Need a plug reading

[smokinss]

This coming Sunday I've got a private track rental to go to so I figured I would do some basics before hand. Changed the oil/filter, fuel filter, and new plugs even though the ones I took out were only like 2 months old and had 2 bottles on them. Anyway I pulled number 8 out and found this. Now mind you the motor has almost 150k on it and a 100k worth the spray. I know the the motor is tired but to me it looks like it could be sooner than later that I will have serious issues by looking at this plug. Also there was oil on the threads. Maybe Don could chime in on this one.

[SLP IROC-Z]

looks like ash to me

[ILuvPizzaTimes10]

http://www.v6z24.com/mods/howto/images/plugs/plugs19.jpg

Ash - lean on fuel in that cylinder from nitrous? says caused from fuel additives. do you add anything?

[smokinss]

No don't add anything. Wondering if its from the oil adadditives? there was oil on the threads. But I did install new valve seals when I changed the cam last year.

[Formula413]

I had a plug that had some ash on it like that, and probably not coincidentally I think my car has bad valve seals. The electrode was not white like yours however, which would suggest excessive heat or running lean. I assume it's a colder heat range plug for the spray? If you just did valve seals and there's still evidence of oil it might be worth doing a compression check just to rule it out, although you might be down compression anyways from the life that motor has had.

[smokinss]

Oh I can almost be sure that the motor is down on compression and the rings are gettting worn.

[My84Z]

Back cylander isn't getting enough fuel common on nozzle systems just be careful or jet up a tiny bit more fuel

[ILuvPizzaTimes10]

oil burning can also cause detonation at high rpm. food for thought.

[Slowhawk]

rings are shot. But we know this. Pull 2 degree's of timing on the spray.