it was the spark plug closest to the fire wall ....
Sep 27, 2011 at 9:51 PM
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MHPAUTOS
✓Experienced Mechanic
31,937 POSTS
The only real solution to this is to pull the head off, trying to remove a broken spark plug in place is not recommended as if you drop any of the ceramic insulator or metal into the cylinder, you can't retrieve it and this can do serious damage to the engine.