I had this same problem on a customer's van last week.  I took a spray
bottle of water and while the van was running I went around and sprayed
every electrical connector on the engine.  Nothing happened.  I was
about to give up when I spied the oxygen sensor connector.  It was the
splice in type and they had spliced the wires really closely to the
sensor.  No shrink wrap or tape around crimp splice connectors.  Sprayed
water on this and the van almost stalled.  I replaced the oxygen sensor
with a new one with the long wiring on it and now it is good to go.
Hope this helps,
Ken Wilford
John 3:16
www.vanagain.com

Richard Golen wrote:
> A couple of weeks ago I asked for some suggestions as to what to do
> about a problem I was having when my 87 Westy's engine was damp
> (after or even during a rain storm). The solution I was using at the
> time was to turn off the ignition and turn it back on...however after
> doing it three or four times in the first five minutes of driving
> gets a bit old.
>
> I received many suggestions, most of which centered around various
> connectors and terminals being dirty, etc. Before I started to pull
> apart connectors, etc., I thought I'd roll the dice and try an
> inexpensive option. For $2.00 I bought a can of Gunk Wire Dryer. The
> product claims to dry wires and to leave a coating (petroleum based)
> on the wires. So I sprayed all the connectors in the engine
> compartment, the plug wires, and inside and outside of the
> distributor cap a couple of days ago.
>
> Last night it rained, and this morning the van was wet from the rain.
> This was the usual condition that I experienced the power loss. So I
> took the Westy for a drive and tried to "trigger" the power loss
> (full throttle conditions....low speed conditions), and nothing
> happened...no power loss! So perhaps, the problem is solved? I'll
> keep an eye on things.
>
>
> Ric
>
>