O2 sensor oscillations

[David A. Cooley]

At 08:08 PM 10/21/98 -0700, you wrote:
>OK, Here's a question:
> I read that, while in closed loop - the voltage on the O2 sensor is 
>supposed to cross 0.45 at some particular rate.
>
> Are these crossings producted by "puffs" of exhaust going across, or is 
>the ECU intentionally running lean-rich-lean-rich-lean in order to keep 
>the avg mix (over time) "centered" on the ideal?
>

The ecu goes lean-rich-lean-rich.  The ECU usually just looks for
conditions the engine is hot and then looks to make sure the O2 sensor
doesn't stay rich or lean for a specific length of time... if it stays
greater than the time set in the Prom Calibration, then it set's a code.

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           David Cooley N5XMT           Internet: N5XMT at bellsouth.net
     Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
       I am Pentium of Borg...division is futile...you will be approximated.
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