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Yup, the carbon locks the plugs in place. When I get one that I think will break, I pull the injector and fog the combustion chamber with PB blaster overnight several times.
Usually, with some care they will come out.
However the GP can only take so much torque and when they break on the plug body above the threads, you are hosed!
That's when it is head time.
And yes, this job can be done under Starmark If you
have a good shop with a good warranty clerk and
you have a good attitude when you bring the car in.
Dr.D
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