Car won't start second time.

Hello. I've made progress.
The problem is the caculator is not opening the injectors long enough during a cold restart. On the graph you can see that average voltage on the injectors rises as coolant sensor temperature falls (the blue line I've added) but below 16°C the calculator only lets in a miserable amount of fuel during a re-start.

In fact the engine just needs to turn without firing(injectors, fuel pump and ignition disactivated) and the next time injector opening voltage will be miserably too low if the coolant sensor says less than 16°C. He knows "engine has just turned" via the

TDC sensor.

The fix is to shunt the coolant sensor with a 6.8k ohm resistance to fool the calculator into thinking that engine temp > 16°C during a cold restart. But then when the engine fires, idiot calculator recovers its intelligence, sees a not-cold engine and doesn't deliver enough fuel for a cold engine, which runs down and stalls. I've got about 10 secs to remove the shunt.

I've inserted a list of all experiments.

The first thing I checked was the coolant sensor, it's OK. Anyway it can't be that for two reasons :
1. The car starts fine first time cold. My problem is when I switch off the engine after a few seconds and try to restart it.

2. If I replace the coolant sensor by a fixed resistance corresponding to the temperature it starts cold and won't restart as usual. It's baffilng me.