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Old 07-07-2003, 03:06 PM   #1 (permalink)
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shadow tree tuning using O2 sensor

Hi:

Is it a good idea to fit an O2 sensor to the exhaust and take its readings witn an Ohmeter while tuning up the carb?.

Comments are welcome,
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Old 07-07-2003, 08:02 PM   #2 (permalink)
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It can be done.
Get an O2 sensor that is heated ( 4 wire )
search the web , you can find write-ups on how to do it.
One thing to remember is that they only measure oxygen, not unburned fuel.
All said , I think that for the price they make a good tool for fine tuning.
good luck
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Old 07-07-2003, 08:23 PM   #3 (permalink)
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O2 sensors are like a small battery. The difference between oxygen in the exhaust and oxygen outside the sensor cause it to produce a voltage.

.1 volt is lean

.9 volt is rich

.45 is centerline (about 14.7:1 air/fuel ratio)

They don't produce a voltage unless they are hot, so get a heated one.

Also note that 14.7:1 is a cruise ratio. A computer ignores the O2 sensor during acceleration or deceleration.
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Old 07-07-2003, 09:00 PM   #4 (permalink)
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Yep...keep in mind they're very much steady-state devices. Which means that data you're seeing happend along time ago (engine-speak).
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Old 07-08-2003, 11:12 AM   #5 (permalink)
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One thing to keep in mind here is that an O2 sensor is a voltage device, I.E. it puts out a voltage while operating. Hooking a ohmmeter to it will usually blow them up. They do not like voltage applied to their sensor wire.
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