I had this same issue.  Your gas mileage is taking a BIG hit.  Replace your
O2 sensor and things should straighted out.  The sensor  should be putting
out between 1/2 and 1 volt (varying)with the engine running.  Hope this
helps.
   Rich

>From: Tom Young <young@SHERLOCK.SIMS.BERKELEY.EDU>
>Reply-To: Tom Young <young@SHERLOCK.SIMS.BERKELEY.EDU>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Ox sensor use
>Date: Mon, 25 Oct 1999 08:08:59 -0700
>
>Well, if the O2 sensor isn't working, that is, not generating voltage in
>response to chenges in air/fuel mixture, then disconnecting it would
>produce no change in the measurements because the sensor "wasn't there"
>in the first place.
>
>When the O2 sensor isn't sending a signal to the ECU then the ECU is
>supposed to default to a somewhat rich mixture (hence your high CO) which
>will typically be pleasing to the driver, even if the environment doesn't
>like it.
>
>On Mon, 25 Oct 1999, Jose R. Moscoso wrote:
>
> > Today I took my '84 Westfalia for state-required inspection after
>installing
> > the muffler and catalytic converter bought from BD.  Surprisingly, the
> > W***F***** didn't pass the test because of high CO measurements in high
>RPM.
> > The guy doing the inspections argued that my problem is a bad Ox sensor
> > which he disconnected to prove his point without no change in
>measurements.
> >
> > I find my van to run quiet acceptable and I am worried about
>contamination,
> > what is the verdict from the gurus.  What is the use of this sensor if
>it
> > doesn't seem to produces any change in the running of the van.
>
>---------------------------------------------------------------------
>Tom Young               young@sherlock.SIMS.Berkeley.EDU
>Lafayette, CA  94549    '81 Vanagon
>---------------------------------------------------------------------

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