Changed my spark plugs yesterday (using TheRock's helpful guide). Bought 4 different wrenches at the auto parts store trying to find something that would work better but it's really just a beast, not looking forward to the next time. Also I think I will order new coil pack retainer bolts for the next time as I don't think those little star heads will last more than a couple changes without stripping.

They all look pretty clean and normal, except for cylinder 2B. I have 42k miles btw on a 2014 V8 S.





Bad sealing ring, getting blow-by on the plug perhaps? New one went in easily and smoothly by hand like all the others. I've never felt or heard it miss or otherwise run unevenly.

Something concerning? Any theories?

 

This is what the rest looked like:

 

IMO, your plug looks fine, on the bottom side at least. It's what I'd expect at that mileage and doesn't appear to be not sealing. However, the top side shows water is sitting on top of the plug in the cavity causing the corrosion.

 

I wonder how water got in there? The coil packs have a pretty thorough set of rubber seals and they can't really back out with the retaining screw tight. Any wild theories?

 

My wild theory: You have a coolant hose beginning to fail, allowing a small amount of coolant to accumulate around the plug. As the engine heats up, the coolant evaporates, leaving behind a corrosive (to steel) orange residue. I don't have an F-Type, but if I saw this on my X150, I'd be going through the cooling system with a fine-tooth comb.

 

Oh that's an excellent theory. There are coolant hoses (with weird, snap-latch plastic fittings) right above this cylinder. Marked at #2 in the TheRock's doc:

 

I see a small amount of weepage around the SC/intercooler gasket - I’d check that too. My car, after 69k miles...

 

Lovely. Will do, thank you!

 

Having a 2014, your coolant hoses and pipes are due to be replaced. Most notably the y pipe.

 

Interesting.

That's apparently a known issue? Is there a TSB or some guide on what that entails? Has anyone done it themselves?

 

Try https://www.jaguarforums.com/forum/f...2/#post2371612

 

Yes, yes, and yes.
https://www.jaguarforums.com/forum/f...placed-197383/
https://www.jaguarforums.com/forum/f...emoval-240307/