Triton V8, Water in spark plug holes

Jeff Strickland · 2014-03-03T21:51:18+00:00

I had a leak from the heater core (where the hoses connect) that put water into the #4 spark plug hole. I cured this a few months ago, but recently got a P0303 MISFIRE CYLINDER 3. I pulled the plug and found the hole was full of water/coolant. (Difficult to tell which.) I also pulled the #1 and #2 plugs and found there was water/coolant in these as well. Not as much as in #3, but still more than there should be. What are the possible sources of water in the spark plug holes? My experience with this is that the only source should be external -- leaking heater hoses, water from the car wash, that sort of thing -- but I wonder if there is a more sinister issue I should be looking for.

Mar 03, 2014 21 Replies

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clare 12 years ago

The APP will likely run better than the AP

Correct

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Jeff Strickland 12 years ago

It has not been long enough to know if the fluid is coming back or not, but the Motorcraft plugs are remarkably better than the Autolite AP104 plugs. There is absolutely no question that my truck is happier today than it was 2 weeks ago. Fuel mileage numbers are not in, but the seat of my pants says that the engine is much stronger and far smoother than it has been for about a year, since I put the Autolites in.

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