Rough idle when cold
Well I donno what happened .. but My x6 2010 3.5 started few days ago to have a rough idle when cold .
Yesterday , the check engine lighted up .. I took it to the dealership , they said they want to change the valve cover , it is an issue of something called breeder .. which comes with the valve cover .. I did not buy the story ..
Another thing is I remembered I filled the whole tank one day before that started to happen ..
Others friends are saying , maybe the spark plugs or coils or injectors ..
But what i noticed lately that I used to open the driver's door , and used to hear a small sound like a pump .. as if a pre pump ignition .. now I am not .. but donno if this is related .. I told the dealership about the pump thing , they check the realtime pumping pressure and they said both pumps are working fine .. 55 bar and 5 bar ..
So any ideas would be great