At 02:27 PM 5/9/2009, David Beierl wrote:
>At 11:32 AM 5/9/2009, Rocket J Squirrel wrote:
>>For the record, my O2 sensor cycles at 126 beats per minute according to
>>my metronome. That's 2 cycles per second in a 1.9L @ 3000 rpm.
>
>And 124 transitions in sixty seconds elapsed, 2.1l @3000
>rpm.  140,000 miles, old sensor -- unknown whether original.

Well, I replaced the sensor with an NGK "generic" one.  Immediately I
noticed that the transition times were snappier at low rpm, and that
the transition was faster going from lean to rich.  I finally did the
3,000 rpm check (idling) and got 160 transitions in sixty
seconds.  The NGK sensor has larger gas ports at the active end,
dunno if this makes a difference.

I also have observed that the ECU behavior is sensitive to load as
well as to rpm.  Running up a slight upgrade in top gear at about
3400 rpm/60 mph I counted about 260 transitions per minute.

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"