It is possible to get the car started in cold conditions without the CSV by making sure you have fuel pressure and then priming the engine by stepping on the gas pedal with the key on. When you do, a small amount of fuel is squirted into 2 cylinders. Then tap the starter to hopefully rotate the engine 180° so you can attempt to prime the remaining 2 cylinders And then cycle the fuel pump by turning the key on and off without going to the start position and then stepping on the gas pedal a couple of more times.

As you have discovered, not all aftermarket parts are of the same high quality that Volvo originally sold. I can't attest to the quality of the VP supplied fuel injectors as I have never used or sold them.

And as a Volvo specialist, you can now understand why I worry every time I sell or install a non-original manufacturer part that we have never tested before. If I had the time I could tell you some stories of some real crappy parts that are or were out there.

FYI, get a new piece of 5/16"/8mm fuel hose to use for your suck test on the vacuum sensor so you don't have to put your mouth on old dirty hose or buy an inexpensive vacuum pump. Some of the vacuum pump kits come with a fluid reservoir so you suck the fluid out of items like the brake master or clutch master before you start a fluid flush or to drain carb float bowls if you need to clean them out.
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Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com