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Originally Posted by Wavey
Related question then - if the O2 is providing readings to the DME that are completely out of range, does the DME ignore that signal and go to a default?
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I have to assume, although I don't know the technical spec of the DME, that at some point the DME defaults into a mode that is no longer dependent on input from the O2, just like when you unhook the O2 sensor. And, the DME works to lean out the mixture, if you're running lean already the DME can do nothing to richen it.....
Wait, I found it in the "Idle Bounce" thread...
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Originally Posted by Scarceller
You should always set on rich side 14.2 because the O2 sensor circuit is really designed to lean out mixture not richen it. Also the spec says 0.8% CO which is equal to 14.2AFR. I'd use the 14.2 or even 14.0 as the base setting then let the O2 sensor pull it lean when in closed loop. I also found most of these cars like to idle better when on the rich side with the base mixture.
Then the other school of thought is that if the O2 fails they usually go open circuit and this is like not having an O2 sensor installed so to be on the safe side you rather run rich than lean.
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Brad and Don, I was getting slow/intermittent response from my O2 sensor last year so I tried the heat/ cold water method of flaking off the carbon buildup, which worked nicely, but it killed the O2 sensor in the process! Ooops. Then when I bought a new O2 sensor I was getting dead-on reliable readings from it and the voltmeter. I am very suspect of the way Wavey's O2 sensor was behaving yesterday.