Hi Guys

After having done all of the basic service stuff, the VX is still running rough.
Although there is no oil in the water or water in the oil I have done a compression test and it goes something like this

1 = 190
2 = 170
3 = 180
4 = 0
5 = 170
6 = 165

I all happy with all the cylinders results (after 260000 km) except for cylinder #4.
I am trying to think of a reason why I would get this sort of result as it is not the standard results of a blown head gasket.
Thinking maybe stuck valve or broken con-rod or maybe even a hole in the piston.
Any other ideas??