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X5 E53 (1999 - 2006)
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  #1  
Old 07-03-2013, 12:07 PM
x5lpg x5lpg is offline
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Location: North east lincolnshire
 
Join Date: Jul 2013
Posts: 3
Mein Auto: X5 E53
P0171 / p0174

hello,
im getting P0171 / P0174 lean codes on bank one and two,
i have an lpg system fitted which seems to working well / driving well
the EML for these codes shows more on LPG, cant find any vacuum leaks and have good spark plugs all round.
any suggestions please ladies and gents?
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  #2  
Old 07-03-2013, 12:48 PM
745iguy's Avatar
745iguy 745iguy is offline
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Location: Massachusetts
 
Join Date: Apr 2012
Posts: 1,133
Mein Auto: 2006 X5 3.0
P0171 / p0174

Quote:
Originally Posted by x5lpg View Post
hello,
im getting P0171 / P0174 lean codes on bank one and two,
i have an lpg system fitted which seems to working well / driving well
the EML for these codes shows more on LPG, cant find any vacuum leaks and have good spark plugs all round.
any suggestions please ladies and gents?
Check for cracks and rips on the intake boots.
If nothing there is bad, you will need to ask yourself if ccv hoses etc are cracked, valve cover gaskets etc and when all else fails you'll be looking into certain other issues. and idk if you're 3.0 4.4 4.6 4.8 or even what year your x5 is as I'm on mobile and you didn't state this in the thread. There are a number of reasons this can happen. How did you check for vac leaks?

Also check out your lpg system. These cars are finicky enough in tolerances without these types of things. If its been like this since the lpg, chances are its something to do with that.


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Last edited by 745iguy; 07-03-2013 at 12:53 PM.
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  #3  
Old 07-03-2013, 01:29 PM
x5lpg x5lpg is offline
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Location: North east lincolnshire
 
Join Date: Jul 2013
Posts: 3
Mein Auto: X5 E53
Quote:
Originally Posted by 745iguy View Post
Check for cracks and rips on the intake boots.
If nothing there is bad, you will need to ask yourself if ccv hoses etc are cracked, valve cover gaskets etc and when all else fails you'll be looking into certain other issues. and idk if you're 3.0 4.4 4.6 4.8 or even what year your x5 is as I'm on mobile and you didn't state this in the thread. There are a number of reasons this can happen. How did you check for vac leaks?

Also check out your lpg system. These cars are finicky enough in tolerances without these types of things. If its been like this since the lpg, chances are its something to do with that.


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my apologies, its a 2001 3.0i auto. I checked for vac leaks by letting engine idle and spraying intake pipes and hoses with wd40 listening for engine variation and looking for bubbling, to no avail. i bought the x5 with lpg system fitted already and the EML came on a few days after i bought it. ill try your suggestions with the intake boots, thanks
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  #4  
Old 07-04-2013, 01:58 PM
Shogan Shogan is offline
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Location: Utah
 
Join Date: Feb 2013
Posts: 26
Mein Auto: '08 535xi & '02 X5
P0171 / p0174

I also have an '02 x5 3.0. Symptoms seem the same, rough idle, I also had white smoke (you). My problem was crankcase ventilation leak (lower hose). I used propane to check for leaks, very hard to get down there. The oil separator and ccv are wear items as the oil breaks down the rubber. Also there is an upgrade part. It is a pain to change. Dealer mechanic gave me a tip (Vaseline and push on not twist but repeat multiple times to loosen things up.


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