Originally Posted by pslsnakes

Depending on how/what that ECU was chipped for, the 02 could have been deleted from the system. Mine is and I'm tuned with eCtune.

Originally Posted by pslsnakes

Also, what was the ECU chipped with? What you could do is take your ECU, cut the jumper pin, and if it stopped, you know it's the tune or base-map on the chip.

Were you actually tuned via dyno or a street tune? Or did you just buy a "chipped" ECU and throw it in your car? I remember when mine was just chipped and I smoothed out the fuel curves I used to pop from the exhaust at idle because I was a little bit lean.