Just installed my new wideband in my 2007 Z06. I wired the positive and ground directly to the battery and added a switch to the positive wire. Then I attached the ground and signal wire to the HPtuners box. I was pleased to find that the box matches HPtuners, but it's reading about 0.85 lambda at idle. At cruise it reads 1 and if I give it a little gas at idle (1000+rpm) it also reads 1. WOT also reads what I expected. Any idea why it would be reading so rich at an idle of around 800 rpm?
I'm wondering if it's because I have the wideband directly after my cat on the drivers side. Unfortunately, there was no room to put it in front of the cat, but I could remove my narrowband and use that.
When it reads incorrectly, fuel trims are good and commanded lambda is 1.
I'm thinking it probably isn't a calibration issue since I would think it'd be off across the board, but I'm not sure. It just really seem like it's not reading properly when the exhaust flow is low.