With all the talk about the 'Digijet Stumble' -- a problem that has been bugging me for a while -- I decided to try disconnecting my O2 Sensor (Bosch one wire type about 4 months old).  The engine ran great when cold -- nothing new here.  When it warmed up the off idle stumble was not present BUT there were some odd RPM fluctuations at what should have been a constant speed (like my foot got twitchy) and the idle went to crap.  By the time I pulled into the parking lot at work it was barely idling.

I have reconnected the O2 sensor and will continue to be amazed by the quirks of this system.

Chuck
'85 Wolfsburg Westy -- 'Roland'

In a message dated Wed, 7 Mar 2001  7:47:31 AM Eastern Standard Time, Mark Ingalls <ingalls_mark@HOTMAIL.COM> writes:

<< In Closed Loop the FI system constantly corrects the Fuel Injection to
provide the best compromise between power, fuel economy, and emissions. 14.7
to 1 by mass, not volume.
<snip>
Bosch's closed loop system is a big advancement over carburetors or  open
loop FI systems. But I can understand why people abandon it after searching
high and low for solutions to performance problems with our Vans.

Mark Ingalls
85 GL/w digitool

>From: Terry Kay <CTONLINE@WEBTV.NET>
>Reply-To: CTONLINE@WEBTV.NET
>To: vanagon@GERRY.VANAGON.COM
>Subject: O2 sensor stuff
>Date: Wed, 7 Mar 2001 06:17:46 -0600
>
>So, if what I have been reading here lately is correct, the off idle
>stumble, and poor fuel economy, that I have been experiancing lately can
>be corrected, by simpley disconnecting the O2 sensor?
>I replaced mine about 8 mos. ago, and now that you all mention it, this
>is approximately when the problems started.
>
>
>Later,
>
>   ______________
>  |[  ] [  ] [ ]\
>  |    |    |    |
>||-(())----(())-|
>
>Terry 85 GL