2005 4.6 Explorer Cylinder 8 Full of Water
 

My 05 Explorer 4.6 after setting up several days has engine lockup pull number 8 plug and you can take a shower. This 4.6 engine has an Aluminum intake manifold the water level has only dropped about 3" in 3 months however the water that comes out looks clear. I plan on removing the manifold tomorrow I hope it is only a gasket. Any suggestions would be much appreciated.
W Ross :-huh

Cross Over Leaking
 

I have found what you describe at least 3 times problem in each case there were cracks in the plastic manifold between the water jacket and intake. That is why I have the solid Aluminum Manifold on my 05 Explorer I am afraid if the intake Manifold gasket is good I will have to pull the Head. One other way to solve the problem you described in your very good Post is to remove the plastic from under the Aluminum cross over on the intake manifold and sit the crossover on the intake gasket from there I would hope problem solved unless there are cracks in the intake Manifold at number 5 or 8 cylinder. Great Post!