Alright so yesterday I was driving and smashed a bit in 2nd gear and my CEL started blinking, car bogged down. Pulled code and it was cylinder 1 misfire. So today I changed the plugs since I recently bought the car and it just rolled 65k, figured might as well do them. While I was changing the plugs, from left to right (cylinder 1-4 I believe), cylinder one's plug had a sort sludge/carbon all around where the coil attaches. Cylinders 2 and 3 had rust/corrosion around it, pretty much where it meets the engine after being fully screwed in. Cylinder 4 was clean for most part.
My question is, what would this sludge/carbon/rust be from? As for mods on the car it has Cobb SRI, turboxs BOV, a cat removed from exhaust, no tune or AP. Here are some pics,
![Spark plugs.jpeg Spark plugs.jpeg](https://mazdas247.com/forum/data/attachments/123/123892-cfac1368de509af13922235395afb137.jpg)
![sparkplugs2.jpeg sparkplugs2.jpeg](https://mazdas247.com/forum/data/attachments/123/123893-fd78161a55769fa74d03c695bd6160b9.jpg)
![Cylinder1.jpeg Cylinder1.jpeg](https://mazdas247.com/forum/data/attachments/123/123894-0c7abd68d5dfb793eeabe2fdf37c9e5a.jpg)
My question is, what would this sludge/carbon/rust be from? As for mods on the car it has Cobb SRI, turboxs BOV, a cat removed from exhaust, no tune or AP. Here are some pics,
![Spark plugs.jpeg Spark plugs.jpeg](https://mazdas247.com/forum/data/attachments/123/123892-cfac1368de509af13922235395afb137.jpg)
![sparkplugs2.jpeg sparkplugs2.jpeg](https://mazdas247.com/forum/data/attachments/123/123893-fd78161a55769fa74d03c695bd6160b9.jpg)
![Cylinder1.jpeg Cylinder1.jpeg](https://mazdas247.com/forum/data/attachments/123/123894-0c7abd68d5dfb793eeabe2fdf37c9e5a.jpg)