Changed sparkplugs...comments on old ones?

[hugo_nz 166]

Hi Folks,

Finally received the socket required to change the plugs on the 6er. Did it this morning, and it was a fairly quick and painless job. Old plugs don't look great, and right after I put everything back together took the car for a drive and had a misfire on cylinder 8. Now, my car has been having some random misfire issues  which is why I decided to swap out the plugs and coils. Only injectors left to check (will use an endoscope to check the index numbers). ISTA did also report that the fuel pressure on bank one did not pass the diagnostic test, but the cylinder specific tests did not show any issues with the injectors :confused2

Anyway, photo of the old plugs below. Viewer link for full resolution: https://ibb.co/QKF3NGy

Grateful for any feedback.
H

[hugo_nz 166]

This is the culprit. The new plug I installed on cylinder 8 seems to be faulty. Swapped plugs and coils between 7 and 8 and the misfire followed to no 7 along with lumpy acceleration just before the car went into limp. Put one of the better looking old plugs back and presto, no limp, no misfire and no my lumpy acceleration. 

I also checked the injectors with an endoscope today. All of them are index 09. I re-entered all their adaption values in ISTA and did a cylinder purge. Immediately noticed how the smell of the exhaust gas went from fuel-rich to smelling no worse than water vapour.