Not sure what/if there's a exact name for where the spark plug goes in.. well wondering what could cause it to get dirty? I was changing the coil packs and spark plugs and noticed sparkplug hole #3 counting from left to right was the only hole dirty as shown in pic. Any ideas or info?



This is the dirty hole from spark plug #3





Compared to this hole. 3 out of 4 holes look like this pic.

 

That's some good accumulation of residue, no idea though but curious to know where they came from.

 

Yes h I'm curious to know what can cause that. I can tell you I added 4 new coils and spark plugs with recommended brand and I still had cylinder 3 misfire along with a odd whining noise that started happening after is changed out the coils and plugs... so yesterday what I did try to clean the whole alittle and I put a different coil in it and s=emed to drive better then it has since I got the fit 2 wks ago. Cel usually pops back on with in a day so we will see how it goes...

 

The buildup appears to be carbon, which would typically be the result of a spark plug that was not tight enough to seal properly.

 

Thanks for the response I will double check the spark plug