Ditto on the cap. Pop it off and look for wetness inside. If it's wet, spray it with WD-40 (among other things, it's a water displacement agent), wipe out the excess and see if she'll start.

Check your air filter, too. I don't know how water would get in there, but if the element gets wet, no air will pass.

Oh, and your cylinders get oiled every time they move up and down...

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.