If my 02 sensor is moving back and forth around .5 volts, I wouldn't see a
need for a CO test because your air/fuel mix is correct. Unless there were
other things that did not seem right.

There are lots of related discussions about 02, AFM spring tension, etc,
etc, in the archives recently.

Happy Travels,
Mark Ingalls
85 GL w/digitool and soon to have H-4's controlled by relays. (Thanks for
the instructions, Crew-Cab Ken!)

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