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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 03-16-2015, 12:08 PM
realtordc realtordc is offline
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Location: Virginia
 
Join Date: Sep 2011
Posts: 56
Mein Auto: 2007 x3 3.0 si
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.
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Last edited by realtordc; 03-16-2015 at 12:20 PM.
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  #2  
Old 03-16-2015, 12:32 PM
realtordc realtordc is offline
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Location: Virginia
 
Join Date: Sep 2011
Posts: 56
Mein Auto: 2007 x3 3.0 si
You know what I think I just remembered if you change your air filter without cleaning the MAF sEnsor this what happens and I did not clean the MAF...
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  #3  
Old 03-16-2015, 11:21 PM
Roys4x4 Roys4x4 is offline
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Location: 5K' High in the Sierra Nevada's
 
Join Date: Jul 2014
Posts: 71
Mein Auto: 06 X3,95LR Disco,90 F250
P0301 OBD2 N52 is #1 cylinder misfired
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Last edited by Roys4x4; 03-16-2015 at 11:21 PM. Reason: obd2
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  #4  
Old 03-17-2015, 10:51 AM
realtordc realtordc is offline
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Location: Virginia
 
Join Date: Sep 2011
Posts: 56
Mein Auto: 2007 x3 3.0 si
indeed cleaning the Mass Air Flow sensor cleaned it up, looks like I installed the fuel filter correctly. It seems my MPG is way up (this fuel filter was way overdue at least 90k miles if not 100 or 110k miles).. does a new fuel filter help with fuel efficiency?
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  #5  
Old 03-21-2015, 07:35 PM
Alika808 Alika808 is offline
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Location: Hawaii
 
Join Date: Feb 2013
Posts: 339
Mein Auto: 02 X5 / 02 525 / 98 323
Try to clear the fault and see if the code (fault) coming back.
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