In the case of the two plugs for us last year, the plug blew out of the threaded hole with the head threads still firmly attached to the plug threads, nothing left in the head, while driving, both at the same time on almost polar opposite cylinders. Required tapping new threads and a hela-coil. Grapone quoted us at $5400.00, said they had to pull the engine to repair, had it done at my friends garage (professional shop in Loudon) for $700.00, no need to pull the motor out.
When my wife and I were first dating this same thing happened to her 1990 Ford Escort.
I would have no doubt that inserting a new plug with to much torque could start this problem. Our plugs were a little over 50K since the last tune up, so they held for quite a while if this was the case. Hard telling not knowing.
This appears to be a fairly Triton specific issue.
That would be one really large list of poor mechanics if it was a simple case of stripping the threads during removal.
Anyway, no real dog in the fight, could care less what brand of vehicle one drives, I select based on options required or wanted vs. value to get them.
Just thought I would add the information for any potential shoppers out there.
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