Thread: 420's bad plugs
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Old 11-13-2003, 06:53 AM
BobK BobK is offline
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Join Date: Nov 2001
Location: North Central Kentucky
Posts: 1,065
Never a good thing to have strange bits bouncing around in the cylinder. If you are deciding to go to expense of pulling head, maybe find a shop that has the scope to look into the cylinder and examine the walls/valves/pistons first. I replaced the plugs on my 560 recently and part of the tip insulator was MIA. Plug looked like the devil so I don't know if I had a wire failing or just spark going every which way with missing insulator area. Compression seemed ok on all cylinders, though not like new (345k miles). I believe detonation can cause damage to insulator.
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