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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 08-26-2012, 06:08 PM   #1
dusty132
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P0171 and P0174 help

Alright so I got these two dreaded lean codes on my car. I have already replaced both intake boots and my fuel filter a while ago. I also tried cleaning my MAF with cleaner. I still have a slight whistle from somewhere but I can not pinpoint where it is. Please let me know any ideas.
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Old 08-26-2012, 06:12 PM   #2
Solidjake
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Check the DISA
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Old 08-26-2012, 07:34 PM   #3
cityjohn
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or possible vacuum leak
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Old 08-26-2012, 11:26 PM   #4
JL-330-
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Get a can on brake clean and spray intake and all surrounding vacuum hoses and disa valve, if idle changes then you have a intake leak and or vacuum leak, also remove disa valve hold magnet to metal pin in the end and see if the in is held in place, also with car runing slighty open
oil cap dont pull it off just slightly lift it u should feel vacuum pulling the cap back down, if extreme vacuum is felt then you probably need a crankcase vent valve do not install the updated foam insulated one on the e46 as this is not needed but do replace the oil dipstick with the up dated one., long story short its most likely the crankcase vent valve
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Old 08-26-2012, 11:28 PM   #5
JL-330-
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Also check for leaking valve cover gasket as this could in rare cases set these faults as well
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Old 09-20-2012, 01:11 AM   #6
taburki1s
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Any updates OP?
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Old 09-20-2012, 07:43 AM   #7
dusty132
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I had fixed the problem by changing my disa out thanks for all the help
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Old 09-25-2012, 08:19 PM   #8
Bandit4077
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was it just the seal, or did it shatter completely? win for jake!
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Old 09-26-2012, 11:05 AM   #9
dusty132
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The seal was destroied
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