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Re: Just the facts
Posted by Bill S. [Email] (more from Bill S.) on Fri, 28 Oct 2005 05:10:10
In Reply to: Just the facts, John Roberts, Thu, 27 Oct 2005 20:21:54
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JR, I also have an '85 900T (with LH2.2, natch) -- I'll try to make time to duplicate your experiment and report my results, for your peace of mind.
I'm pretty firmly of the school that the *source* of the voltage fluctuations is the O2 sensor's response to the modulating air fuel mixture, as stated by others, and that the ECU 'listens' to the sensor's signal (rather than the other way around) -- it's consistent with my experience, my training, and my intuition. BUT nonetheless, what you see is what you see, and if you saw a fluctuating voltage on the ECU side of the signal wire when isolated from the O2 sensor, there is no denying what you saw with your own eyes. *Why* you saw what you saw, and whether or not it's the way it should be, may be a complex issue, but there's little more frustrating than having people tell you your own observations didn't happen!
I'll at least try to disconned the sensor and measure the ECU side voltage of the connection with the car fully warm (a quick and easy test), and, time permitting, will try to see what it does when cold and as it warms up.
Best regards,
-- Bill
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