I'm having new problem (my first problem), the car now has 19K miles total on it. Here are the symptoms:
1. P0421 code has come up
2. Gas mileage has dropped from 22-24 to 17 -18
3. Tailpipes getting black
4. New Popping sound in exhaust when lifting off throttle
5. Puffs of black smoke when up shifting after accelerating hard.
I'm under the impression that the car suddenly started running rich given the above symptoms , plus I can smell it. I've made no changes to the car or gas used. It was running flawlessly until about 10 days ago, the change was sudden and seems progressive.
I've already data logged and sent the logs to Moto East with payment for an updated tune, that was over a week ago. I've not heard back yet, but I've noticed the above symptoms getting worse throughout the week.
I'm thinking that I'll have to replace the header/cat with a cat-less header and get your extended O2 sensor wire, then get a new tune done.
After this is settled, I'm considering upgrading to the 2.8 pulley but with this issue I have concerns about reliability. How fragile have past cars been with the 2.8 pulley?
One other question, using and reading about EcuTek, I discovered that my car might have more than one map in the ECU. I'm wondering if I'm on the wrong map. In holding the cancel button down the tach shows I'm on map 2. Is that where I should be? Since I bought this used, I don't have ALL of the info, but I was hoping you might have info since it was modified at your place.