04 xc90 d5 cold starting problem

[Neilfinlay123]

This is my last post on this subject as I may sell my beloved xc90 if I cannot find a solution. Over the last year I have did the following:

1. Change glow plugs
2. Changed fuel filter (twice)
3. Leak back test carried out by Volvo dealership on injectors (all ok)
4. Leak back test carried out again by my mechanic, injectors removed, tested and sealed (all ok)
5.Changed coolant temperature sensor
6.Changed air flow meter and air box
7. Changed turbo solenoid valve
8. Cleaned turbo governor gauze.
9. Bought new battery.
10. Volvo tested fuel rail pressures, all ok
11. Changed diesel supplier

I am running out of things to change as you can see, my cold starting problem still remains. The engine starts perfectly after its heated for a few minutes, my starting problems occurs when the car sits over night and if it is below 3 degrees, the colder the worse it gets. I can start though with the slightest mistake of easy start in air box ( only as last resort). If I get the car started first thing in the morning it will be fine the rest of that day until the following morning. Does anyone have any idea what this could be?? I left it into a Volvo dealership in northern Ireland and they investigate d for a few days and still could not source the problem either. Really frustrating as the car is driving great but the early morning starting just doesn't happen, I have seen me hanging on the end of the key churning the starting for minutes on end with no joy. Please help if you have any ideas. Thanks guys