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Weird O2 Readings #2 Att mcduck 700 1991

posted by  someone claiming to be ibs740 on  Thu Mar 4 07:18 CST 2004 [RELATED]

The reading was done w/ the harness disconnected. It cycled from 60-90 mV.








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    Weird O2 Readings #2 Att mcduck 700 1991

    uid 18083's pic
    posted by  lucid on  Thu Mar 4 10:25 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 12:31 CST 2014
    [RELATED]

    Maybe the sensor is kaput. See if it can respond to a real rich mixture.

    Put your DVM on the disconnected sensor lead, then ground the green lead going to the ECU.

    The ECU sees this as a very Lean signal and will run very rich.

    A good sensor will respond quickly and put out 0.8v or more.
    --
    Bruce Young,
    '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.








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    Weird O2 Readings #2 Att mcduck 700 1991

    posted by  mcduck on  Thu Mar 4 09:48 CST 2004
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    last visit: Sun Sep 9 11:47 CST 2012
    [RELATED]

    In that case, what does it read with the sensor connected?
    The .1-.8 V cycling is only seen with the sensor plugged in.
    60-90 mV is indicative of either a dead sensor or a very lean condition, possibly caused by vacuum leak(s).
    --
    Jim McDonald







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