Blowby? Any other symptoms? Got a video of it?
I've got a video somewhere but I think I found the problem for sure last night.
Pretty aggressive blowby, but no miss, no knock, no hesitation. Internet had me in fear of needing a motor but after talking to a few people, no one seemed to really agree on what it was.
Did some reading and the copper washer on an injector blowing out can cause that sort of blowby, and I did have an injector that would occasionally throw a contribution code. Confirmed with Forscan and FINALLY got it out last night.
Copper washer is blown, you can see the burn marks up the side of the injector where it was blowing past the seal and the tip actually swelled out. A guy on one of the groups explained it pretty well that when it blows out like that, it loses some of its cooling ability because it's not making good contact with the head and that over heating of the tip is what swelled the end out and was causing the contribution issue.
Got a new injector ready to go in, will get to it next week when I get back from vacation and cross your fingers that's the problem for me lol.