[Occ224]

I replaced sparkplug, ignitiom coil, and fuel injector. And it's still missfireing. When i changed fuel injector it was fixed for about 20 miles then it went back to missfireing. What could be the problem? 2008 bmw 335i

[ferocity02]

Lambda sensor or perhaps it needs a walnut blast?

[Occ224]

Originally Posted by ferocity02

Lambda sensor or perhaps it needs a walnut blast?

Would it being dirty cause only one cylinder to act up?

[nOshi]

Looks like you replaced the all the top reasons for a misfire. At what point does it misfire? Idle, cruising, or high load?

If possible I'd do a log so can get a better picture of what's going on.

Just to clarify, did you code the injectors?

I'd also recheck the connections on cylinder 6 coil and injector.

[Occ224]

Originally Posted by nOshi

Looks like you replaced the all the top reasons for a misfire. At what point does it misfire? Idle, cruising, or high load?

If possible I'd do a log so can get a better picture of what's going on.

Just to clarify, did you code the injectors?

I'd also recheck the connections on cylinder 6 coil and injector.

Iy missfires underload around 8 psi i would assume. because it dosnt missfire when stock. I Also did code the injector. I have a log i can send you but i dont know how.