The can is an '86 Monte Carlo LS with a 305 and computer controlled Quadrajet (TPS + MCS). The O2 sensor reads at idle -2000 RPM ~.04v - .07v. I don't know if that is incorrect or not, but my feeling is that it should be reading higher given the sensor has a range of 0v - 1v. If I pump the throttle several times very quickly it will read .9v - 1v, which is correct. At idle and a raised RPM when it reads under .1v the mixture is definitely rich. It smells pig rich out the exhaust, and with the sensor disconencted while I was testing it even smoked a bit from being rich. The car does run a bit smoother with the sensor plugged in though and doesn't smell as rich. Either the sensor is reading false lean and the computer is compensating by richening it up or the carb is not adjusted properly. I have gone through the carb and it should be very close.
Is the sensor bad?? It looks like with the rust it's gonna be a pain to get it out. I'm afraid I'll strip it or something. In any case, what should the O2 sensor be reading for a normal mixture and for a somewhat rich mixture and is my sensor bad?