Misfire on Cyl 4

[Klos]

2009 BMW 335XI

So recently I've been trying to diagnose my misfire on my N54, I have swapped coils, spark plugs, injectors, changed injector seals, decouplers. My car is still misfiring at idle and under 100% load for some reason and I don't know what to change or what to swap anymore. If anyone has had a similar problem please let me know, and yes I've literally swapped a set of new index 12 injectors into the car and the same problem persisted. It's not the injectors.

Smoke Test Completed, and no issues.

Compression Test, 175psi

Pleaseeee help me.

 

[Reformatt]

Hopefully this is sorted by now but I would start checking your wiring..and grounds..Start from the coil and work back. Then the plug an work back.

If you have swapped coils an the same cylinder is the issue..something has stopped talking…