Recognizing Tert Fi influence has been a huge exercise for me. I spent a good part of last year in a real funk- actually the last 2 years when I think about it, and a lot of it was related to me not listening to my feelings. Before that, I took a very logical approach to a lot of matters, and it worked- even relationships-well it didn't work there. :/ But within the last 2 years- changing jobs, my first 'serious' relationship, loss of my gmom, and cutting ties with people who I would give my last for- I've learned to sit back and analyze, and really listen to how I feel about events in my life, and learn that it's okay to act on them, because they are just as valid, if not more, than logic.
So the impact of Fi in an IxTJ, at least the way I see it, is progressive, but takes some effor to reign it in.