Read here
[ http://www.twinturbo.net/nissan/300zx/forums/main/view/1117984/Unplugging-the-02-sensors-made-it-idle-smooth.html ]Watch here
https://www.youtube.com/watch?v=IyZZfkMuLmI and here
https://www.youtube.com/watch?v=bqzJY3DlHdM The narrow band sensors only work in a very narrow range, about half a point either side of 14.7 So when the program is more than a point off, the narrow band sensor will not offer much help. At low flow the sensor is useless if the program is not VERY close.
If the AIV is on and the car does not have functioning AIV, the program will add about 10% more fuel, no way the narrow band can compensate for that at idle. The AIV system would fail within 1 to 2 years due to water condensation killing the system, so after the cars were 1 or 2 years old, they all ran too rich at idle, the idle feedback system would not work once the AIV system failed. Nissan dis-continued the AIV system because it was a huge failure. These cars are 25 years old, no way Nissan could have predicted the fuel would be so different today, they also would not have had a way to compensate with narrow band sensors. Today's wideband sensors and modern ECU's offer much more compensation.
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