[tirwin]

Sounding more and more like something that is just starting related. The WUR pressures are only going to really come into play in the moments right after starting when the engine transitions from start to run state. You’re not getting past starting. It sounds like you’re fuel starved when cold. Cold air is more dense than hot air, so when the ambient air is colder you need more fuel to compensate for the fact that there is more air per unit of volume. Hence the reason for the CSV.

Once the engine has started, and the engine is cold, you are in the warm-up state. The WUR adds more fuel during this time and gradually backs off to normal running state once the engine is warmed up.

A lower cold control pressure means you’re getting a richer mixture on cold start. If everything else is functioning correctly you would just have some white smoke on startup and the smell of unburnt fuel in the exhaust. What you are describing is hard starting so while the cold control pressure is off, it is likely not the source of your problem. I would make adjusting the CCP a second priority at this point.

Getting to the CSV can be a pain. But the first thing to do is check the easy stuff. Someone already suggested making sure the connector on the back side is connected. Next step would be to verify power and ground. The CSV fires when certain conditions are met. Engine is cranking AND engine is cold. Do you have the Bentley? If so, do the diagnostics associated with the Thermotime Switch. If the TTS has failed the CSV won’t fire. The tests aren’t hard and the TTS is easier to access. The TTS is located on the left side chain cover housing in the far left corner. It has two wires going to it. If the TTS is good then it’s pointing back to CSV and you’ll have to verify CSV is firing when cold and cranking.

Getting to the CSV may require a partial engine drop. You may need just enough clearance to remove the “pope’s hat” and have some room to work.

To remove the electrical connector on the WUR just grab it by the base and pull straight up.