Well I just want to post that my 1988 300CE finally passed smog. here are the results. (I replaced the 02 Sensor, Motor Oil, Filter, Throttle Linkage rebuilt, Ernst/Mercedes Center Resonator/Muffler, new Exhaust pipe to rear original muffler, clean plugs, good throttle around 525-540 at idle when warm, etc)

15 mph@2503 rpm: %C02:14.90, %02:0.15, HC(PPM):108(Max.110, Avg. 31)
C0%:0.22(Max. 0.71, Avg. 0.10), NO(PPM):0379(Max. 772, Avg. 237)

25 mph@1694 rpm: %C02:14.99, %02:0.09, HC(PPM):61(Max.85, Avg.20), C0%:0.10(Max.0.59, Avg.0.09), NO(PPM):0121(Max.711, Avg.199)

= PASS! PASS!

What can I do to get the levels even lower?

Thanks for everything.

Now I'm looking for upgrade headlamps, struts, shocks, LCA bushings, Transmission mount.

Regards,
Jason

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1988 300CE 120K RIP(Midnight Blue/Parchment)
1987 300E 202K (Arctic White/Palomino)


Now I see the secret of the making of the best persons. It is to grow in the open air and to eat and sleep with the earth. ~Song of The Open Road