[jojo2333]

Misfire in cylinder 1. Ruled out coils and spark plugs, swapped out the injector for another injector but problem persisted. Gonna try a different injector again tonight. NO CODES OTHER THAN MISFIRE CODE*****

I also notice a boost leak / boost lag but there is also no code appearing for that.

Valve cover replacement tonight because of oil leak, and also gonna check the valves to check for carbon build up while I'm doing the valve cover.

Compression on all cylinders is good.

MHD responded to my log saying it could be injectors and that I have an AFR issue.

I don't know what else to check at this point. I'm hoping maybe I'll find something tonight when I look at the valves.

Any ideas? Check out my log if you'd like.

https://datazap.me/u/itsjoseph23/3rd...#38;data=21-27

[stewbets]

Looks like you definitely have a leaking injector in bank 1. Your fuel trims are much lower on bank 1 and the AFR is lazy in returning to 235 when coasting. It may not be injector 1 that's leaking, though. I always like to start with the smell test. Shut off the engine for an hour or so and pull the plugs to see which ones smell like gas. I agree that you also have a boost leak. It's not all that uncommon not to get 30FF with a boost leak.

[jojo2333]

Originally Posted by stewbets

Looks like you definitely have a leaking injector in bank 1. Your fuel trims are much lower on bank 1 and the AFR is lazy in returning to 235 when coasting. It may not be injector 1 that's leaking, though. I always like to start with the smell test. Shut off the engine for an hour or so and pull the plugs to see which ones smell like gas. I agree that you also have a boost leak. It's not all that uncommon not to get 30FF with a boost leak.

Yea cylinder 2 is leaking bad, I have index 12s currently en route to me. Cylinder 1 is the misfire tho which throws me off. Cylinder 1 plug isn't covered in fuel. Even swapped a different injector in there to test and it's still misfiring

[Dave92N54]

You also may need a LPFP. You're dropping to 52psi. I'd check again after injector replacement to be sure though.

It definitely looks like a boost leak as well, not sure how you didn't throw a 30FF. You're WGDC is maxing out trying to make target. Do your wastegates rattle?

[stewbets]

Originally Posted by jojo2333

Yea cylinder 2 is leaking bad, I have index 12s currently en route to me. Cylinder 1 is the misfire tho which throws me off. Cylinder 1 plug isn't covered in fuel. Even swapped a different injector in there to test and it's still misfiring

Cylinder 1 is likely misfiring due to lean conditions. The O2 sensor for bank 1 is reporting rich due to injector 2 leaking fuel, so the DME is pulling fuel from bank 1 to compensate and causing cylinder 1 to go lean in the process. Leaking injectors can cause a whole host of problems.

[jojo2333]

Originally Posted by stewbets

Cylinder 1 is likely misfiring due to lean conditions. The O2 sensor for bank 1 is reporting rich due to injector 2 leaking fuel, so the DME is pulling fuel from bank 1 to compensate and causing cylinder 1 to go lean in the process. Leaking injectors can cause a whole host of problems.

Wow, thanks for that info. Honestly helped big time. I'm gonna throw in an older working injector into cylinder 2 and see what happens. the DME shouldn't need to compensate if I put a non-leaking injector in cyl 2. Thank you man! I'm gonna test it tonight.

[jojo2333]

Originally Posted by stewbets

Cylinder 1 is likely misfiring due to lean conditions. The O2 sensor for bank 1 is reporting rich due to injector 2 leaking fuel, so the DME is pulling fuel from bank 1 to compensate and causing cylinder 1 to go lean in the process. Leaking injectors can cause a whole host of problems.

You were spot on. Injector swap fixed it no more misfire. Wow, wasn't expecting that but how you explained it made it all make sense. Now time to find this mysterious boost leak lol.

[stewbets]

Originally Posted by jojo2333

You were spot on. Injector swap fixed it no more misfire. Wow, wasn't expecting that but how you explained it made it all make sense. Now time to find this mysterious boost leak lol.

Hey, that's awesome! Thanks for the update.