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massmike massmike is offline
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Join Date: Apr 2025
Posts: 24
Quick update here. I have read each comment and the links that have been posted. With what I read I understood that I could adjust mixture using the duty cycle of the FV, so I attempted this yesterday. What I found was the duty cycle was very inconsistent, One moment it would be 30%, then jump to 90% and then back to default at 48%. I made a small jumper wire (inserted between O2 sensor and O2 plug) to read voltage of the O2 sensor, it was rock steady at approximately .5Vdc. From there I removed the oil tank cap to simulate a lean condition, O2 voltage only dropped .05Vdc, which didn't seem right. I then removed the O2 sensor from the car to bench test. Volt meter attached to the O2 wire and the sensor body, heat applied to the sensor tip with a small torch. During the first test the voltage came up after 30 second of heating to around .6Vdc but was extremely slow to react when the torch was moved off and on of the tip. During the next test the sensor failed to produce more than .08Vdc even after 2 min of heating. I have concluded the oxygen sensor has failed, even though it was a brand new Bosch. A new sensor has been ordered.

https://youtube.com/shorts/d2Nzejd7XoA?si=PT97gxWynTyQakP2
Old 10-27-2025, 10:11 AM
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