Originally Posted by Niburu

It shouldn't, how many modern vehicles even have a distributer?
On a properly sealed distriburter cap there should not be enough moisture in it to cause enough condensation from it being cooled that little bit to interfere with the spark.
Otherwise there would be millions upon millions of cars not starting all winter long north of Florida.
Steam cleaning your engine bay on the other hand can easily mess with your underhood electronics, it's small enough to get in everywhere.
And yes if you douse the elctronics with enough water you'll kill them, but I suspect the front of said vehicle is underwater at that point anyway.