GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Those with Narrow Band O2 autometer

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Old Feb 10, 2008 | 05:08 PM
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traffic142's Avatar
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Those with Narrow Band O2 autometer

I hooked it up following the instructions of our much vaunted install guru's. Worked and I never left the garage, but after it warmed up, it never got above 7 oclock lean position. Will that change if you actually drive it some (boy that is a concept huh).

Thanks to all those who pm me or emailed me with the help and support.
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Old Feb 10, 2008 | 05:20 PM
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In open loop (startup until several conditions are met), the O2 sensor voltage should remain relatively constant, given normal operating conditions. Once in closed loop, the voltage will oscillate back and forth with the crossover point being 0.450 volts. This is stoichiometric ratio (14.64:1 is what Ford uses). If voltage doesn't oscillate, lean / rich / lean, etc., one possibility is a lazy or defective O2 sensor. With a narrow band gauge, you'll only be able to read one O2 sensor. Maybe try connecting it to the remaining front sensor to see if the result is different. This will conclusively tell whether it's the sensor or the gauge.
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Old Feb 10, 2008 | 06:48 PM
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I used slots 5 & 13 on the passenger side kick panel fuse box. I went to check on it and it is (O2 sensor) is still showing 1 yellow bar at the very top. It should not have any power? is this residual?

As for the initial readings, it could have been the following.....

This is hooked to the PCM on the purple, green wire. Autometer did not have the wire long enough, so I had to add some feet of a 16 guage addition.
Also, I never really warmed up my sensors. I have LT headers so the O2s are down the ways a bit.
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Old Feb 11, 2008 | 05:54 PM
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Ok, I got it to work today. Works fine, had the wrong fuse spot chosen. Very Pleased.
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