What was the coolant temperature? The CS valve is controlled by a "thermo time relay" and I think you need to have a coolant temp of less than 50 degrees for it to activate the valve.

What happens if you disconnect the wire and give it 12V?

Some other stuff to check:

- fuel pressure when cold
- thermo time relay
- coolant sensor (tells relay what the coolant temp is)
- aux air valve
- warm-up compensator (power to it, and resistance across contacts)

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe