When I got my '88 N/A, it would not pass emissions. The HC and NOx numbers were too high. Found out it was an O2 sensor was not putting out any signal. While the sensor was bad, the car ran fine. No hesitation, and great pick-up. After the sensor was replaced, it passed emissions, but I could not tell any difference in performance. Still no hesitation, and great pick-up. But, I also picked-up 2 mpg.
The O2 sensor is required if you want to keep from running rich or lean.
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