e90330

Hello. I have an issue with my 545i which leaves me scratching my head.
Since 1.5 years, sometimes I had an issue firing up the car after a cold night. I would run rought, but killing it and restarting would ''cure it and the car then ran fine.
Now, the issue (I suspect it's the same issue) become far worse. After a long standstill, the car starts up ok, but it's a bit rough. I can feel the rpm's fluctuating a bit. Then, after driving around 3 kilometers, I get hit with a fuel smell, car starts to run much worse, eventually it becomes undriveable. Shaking, rpm's fluctuating heavily, doesn't want to rev, engine light on. Restarting doesn't help. Waiting 20-25 minutes and all is good again and the car runs fine for the rest of the way, be it 20 or 200 kilometers. After having it parked for an hour or so, doesn't change it, car runs great. Engine light is a bit of a guess. Sometimes it's on, sometimes off.
I scanned the ECU and I get the codes 2760/2761 (secondary air pump on both banks) and misfiring codes on all cylinders. This happened already 4 times, from the 4 times I used the car. When I start up from cold, I do hear the pump running for a few seconds. Is this something that is known? Can this be somehow pinpointed and if so, how? I do have access to INPA/ISTA but I'm not very knowledable about these applications and how to use them (except pulling codes).
Any help/suggestions would be very welcome. TIA

Edit: forgot to mention the the battery is now around 4-4.5 years old. Could that be causing some undervoltage issues or causing the modules to act weirdly?

seanjordan20

Clean your air pumps and see what happens. Do you know the condition of your plugs and coils. Have you done a smoke test to rule out vacuum leaks especially the PCV. You're going to have to walk out your issues

e90330

is there some diy for the pump cleaning? Plugs are 2-3 years, coils I don’t know but I own the car for 5 years now and I didn’t change them. As the misfiring is on all cylinders and only shortly after a cold start, I would guess it would be very unfortunate for all 8 to be defective? Smoke test is a good idea, I’ll look into this. English is not my native language, so what does the last sentence mean? That is will be a hard nut to crack?

seanjordan20

It was a typo. I corrected it.