Question about my LS2

[French Fred]

Hi,
I've swapped one LS2 into my 1968 Camaro. So far, I haven't plugged in the CO2 sensors, and the engine runs well. My question is, may I damage the engine? Should I plug them for better combustion?
Another question is, with the CO2 sensors, is it possible to tune the engine to use E85 fuel, and what must I modify to run E85?
The last question is: when I bought the car, the engine was already done; now which software are you using to tune the engine?
Thank you so much for your help.
Fred

[Lonnies Performance]

To clarify, they are O2 sensors.

If the engine was properly tuned, it will run fine with them disconnected, but the ability to correct for various conditions would not be possible.
Yes, you should plug them in. Without diagnostic abilities, you have no way of proving the tune is good.

Tuning for E85 is not a matter of just putting different fuel in & tuning.
You often (most likely) need larger injectors & possibly a modified fuel system.
.
Also, since E85 is not tightly controlled (Ethanol content varies greatly), so your tune may vary from tank to tank.
The O2 sensors correct somewhat but the ideal way is with a flex fuel sensor that may or may not be compatible with the ECM in your vehicle.

Lots of different tuning software available, but HP Tuners is the most common which makes it easier to share in the knowledge base online.
I would suggest you start doing a lot of research, before investing money in the software to assess your ability to tune your vehicle.
There are lots of good tuners that may be able to set you up for less money than the investment to do it yourself... unless you have multiple vehicles to do.

[French Fred]

Thank you for your answer, I will contact one professional to adjust it and tune it properly because the idle isn't stable.
Fred

[Vimes]

On running E85 they sell flex fuel conversion kits, which is what you will want to add. It will let the car determine how much ethanol is in the fuel, and the computer when loaded with a flexfuel tune will be able to determine where to set the timing according to how much ethanol is in the fuel.

Ethanol is also far more corrosive than gasoline, so your entire fuel system will need to be able to handle ethanol. This may include installing a new fuel tank, fuel pump and all fuel lines and seals in the system as well as the injectors. But, with the right tune it can provide a LOT more power, particularly if you decide to force induce. Converting a running car to E85 would be worth it if the reason is power, but if it's fuel cost it's going to take a lot of driving to reach payback.