Thanks to Peter and Duke for your help.

Peter,
The Mass test is a dyno the NOX was the highest at the steep acceleration ramp I would assume it was full throttle and therefore full advance. The other readings were:

HC limit 2.00 actual 1.16
CO limit 30 actual 6.47
CO2 limit none reading 379 all grams per mile
and NOX limit 3.0 actual 3.6 last time


Duke
The emission label is missing I was going by the MB CD for engine group 116.962 gives the advance settings for the distributor that I quoted earlier because the test failure was at full throttle then should I retard the 6 deg from the 25 deg advance without vacumn and make it 20 probably as close as I can come at 3000 rpm. The 25 deg setting looks right as the balancer has a welded in post at 25 deg mark.

Another strange thing is that I cannot find an EGR valve on this car I have the MB SL CD and find reference to it but nothing under the hood as far as lines or valves on the exhaust manifolds. All other emissions equip seems to be in place and working the air pump etc. Was it removed or were there engines without it?

I also changed plugs they were a bit carboned up and a new air filter.
Thanks again.

__________________
Bob

1985 380SL 110k,mi
2000 Harley Dyna Conv 29k,mi
2004 Honda Element 48k,mi
1999 Honda Accord EX 156k,mi
1984 380SL 90k,mi (gone)