I'm considering buying a 93 sportline LE that has an aftermarket cat broken inside. These are the results taken the other day in Los Angeles, CA.
15 mph 14.3 %CO2, 0.3 %O2, 157 HC, 0.36 CO, 1092 NO.
25 mph 14.7 %CO2, 0.0 %O2, 93 HC, 0.13 CO, 399 NO.

The Max and Avg for the test are as follows
HC 86 and 21 @ 15
HC 51 and 13 @ 25
CO .50 and .06 @ 15
CO .48 and .05 @ 25
NO 697 and 150 @ 15
NO 724 and 136 @ 25

I'm no expert but it appears that replacing the cat with a larger, better unit will get me 90% better results. If I buy this car tomorrow I'LL need the cat and something of a major maintenance tune-up. The car will need a transmission servicing by the great Wolfgang. The take-off is a little hard but once under load its great.
The head gasket and valve seats and guides will also need replacing eventually. There is a small leak at the front of the motor. I'll do the front cover gasket myself and see whats up.
The sunroof is the other problem, it has a broken guide on one track. I guess I could buy a good used one and replace myself.

Any help appreciated,
Jason
1988 300CE 120K RIP

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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