Phil, Yes normally, the S8 will CUT a whole cylinder if it detects an electrical failure
on one of the two injectors for that cylinder and give a fault code.
This test is only done if the second injector is active at the SAME time as
the first one in any one fuelling cycle.

However, YOUR particular ecu is an out of date one which you are borrowing until
you decide to buy one properly as I have said I will exchange it when you do this.
This older version does NOT have that injector check feature enabled.
So dont try it !

I should add, ALL weber/pectel modified 8 injector ecu's do NOT have
this feature at all.