[MotorCityG8]

So I changed my plugs and wires today. I had TR6 plugs put in when I did my cam last summer which was about 20k miles ago. I was still using the stock wires though. So I bought some new msd wires and new plugs and switched them today. To my surprise I pulled the plugs and there is typical carbon build up around the outside except for the electrode is glazed over yellow. Any thoughts?

I tried to get pictures but it doesnt turn out right.

 

[G8ATL]

Yellowish glazed appearance is due to High Speed Glazing. This is normal for this type of plug when driving hard. my suggestion is to try a colder plug if possible. Do a engine search for High speed glazing and see what I am talking about.

 

[MotorCityG8]

Thanks. I'll try and go with a slightly colder plug this time.

 

[D-Webz]

I thought the TR6's were a colder plug anyway?

 

[MotorCityG8]

I thought the TR6's were a colder plug anyway?

They are a colder plug.

 

[GT Drew]

I think it is because your plugs are too cold to start with. The yellow is deposit melting. Deposits could be a sign to plug is too cold to start. Then you go WOT and the deposits melt. Go with TR5's and the symptom should go away. Black Carbon deposits are NOT normal. Pending on fuel, the plugs should be tan to a little red/brown.