The Catalyst made the difference. Based on the CO readings the O2 sensor was working. Notice the value of a properly working catalytic converter. Emmissions reduced by what? ~80%. Now if only the replacement cats would do that as long as the OEM units.

Dennis

----- Original Message -----
From: Kim Brennan
Date: Thursday, September 21, 2006 2:36 pm
Subject: Emissions (reprise)
To: vanagon@GERRY.VANAGON.COM

> A couple of weeks ago I reported that a (new to me) 91 Syncro Vanagon
> with original WBX engine had failed emissions. Well, after getting
> the collective wisdom (most especially from Dennis Haynes) I replaced
> the catalytic convertor and installed a new O2 sensor. Topped
> the gas
> tank with gas (from a 10% ethanol fuel source) and got it resmogged.
>
> Passed with flying colors.
>
> Old Emissions
> Limit Idle 2500 RPM
> HC 125 53 241
> CO% 1.00 0.18 0.53
>
> New Emissions
>
> HC 125 14 44
> CO% 1.00 0.00 0.02
>