I have a 2001 LS1 Stroked to 408 with 1 3/4 inch headers with open exhaust no mufflers. The engine overfuels a lot ( black smoke clouds ) under quick/hard acceleration.
My tuner informs me that the O2 sensors are registering .1 volt to low ( .841 volts at WOT) on avarage and that the computer now assumes that the engine is lean and compensates by overfueling.
The 02 sensors are located in the middle of the collectors
He has tried to retune the car app 5 time and still no joy , he is using EFILive .
Is there any way that we can change the 02 readings , maybe aftermarket sensors or do I buy efilive and try myself with the help of efilive forum.