passenger side floorboard inundated with the torrential rains we have these days.. today the first dry day
took out all soaked insulation material found standing water.. ecu etc ok ... any suggestions as to where water coming
from?

 

1) windshield... water gets around the seal on the outside, and collects in the outside lower corners of the mounting frame, where it rusts through. fix is to remove the windshield, scrape and wire-brush out all the rust, then fill the holes, seal it all with a good polyurethane sealer, then reinstall a new windshield, using the 1993 version which has its own integral seal and fits on the older cars

2) plugged drains for the cowl intake vent. fix is to find those drains, run steel wire down them to poke out whatever is blocking them

3) if you have a sunroof, they are *not* water tight, instead there's a 'tray' around the sunroof which has 4 drain hoses, one from each corner. the front ones go down the A pillars and drain under the car just behind/inside the front wheels, while the rear ones go down the C pillars and through the trunk and drain behind the back wheels. these need to be cleaned of debris with same wire technique (I've used guitar low E strings, or bicycle brake cables for this)

 

thanks pierce
it does have a manual sunroof.. one i dare not open ... usually it will not leak if parked on a slight down slope which
i believe would indicate the front drains are clogged no?
also there is one black wire traveling backward along the passenger side door jamb what would that be for?

 

is that a single wire, or a tube full of wires ? I dunno what harness wires run down the right side, most of them run down the left.

 

not in a tube just a single fairly thin black wire

 

The 7/900 have an unused vent opening (left from previous models) on the left side behind the kick panel, usually capped with a plastic cover which with time leaks, very common. Don't know if 240 have the same feature. Easy enough to check...

If it doesn't leak downslope, the front downhill I imagine, would mean that the front drain holes are free. They are easy to clear, I use a speedometer cable to root them out. The back holes are hard to clear... I park a 740 facing front down this time of year, no problem...

 

i should clarify the sunroof does not leak (that i notice anyway) when the front end of the car is higher than the rear.
what's strange about this is that only the passenger front carpet was wet as well as the insulation underneath.

 

think i found the leaky spot or at least one of them. underneath a removable aluminum sheet next to the rocker panel there was a 1 inch or so hole/gap where the rocker panel meets the right rear corner of the floor pan rusted through to the ground. bondo'd for now .. will see what happens.
thanks for the responses.