C6 Tech/Performance LS2, LS3, LS7, LS9 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
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Old May 2, 2011 | 10:36 AM
  #21  
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looks like the rear two cylinders, particularly on the passenger side have burned away most of the electrode.
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Old Sep 16, 2011 | 05:09 PM
  #22  
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Wow, I totally missed the later posts in this thread. Anyway, the pics posted by LJD51 are what I would expect to see, not the black sooty things that I replaced. The car is still running nicely but I guess at some point I'll have to look at the plugs again to be sure.
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Old Sep 16, 2011 | 06:18 PM
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Since they are out....change them.

Plug look like engine is running very rich. If tuned, you need a re-tune. If stock, just change them.
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Old Sep 17, 2011 | 08:11 AM
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I guess I wasn't very clear, but the plugs have been replaced and the car tuned for quite a while. As far as I know the plugs were never replaced so they had about 53k miles on them. I'm also sure the car was running rich, I just don't know for how long.
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