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"In your opinion, am I wrong in assuming that the single wire narrow band 02 sensors' black wire (from the sensor to the connector pin) is unshielded ?"
The O2 signal wire was shielded from the factory. Hopefully no one replaced it
with an unshielded wire.
"And, if there is a shielding problem, it is between the pin connection and its path to the ECU ?"
You have to do resistance measurements to determine that.
"I am trying to understand why with a low warm CP (around 2.95 bar) and a .85 V 02 sensor signal (both indicating a rich mixture), the measured duty cycle of the FV is over 80% which as I understand it indicates the ECU trying to react to a LEAN mixture ?"
The duty cycle is not being calculated correctly if the above is true, or the Lambda
ECU is bad, very unlikely though. Check the previous posts.
"One thought I had was that the high 02 voltage was somehow being attenuated on its path from the connector to the ECU, and telling it to further richen the mixture ?"
Unlikely.
"If I checked the connection at the ECU at the appropriate pin (number ?), should I be getting that same .85 V ? If not, and it is lower than .5 V, this would explain the inconsistency right ? I could then focus on that critical path."
As mentioned before, the O2 sensor input to the ECU is pin 2. You should measure
the same voltage there as at the sensor.
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Dave
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