Code P0301 after changing fuel filter?
I just changed my fuel filter (07 X3) and also my oil and engine air filter (I'm pretty sure those had nothing to do with it though bc I'm familiar with those procedures but I've never done my fuel filter before.).
After I finished I started it up and it idled normal foe a few mins then when I felt certain all was ok I took it for a spin and check engine came on, I pulled P0301 misfire cylinder 1 (pending status?).
I'm wondering if it could maybe just be bc I had de pressurized the lines and only had about a gallon in the tank (07 x3 has in tank fuel filter) so it was running lean with some air in the fuel lines? I don't want to go fill it up yet since if I need to work on the filter installation I don't want much gas in the tank.
Also I'm wondering if maybe a hose is loose or what else this could be. I found a part in the fuel tank I'm not sure what it is but it was not connected to anything to my knowledge but maybe I knocked it loose without knowing it... Looks like a little mushroom. Pic attached
FYI ignition coils and plugs were just changed less than 5k miles ago so I don't think that's it.
Last edited by realtordc; 03-16-2015 at 12:20 PM.