P0171 and P0174 help

dusty132 · 08-26-2012, 06:08 PM

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.

Solidjake · 08-26-2012, 06:12 PM

Check the DISA

cityjohn · 08-26-2012, 07:34 PM

or possible vacuum leak

JL-330- · 08-26-2012, 11:26 PM

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

JL-330- · 08-26-2012, 11:28 PM

Also check for leaking valve cover gasket as this could in rare cases set these faults as well

taburki1s · 09-20-2012, 01:11 AM

Any updates OP?

dusty132 · 09-20-2012, 07:43 AM

I had fixed the problem by changing my disa out thanks for all the help

Bandit4077 · 09-25-2012, 08:19 PM

was it just the seal, or did it shatter completely? win for jake!

dusty132 · 09-26-2012, 11:05 AM

The seal was destroied

08-26-2012, 06:08 PM	#1
dusty132 Registered User Join Date: Apr 2012 Location: nj Posts: 32 My Ride: 2002 330ci View My Garage	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.

08-26-2012, 06:12 PM	#2
Solidjake Mod Join Date: May 2008 Location: NYC Posts: 19,908 My Ride: 2002 330i View My Garage	Check the DISA __________________ Follow my cross country drive to Bimmerfest West 2013 http://forum.e46fanatics.com/showthread.php?t=987217 Youtube - Electric Fan Swap/Aux Fan Removal - Projector Retrofit - E46 Bulb Guide

08-26-2012, 07:34 PM	#3
cityjohn Registered User Join Date: Nov 2007 Location: Los Angeles Posts: 1,680 My Ride: 2001 M3 View My Garage	or possible vacuum leak __________________

09-25-2012, 08:19 PM	#8
Bandit4077 Registered User Join Date: Feb 2010 Location: San Diego, Bay Area, Mombasa Kenya, Djibouti Djibouti, Dubai, Omaha NE, Aqaba Jordan, Roma Italia, Chicago Posts: 72 My Ride: 330i SuperVeloce View My Garage	was it just the seal, or did it shatter completely? win for jake! __________________ Some say, that inside his helmet, there is another helmet. All we know is... its the feeling you get when you realized that you have put more money into mods and repairs than have on payments...

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08-26-2012, 11:26 PM	#4
JL-330- Registered User Join Date: Aug 2012 Location: NEWARK, N.J. Posts: 3 My Ride: 01 330CI 5SPEED View My Garage	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

08-26-2012, 11:28 PM	#5
JL-330- Registered User Join Date: Aug 2012 Location: NEWARK, N.J. Posts: 3 My Ride: 01 330CI 5SPEED View My Garage	Also check for leaking valve cover gasket as this could in rare cases set these faults as well

09-20-2012, 01:11 AM	#6
taburki1s Registered User Join Date: Sep 2012 Location: Missouri Posts: 37 My Ride: 2003 BMW 330i View My Garage	Any updates OP?

09-20-2012, 07:43 AM	#7
dusty132 Registered User Join Date: Apr 2012 Location: nj Posts: 32 My Ride: 2002 330ci View My Garage	I had fixed the problem by changing my disa out thanks for all the help

09-26-2012, 11:05 AM	#9
dusty132 Registered User Join Date: Apr 2012 Location: nj Posts: 32 My Ride: 2002 330ci View My Garage	The seal was destroied