2006 BMW 760i v12 with code P0441

Question

Ok so I just changed all plugs and coils , had to take intake manifold off to do so .... also changed the cvv valves as well... now I have misfire on cylinder 8 and p0441 coming up on scanner . Can anyone help with any suggestions on where to start next for diagnosing the problem ? Thanks

Answer 1

Hi there

P0441 is an emissions code for a tank venting issue. This could be the result of a bad vent control valve or loose fuel cap.

P0441 BMW - Tank Venting System Function

Read more: https://www.autocodes.com/p0441_bmw.html

For your misfire, I would start by checking for intake manifold leaks. With the engine running, spray some carb cleaner along the intake and see if the idle smooths out or the engine idle speed increases. If it does, then your intake is leaking. If not, try moving the #8 coil to a different cylinder and see if the misfire moves with it. If it does, then the new coil is defective.