I wrote in a couple of days ago about a cold start problem (as on a cold day near freezing) with my 1994 Volvo 940. Since that time, I saw the following comment on the FAQ for 900 series cars.

Cold Start Injector. [Query] What are the symptoms of a failed cold start injector? [Chris Herbst] The cold start valve adds more fuel to the start and cold run mixture for better performance when starting and first started. Then it shuts off. By the way, don't let "cold start valve" and "cold start injector" fool you. They are the same thing. Symptoms often include failure to run without foot on the pedal, and failure to keep running at cold idle. If it fails, it could cause you to have to crank longer on cold starts, although similar conditions on warm start would be less abnormal and more likely to be a fuel supply problem. First see if you read line voltage from the wiring harness to the cold start injector when cranking after the car has sat overnight in cool weather. If the "3-2-1" diagnostic code persists, the cold start valve is faulty.

On the off chance that this is my problem, can anyone tell me where to locate this valve/injector so that I can check for voltage as directed above?

Thanks in advance.