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Old August 17th, 2004, 11:01 AM   #1
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Installing air/fuel gauge

I am looking at installing an air/fuel gauge here in the near future. I want to get a good baseline established so that I can monitor things once the mods start (unichip!!??). I know to use a good ground, and how to tap a power source, but Im unsure about connecting to an o2 sensor. I know its best to solder them, but which one do I need to use? I believe we have like 4 of them or something crazy. Any advise is appreciated.
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Old August 26th, 2004, 11:41 PM   #2
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Originally Posted by blu6speed
I am looking at installing an air/fuel gauge here in the near future. I want to get a good baseline established so that I can monitor things once the mods start (unichip!!??). I know to use a good ground, and how to tap a power source, but Im unsure about connecting to an o2 sensor. I know its best to solder them, but which one do I need to use? I believe we have like 4 of them or something crazy. Any advise is appreciated.
The precat sensors--sensor 1 of banks 1 and 2--are wide-band (0 to 5 volt). Narrow-band gauges will not work. In fact, no wide-band gauges seem to work either. It appears that the PCM measures a current instead of a voltage. If you tap into the sensors, you will screw up the current that the PCM relies on to regulate the AFR. Typical narrow-band sensors measure voltage and you can tap into them. In a parrallel circuit, voltage remains the same, but current will split. Some good news, though. The Oz sensors after the precats--sensor 2 of banks 1 and 2--are narrow-band. If you just want to monitor AFR, you can use the typical narrow-band guages like Autometer's. This should give you a reliable AFR indication. With the widebands making the primary AFR adjustments, I'm guessing that the readings from the narrow-bands' AFR guages will read rock steady most of the time, instead of the typical rich/lean cycling light show on the "older" engines. As far as installation, just follow the directions with the gauges. They are fairly simple and straightforward. My advice is to tap into the input wires to the PCM. That way, you stay out of the engine bay completely.
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Old August 27th, 2004, 12:02 AM   #3
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awsome, thanks alot!
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