Now i've had the car for about a year, 1 auto-x, 1 time trial, 1 HPDE and about 10k of DD (10 CPO S2 sitting at 34k now) i knew it was time for some plugs



The major reason for this is at the HPDE i was having misfire codes at full throttle that would go away (like coil issues, next project,) about to go on a 1500mi trip as well as mazda calls for 30k SP changes.



The one with the broken head was leading SP rear rotor that i had to take out of the SP wire with a set of needle nose pliers and if you can not see the 2nd pic they are quite "carboned" up


Discuss at what i found today......

 

You found that plugs were "fouled" at around the same time mazda recommends to change those. What is there to discuss?

 

Then change the damn coils... They misfire when there is not enough spark...

 

I was just coming back to bring that point up. Thanks 04Green

 

Why in the hell did the head of the SP come off in the SP boot.


Have been working on fords for 10 years and this is even a 1st for me!

 

It was most likely caused by installation error. It also could have happened during the removal. Although, there is a chance that it was manufacture error. I haven't seen this before, so I imagine it doesn't happen often