After miserably failing the clean air test one day then passing the next day after only increasing the idle .
The First test results which FAIL were as follows :
at curb idle 678 RPM
HC -- limit 300 reading 650 -- CO limit 1.50 reading 8.18-----
At 1644 RPM
HC-- limit 90--reading 334---CO--limit ,50-- reading--8.41 NO-- limit 979 -- reading 36

The strange thing to me is that just by increasing the idle a bit the HC, Co went down BUT the NO went up dramatically. PASS results as follows.
At 1671 RPM
HC reading 68---- CO reading 0.04 -------- BUT---------NO ppm went up to 354
I know at this point it's all just academic but are these cars so finicky ?

ALSO since I am typing away - can anyone please tell me the engine specs for my 1986 300E -- does it have a 3 L or 3.2 L what is the horse and torque power?