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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-29-2012, 04:23 PM
putitupmike putitupmike is offline
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Location: San Francisco, CA
 
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Posts: 88
Mein Auto: 2001 525i wagon
2001 528i. running lean

Error code says that both front banks are running lean. What is the first thing I should do?
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  #2  
Old 10-29-2012, 05:14 PM
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16valex 16valex is offline
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Location: Albany NY
 
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Mein Auto: 530I/5SC 97-528/5
Quote:
Originally Posted by putitupmike View Post
Error code says that both front banks are running lean. What is the first thing I should do?
Vacuum leak.
second is vacuum leak.
And the third thing to check is...you've already know.
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  #3  
Old 10-29-2012, 06:00 PM
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MikesE39 MikesE39 is offline
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Mein Auto: 03 530i Loaded
2001 528i?? does that exist?
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  #4  
Old 10-29-2012, 06:12 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,481
Mein Auto: 02 BMW 525i M54 auto 130K
Fourth thing is vacuum leak ...
Fifth is vacuum leak ...
And, sixth ... is ... umm ... look here.
- How to diagnose a BMW E39 engine misfire (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #5  
Old 10-29-2012, 10:09 PM
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ztom ztom is offline
I gotta have more cowbell
Location: Thousand Oaks CA
 
Join Date: Sep 2007
Posts: 844
Mein Auto: 1997 528i
Quote:
Originally Posted by putitupmike View Post
Error code says that both front banks are running lean. What is the first thing I should do?
There's no "both front". If just one bank then maybe not vac leak. If both then still maybe not vac, could be maf needs crc cleaner. Also check fuel trims real time, see if lean at say 3k rpm, if so then maybe not vac but fuel flow.
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  #6  
Old 10-30-2012, 06:50 AM
putitupmike putitupmike is offline
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Location: San Francisco, CA
 
Join Date: Jun 2012
Posts: 88
Mein Auto: 2001 525i wagon
Follow up. Sounds like my 525i... has a vacuum leak. At least that's where I will start. I hope cleaning it will be good enough as they are $250, and frankly I would rather just pay my kids rent. Mike, regarding your cars look, I think the red rims look great and especially when seen from the rear and you get some taillight in the photo. Anyway I will Google cleaning a MAF and get to work on it. Wish me luck, cuz lean or not... it''s just purring.
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  #7  
Old 12-08-2012, 03:12 AM
delorian delorian is offline
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Location: Stockholm, Sweden
 
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Posts: 40
Mein Auto: Bmw 528 98
Hi.

Any progress on this im about to replace my MAF but can't find any part number printed on it.

I dont think i have an airleak because i hear no noise when i take the oilcap of on idling or when i remove the dipstick.
Whats strange is that there is no difference in idle when disconnecting the MAF.


I will order a new one as soon as i can find a part number printed on it, its not printed on the top.

Mine looks like this but nothing is printed on it.
http://www.maf-shop.com/en/vdo-sieme...766a940685f8ae

Where do i find the partnumber on my MAF?
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  #8  
Old 12-08-2012, 06:15 AM
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tmvE39/E53/Z32 tmvE39/E53/Z32 is offline
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Mein Auto: 03 540, 06 E53 4.8, Z32TT
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Sound like you need a new MAF if it makes no different when it's disconnected.
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FS 2001 ///M5
http://www.bimmerfest.com/forums/sho...d.php?t=791509
2000 Dinan S1 //M5 (my DD) 06 DINAN E53 4.8iS (wife's DD), 90 Straman Z32TT (my pride & joy ride)

Gone, but not forgotten: 01 E53 3.0i, 01 525i Sport, 03 DINAN 540i MSport and 91 Z32TwinTurbo

Last edited by tmvE39/E53/Z32; 12-08-2012 at 06:18 AM.
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  #9  
Old 12-09-2012, 06:21 AM
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DHoang DHoang is offline
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Location: Austin, Texas
 
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Mein Auto: '98 528i, '82 323i
Quote:
Originally Posted by putitupmike View Post
Follow up. Sounds like my 525i... has a vacuum leak. At least that's where I will start. I hope cleaning it will be good enough as they are $250, and frankly I would rather just pay my kids rent. M Anyway I will Google cleaning a MAF and get to work on it. Wish me luck, cuz lean or not... it''s just purring.
if you suspect that you have an air leak, how does cleaning the MAF seal off the leak?

aren't u better off looking for a leak, like in between the accordion folds of the intake boot, per se?
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  #10  
Old 12-09-2012, 08:25 AM
poolman poolman is online now
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Location: martinsville va
 
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Mein Auto: 525i station wagon
Too cut to the short and sweet--check out the following--if you can DIY you can have ago and spot the area's that can cause your problems
http://www.bimmerfest.com/forums/sho...eaks+revisited
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