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If your spark plug is black due to being covered by carbon then your engine is running an over-rich fuel mixture. If it is black due to being covered in oil then you have worn piston rings or valve guides. Don't know how long the plug will last though Damian 73 Fastback -----Original Message----- From: SoapDuck@aol.com <SoapDuck@aol.com> To: type-3@umich.edu <type-3@umich.edu> Date: 26 February 1998 20:04 Subject: spark plugs...Good or bad? >If a spark plug is totally black is it bad? If not when is it to dirty to get >a spark out of it? > >Hunter >