So if it is a stand alone then just tune it :) I will cry if my cold engine starts of with 2500rpm :D
I have heard of the name but there is no such ECU here where I live.
Can you connect your ECU to a laptop? I had a quick google and I see a black hand held device they use on it :/
If you can not find a sensor then you can ask for someone to measure the resistance of the sensor on a colt engine and then you can just use the resistor in the place of the sensor for a test. Also did you try to use quick start/extra fuel in the intake?
Edit, use a 3000ohm resistor
What is a power FC? Is it programmable?
If so then have a look what the cold start parameters looks like? Maybe its adding a bunch of timing?
This is how I aid cold start with aftermarket ECUs when I do not have an air bleed valve, add about 10deg timing for a short while.
On another note I see...
I do not think it is a fuel pressure problem. When you turn the ignition on the the fuel pump will pressurize the fuel system.
You might have a faulty water temp sensor or faulty throttle body waxstat.
The "fuel rail valve" is not there for what you are thinking it is. It is to regulate pressure...