Thanks Dennis-good advise. I did clean up the ground near the coil which
has the larger ground strap for the engine. I'll try cleaning this other
ground  as you suggested also. I also tried spraying the connections for the
temp II  sensor with WD40 per previous suggestions. This seemed to possibly
have a short  term effect. I will try shutting off and restarting while the
engine is turning  to see if this changes anything. The O2 sensor voltage is
moving from about .1  to .7 volts. Someone prior to me had at one point
created a crude splice in the  temp II sensor on the sensor end and I tried a few
years back to create a better  splice/connection and may need to work on
that again. I am curious as to the  best way to better this splice without
having undue effects on the resistance.  Anyone have any ideas on how to best
repair a splice at the end of the harness  going to the temp ii sensor. Thanks
everyone.

David

In a message dated 5/26/2009 11:00:02 P.M. Eastern Daylight Time,
d23haynes57@hotmail.com writes:

An easy  way to diagnose if a mixture problem is due to the O2 sensor is to
turn the  ignition off and back on while the engine is still turning. If the
problem  clears for 30 seconds or so then the O2 sensor or wiring is the
problem.  Also try full throttle (assuming the full throttle switch is
working). If  you suddenly get the burst of power, again back to the O2. The
most  important ground connection for the O2 is the brown wire that goes
through  the distributor harness. If it is connected to the engine at one of
the oil  breather tower screws, move it to something metal on both sides.
Check the  ring terminal carefully. The crimp can look good but that
corroded
wire  makes for a lousy connection. New ring terminals with the heat shrinks
ends  will work wonders.

Dennis

-----Original  Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]  On Behalf Of
David Clarkson
Sent: Tuesday, May 26, 2009 11:04 AM
To:  vanagon@GERRY.VANAGON.COM
Subject: intermittant rich running  problem

Just a follow up to the previous post. The oxygen sensor  voltage seems to
be swinging between .1-.7 volts with the engine warmed up.  Thanks for any
help  that you can offer fellow  vanagonauts.

David

In a message dated 5/26/2009 10:34:31  A.M. Eastern Daylight Time,
Dvdclarksn@AOL.COM writes:

I'm   having an intermittent rich running problem with my 90 2.1  liter
Westy.
This was the same symptom that I had that was fixed 13 mos.  ago with  a new
temp  II sensor. This has been replaced with no  effect. One  other
interesting thing  that I noticed when  attempting to install a  wire to
feed an oxygen
sensor   monitor was that just connecting an  additional wire to the  sensor
causes an  immediate rich running  condition. I had a  problem this morning
when the engine  was started  cold with  running rich also. Am I looking at
a
problem involving   cleaning  up some grounds again. I'm thinking that I may
also
need to test   the  voltage coming from the sensor and also at the ECU.  Any
ideas  towards diagnosing  this problem would be  greatly  appreciated.

David  Clarkson
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