David,

I definitely would not call it "lazy". Maybe two or three cycles per second.

For experimentation, I have the O2 sensor output sent to the front of the
vehicle, through a switch, then back to the ECU. The other day while driving
I noticed  the O2 monitor was acting as you described. You guessed it, the
switch was open! As soon as I closed the circuit the display started
toggling rapidly. FWIW I had been driving for twenty minutes and had NOT
noticed any difference in performance. YMMV.

Ken Lewis
http://neksiwel.20m.com/
in statu viae
----- Original Message -----
From: "David Beierl" <dbeierl@ATTGLOBAL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, May 06, 2009 6:38 PM
Subject: [VANAGON] O2 sensor transition time

> Running an '89 2.1l -- how fast should the O2 sensor change
> states?  I don't mean how often, but literally how rapidly at say
> 3,000 rpm to go from .7v to 0 or the other way on Ken's little
> gizmo.  Mine seems kinda lazy to me, but it's been a long time since
> I've seen a new one running.
>
> Thanks,
>
>  --
> David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
> '89 Po' White Star "Scamp"
>