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A lazy oxygen sensor may cause a rough idle or surging while driving on 1989-94 Nissan Maxima models. The lazy sensor may induce a lean running condition. Check the sensor with an oscilloscope, not just a DMM. That way you'll be able to see the MIN/MAX voltage, as well as the sensor's switching time between rich/lean, lean/rich. The sensor may look okay on a DMM, even though it's lazy.
Elliot Harvey
Harvey Foreign Car
Lakeland, Florida
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