Testing a cold start injector - '91 300CE (M104)

[rgnprof]

I am stumped. I have had cold start problems for years, literally...Have finally got around to pulling the cold start injector and have no fuel coming from the injector while cranking...

Did some more tests this afternoon. With KOEO, I have 12 volts at the cold start valve connector and it does not drop below 10v while cranking. When I hook up 12v battery voltage directly to the cold start injector, it sprays fuel perfectly. But, I can not get it to spray while cranking. I have a spare coolant temp sensor (4 prong one) and I put it in a cup of ice water and hooked it up to the car's wiring to try and simulate cold weather. Ohms adjust appropriately - to 5+k ohms, so I think this worked, but it still won't spray any fuel.

Why is my CSV not working?

Any ideas?

Ryan