There is one way to find if you are dealing with direct flooding of coolant into a cylinder or not. Remove all injectors place over the holes dry clean cloth, then crank engine over, look for a damp cloth this will indicate a leaking head gasket
, cracked head, leaking exhaust
manifold/gasket or leaking injector sleeve if fitted, this will cost you nothing.
If test is unsuccessful, remove coolant heat exchanger
, oil cooler also fuel
cooler if fitted.
A good engineering shop such as Diecon Engineering Brisbane
will be able to test correctly, also repair if necessary. I am not familiar with FW circ pump setup on your engine but this is a another possible leak source.