Jack -- I have an '81 and it most definitely should NOT have an O2
sensor.  And it's mighty hard to pass the CO too.  Here's an interesting
experiment you might want to try sometime.  I have been taking a community
ed auto mech class, i.e., I've been playing in a big shop.  Hooked up the
fancy analyzer, sure enough, I could hardly get the CO under control.
Bentley says "disconnect the hose from the fuel system to the airbox"
before setting the CO.  I did, set the CO -- _no problem_ getting everything
in spec.  Reconnect the hose -- can just barely get the CO in range.
And that's with a very-recently-rebuilt engine, albeit at 4000 feet
(and yeah, I've tweaked the geared ring in the airbox...).

On Mon, 11 May 1998, Jack Reed wrote:
> To be, or not to be, that isn't the question but it's what jumped from my
> fingers...
>
> Here's the question (as well as the embedded problem)...the van has always
> had a problem with CO2 being in spec.  I've never been able to get it down
> to 1.5.  I was speaking with a local VW guru who told me that all the FI
> equipped motors had an O2 sensor, except that mine doesn't.  The
> supposition here is that a PO swapped out the current non-O2 manifold for
> the prior O2 equipped type.
>
> I don't buy any of this, but it's worthwhile to pose the question to the
> group, maybe I'll get a clue to my unsmoggable issues from someone as
> well.
>
> Thanks,
> Jack

-----------------------------------------------------------------
Gary Shea                                       shea@xmission.com
Salt Lake City                      http://www.xmission.com/~shea