Grasping At Straws
The intermittent nature of the water intrusion has me scratching my head. Changing out the H2O pump appeared to cure the problem only to have it reappear a few months later.
Maybe there is a pinhole leak in a cylinder that was blocked in the pressure test. Perhaps by a piston ring? So repeat the pressure test with #1 at the top of its travel (compression or exhaust) then repeat the test with #1 at the bottom of its travel.
I've never torn an A4 down (and hope I never have to) so I'm really talking through my hat here.......
This advice and $5.00 will get you a small coffee at Starbucks (where have I heard that before?)
BTW: Did you retorque the manifold?
TRUE GRIT
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