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X3 F25 (2011 - current)
The latest X3 brings added style and new features to the BMW's mid-sized SUV. Talk about the BMW F25 X3 with other X3 owners now!

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  #1  
Old 09-26-2016, 07:23 PM
gresh gresh is offline
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Location: VA, USA
 
Join Date: Aug 2016
Posts: 81
Mein Auto: 2013 X3 2.8i
2013 X3 N20 Engine Replaced - P0171 Error Code - HELP!

So here is the latest.

I was looking over the engine and noticed that one of the engine bolts to the transmission was not tight. So I tightened it. Since I had the wrench, I checked other bolts. All good. I decided to go back to the basics for P0171, valve cover or vacuum hoses. I had the valve cover installed by the quite incompetent German Auto group when they installed the engine, but I assumed it was good.

Well, come to find out, it was not. I found 2 valve cover bolts that were not even hand tight. I tightened them and reset the adaptations using ista.

Before the Ltft was 25+
After the Ltft is 4 at idle and 0 while driving

So, thanks to F30 and all others ho tried to tell me it was a vacuum error. I will never doubt you again.

Bottom line, problem solved. Lots of praying on that one.

Last edited by gresh; 09-26-2016 at 07:36 PM.
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  #2  
Old 10-17-2016, 01:11 PM
F30ed F30ed is offline
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Location: Chicago
 
Join Date: May 2016
Posts: 56
Mein Auto: F30 328i
Super. I am really glad you solved that one. Well, it would be hard to guess that valve cover is not bolted in properly. Mechanic may not follow bolting pattern or simply forgot to tighten those 2 bolts... Human mistake.

Good thing - now you know the engine better than 99% of people here.
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  #3  
Old 10-17-2016, 01:46 PM
gresh gresh is offline
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Location: VA, USA
 
Join Date: Aug 2016
Posts: 81
Mein Auto: 2013 X3 2.8i
Quote:
Originally Posted by F30ed View Post
Super. I am really glad you solved that one. Well, it would be hard to guess that valve cover is not bolted in properly. Mechanic may not follow bolting pattern or simply forgot to tighten those 2 bolts... Human mistake.

Good thing - now you know the engine better than 99% of people here.
Yes, that's true. I literally have replaced the entire evap, most of the intake and some of the fuel system. Not much about the N20 that I don't know

Thanks again for your patience and help. Great to have folks like you around to keep me grounded in fact
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