Last year, almost exactly a year ago, I posted my '91 Carat's
        smog test results after it had a complete tune-up. I was a bit
        amazed at the results.

        Today (rather tardily :-() I did a tune-up on my '93 Mercury
        Villager, and rushed to get a smog certificate before the late
        registration penalty went up another bunch of buckazoids.

        The Villager is about to roll over to 130K miles within the next
        100 miles or so...I'm totally amazed at the numbers, especially
        in comparison with a two years older Vanagon.

        Vanagon runs cleaner at 2500 and idles cleaner (lower HC) but
        emits more carbon monoxide.

        Here are the numbers C = '91 Carat, V = '93 Mercury VillagerLS):

         2500 rpm
                    MAX allowable      Average     Measured   Result
                     C     V          C     V     C    V    C    V
         HC ppm     0180   0170      0020  0013   0024 0043 PASS PASS
         CO %       1.00   1.00     00.10 00.10   0.00 0.17 PASS PASS
         CO2                                      14.6 14.6
         O2                                        .2   .2
         RPM                                      2527 2488

        IDLE RPM
                    MAX allowable      Average     Measured   Result
                      C     V          C     V     C    V    C    V
         HC ppm     0120  0100       0030  0017   0023 0036 PASS PASS
         CO %       1.00  1.00      00.10 00.00   0.03 0.01 PASS PASS
         CO2                                      14.3 14.6
         O2                                        .6   .4
         RPM                                      0890  754

        NOTE: Neither vehicle had a fresh O2 sensor when tested.
        Oh, yeah...the Carat had 109K miles on it when tested .

        I wonder what would happen if they sniffed the exhaust at
        our typical ~70mph freeway speed for the Carat? The Villager
        runs about 2500rpm in overdrive at 70mph.

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                        Dog is my copilot
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        OLTECO                    Ari Ollikainen, Consultant
        P.O. BOX 20088            Networking Architecture and Technology
        Stanford, CA              Ari@OLTECO.com
        94309-0088                415.517.3519