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New O2, now idles rough.... 200

uid 18083's pic
posted by  lucid on  Wed Mar 12 01:19 CST 2008
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

""Digital voltmeter on O2 lead while plugged into computer reads only .05 volts(not .50) all the time."

To me that sounds like a bad sensor, rather than an effect of the ECU "readapting" to anything.

The sensor is basically a voltage generator. The ECU can't influence the sensor directly, just the fuel mixture affecting the amount of voltage the sensor generates. If the sensor is sending an extremely lean .05v signal, the ECU should go extremely rich with the mixture in response. In which case, a good sensor's voltage signal would show a corresponding rise in its voltage output.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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