Well, that is what to do AFTER you get them out, my problem is that I can't get them OUT.

They just spin and spin, no matter which way you turn them.

I have started saving for a JDM rebuilt motor, street ported of course.

 

In 12K miles my plugs were very badly worn. The center electrode looked like a needle. The car still ran great!

 

I like to let mine go until at night when the engine is running and there are no lights, you can see plasma streaming across the wire.

 

when you get the stripped plug out simply put a CLEAN rag in the whole, then a simple re-tap with the right thread and you're golden. vacuum out the whole, remove the rag - fresh plus, go for a ride When it was time to tune up last year we put Denso's in the car (our parts place was out of stock on NGK's!!) and they seem to work fine...I'll go back to NGK's this time though - i've been told not to use a stock plug since the AF mixture on my car is leaned out quite a bit (S4 NA). My EGT's are a solid 820-840 depending on outside temps at WOT but which do I run, All leading or all trailing (I forget). Should I run a stage colder as well???

 

With the stripped hole......get the old ones out....then when you tap the hold take axle grease and coat the tap with it....if you go slow and don't create a lot of heat all metal shavings should stick to the grease on the tap. After done taping clean carefully with a rag.

 

Also on the cost of the plugs.....I operate an auto parts store....the average price I sell them for is around 7 or 8 dollars a piece for NGK's. They are not popular....and the only reason I keep a set in stock is for me and others that come to my store because of me being a rxer owner.