectors just for the inspection, then probably swap the old ones back in (who knows how bad the junkyard injectors are...)