[pjv911]

I know it uses a shielded wire . Could be voltage induction. Full output on a fresh o2 sensor is 1 volt. If the signal wire got a value of 100 mv from static voltage coming from..... lets say a poorly grounded alternator , then your control module will respond to a lean condition (100mv) with a duty cycle change to the frequency valve . The results would be exactely as you described and its not strange at all. Thats why the original pigtail connecter is so insulated. Notice the wire below the tin is unshielded and with barely any insulation . Chances of having static voltage below the tin is unlikely . Get a new 02 sensor and a new pigtail. Otherwise just tuck the signal wire away up by the shock tower(after wrapping it with e-tape of course)

Kurt Williams