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O2 sensor
Posted by Bill S. [Email] (more from Bill S.) on Sun, 24 Oct 2004 14:25:01
In Reply to: Emissions - one last time, Doug D, Sun, 24 Oct 2004 07:14:24
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When you say your O2 sensor is fluctuating, what values are you seeing? Measuring between the signal wire (the single black one, typically) and a good ground, with the wire connected to the circuit, you should see values centered around .5V, maybe .3-.7 or so. Low voltage = lean; high voltage = rich. You can tweak this by turning the adjustment screw on the AMM, but you should only do it once you know everything else is ok (e.g. no vacuum leaks, etc).
I believe that your very high NOx readings indicate a lean mixture, also I don't think CO increases significantly in the lean range (but it does in the rich range). Does your O2 sensor agree (low voltage)? If not, it could be the problem. One time I saw a car that indicated rich running via the tailpipe sniffer, but the O2 sensor voltage was low (lean). Turned out the O2 sensor was contaminated (on the outside), telling the ECU the mixture was lean when it wasn't. If the O2 sensor is your problem it's the opposite case; mixture is lean but the ECU thinks it's ok/rich.
posted by 24.18.226...
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