SOLVED! Culprit was loose intake camshaft seal, allowing vapors to escape and condense in the distributor cap (definitely WATER, not oil) No moisture in cap since I replaced the seal; Misfires gone! See http://repairpal.com/condensation-in-distributor-cap-640 Who would have thought? Seriously.
Not sure how the seal came off. I had replaced all the PCV components a few years ago, so I would be surprised if excess pressure blew it out. Possibly installed incorrectly and just worked itself out. Regardless ... Life is good again!
--
1998 S70 T5, 5-speed manual, 228000 miles
|