O2 sensor failure modes? - Page 2 - Fuelly Forums

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Old 08-27-2008, 06:05 PM   #11
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That's on my to-do list for tomorrows poking, real hard to get live signals without stripping wires Haven't got 100% accurate diagrams and service data, having to trace wires on the vehicle to be sure.
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Old 08-28-2008, 07:39 AM   #12
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Well I picked up an O2 sensor, old one is loose in it's bushing and venting exhaust gas, which probably means it's getting very little backside oxygen to balance the cell, which probably means it's running rich. So it needs an O2 sensor, just hope it fixes the issues.

This is a three wire, grounded through it's case, apparently later ones went to a 4 wire with dedicated signal ground. Hmmmm. If the ground floats a little high though, that means it reads a tad rich, which leans mixture, so I'm thinking "maybe that's good". But I might make a copper gasket with a crimp connector tab on it, so I can strap it to a better ground if necessary.
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Old 08-28-2008, 07:52 AM   #13
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If it was loose, it could have been drawing in a little bit of fresh air via the vacuum between exhaust pulses.

If so, the sensor would see the fresh air coming in and tell the computer the mix was too lean and so the ECU would richen it.
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