COPs longevity

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No codes, runs good? I wouldn't worry, they seem do OK except when they get wet. When I do my spark plugs soon I am going to rebuild mine since it is so cheap and easy.
 

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Do COPs lose strength over time? My 2001 Bullitt are factory. I don't have any codes, so just wondering if they weaken over 17 years.
In a well maintained car the COP's do not wear out. The things that are bad for COP's are:
  • Excessive spark plug gap
  • Corrosion
  • Heat
  • Moisture
+1 on rebuilding instead of replacing.