I had my 99 s10 tuned last week running 6psi turbo boost. Its running fantastic with the exception on a slight boog down in the idle when coming to a complete stop. Does it more when it's cold ( stalled on me one moring when it was in the 20's) the guy that tuned it instucted me to install a heated o2 sensor. So I bought an ls1 upstream 4 wire and installed it. Took it back to the tuner and he said that the mili volts are not reading rite so I must have it wired wrong. I swear that's not the case? I tried it his way and it did not read at all. Can anyone confirm what I have please? This is a bosh sensor.
Black wire to o2 signal from factory sensor
White wire to 12v ignition
White wire #2 to ground
Grey wire to ground.
Both grounds on the same stud on fire wall.
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