What you are probably seeing here is the work of a proficient CAT converter.

It basically eliminates half of the HC and CO that the O2 and the ECM let thru.

Steve

Date:    Wed, 20 Jun 2001 08:32:17 -0700
From:    Ari Ollikainen <Ari@OLTECO.COM>
Subject: Re: '91 Carat smog test results

At 10:13 AM -0500 6/20/01, Dave Baker wrote:
>Are you saying you had NO measurable carbon monoxide in your exhaust at 2500
>rpm????
>
>  >          2500 rpm
>  >                     MAX allowable      Average     Measured   Result
>  >          CO %           1.00            00.10        0.00      PASS
>  >

         YUP...it's NOT a typo. Measurable within the limits of accuracy of
         the test instrument readout ie <.01%. That's what the report from
         the test says.  And the test results are certified by the testing
         station operator as "true and correct".

         I was amazed too...

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         OLTECO                    Ari Ollikainen
         P.O. BOX 20088            Networking Architecture and Technology
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