I'd be interested to know if it was still there after 50 miles? Have
you had it
since it was new? Would too cool of thermostat not let the
engine/exhaust get hot
enough to burn off the water in that distance? I wonder if a large
muffler could hold enough water
not to burn it all off in 20 miles.
I've also seen blown intake-manifold gaskets do the same thing. Is ther a
vassaleen-looking gell inside the oil cap? Loose just a little water (refil
1/week or 2?)? Try spraying engine starter fluid around the manifold gasket and
if the engine idle speeds up you've found a leak - if not you may still have
one. Especially if you're seeing water drip on hot dry days and vapor clouds.
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