New Guy with a Galant GSX

The rain got worse and the water got worse, I went out to check the floors and THERE WAS WATER DRIPPING INTO THE NEW ECU. luckily I hadn't started the car, I pulled it and tore it apart to dry it. I searched and only found this thread:

click

I checked and my panels look nearly perfect from the top, so what else can cause this much water?

 

[fuel]

check for rust at the base of the A pillars around the windscreen.