I ponder as to why the recently made 4 cylinder Ford engined cars suffer so much from water ingress causing spark plug/well corrosion, particularly front plug area. Engine heat would surely keep this at bay. Can only assume cars are left outside with cold engines in the rain or washed and put away without starting engine. Absolutely no signs of corrosion or water ingress found when changing plugs on my V6 Roadster with similar coil pack seals. The heads do sit at 30° from vertical though
I did add silicone grease to lips of coil pack seals when replacing though.
Interesting Richard, re the V6.
Mine lives in the garage which is integral to the house, so nice and dry. Always give it a good run after a wash and if away in bad weather, use a John Taylor cover. Thats not to say it never gets a wetting when on the move though and it is used all year round.
Despite my suspicion of condensation, it still beats me as to why it’s always the front plug that gets hit the worst! A real mystery.
As well as greasing the plug lead seals, I also very lightly smear the metal plug body (NOT the threads or taper) with some ceretec grease. (oily rag application) That seems to have helped. The important thing of course, is to remove plugs each year to stop seizure. (That is one thing you can’t always be sure is done unless you DIY.
