6 months ago my friend programmed my computer to go closed loop with O2 sensors only at 290 degrees, I wanted to be open loop all the times for performance reasons. Now I intalled new O2 sensors and want to save some money on gas, but my engine will never reach 290 degrees. What would be the easiest way for me to reprogram my computer. I do have a cable that connects from inside the car for scanning purposes.

 

The easiest way, is to purchase Tunercat and an LT1 definition file. Then you can start doing your own programming. If you're not into that. Then get ahold of Ion at www.madz28.com. Maybe he can do a tune for you and you can load it yourself.