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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 04-12-2011, 08:55 AM
JaimeRojas JaimeRojas is offline
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Location: Los Angeles
 
Join Date: Jan 2008
Posts: 15
Mein Auto: E39
Unhappy 2003 525IT-Smog Failed

Took the car for smog inspection- and failed... Technician suggested I change the MAS to begin with. I did, now however; my CEL is on and DTC's are as follows: P0313 -Misfire Det. w/low fuel, P0175- system too rich (bank 2), P1343- Manufactured specific code, P0172 - sytem too rich (bank 1), and P0102 Mass or Volume Air Flow Circuit Low input.

Is this a sign that my sensors are bad? Does anyone know what I should begin with.
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  #2  
Old 04-12-2011, 09:35 AM
Takechan Takechan is offline
E39 fanboi
Location: Scandinavia
 
Join Date: Mar 2009
Posts: 244
Mein Auto: BMW E39 520i (M52B25)
Check for vacuum leaks and the MAF. The rest "might" go away if you fix that.
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Old 04-12-2011, 11:02 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by JaimeRojas View Post
Took the car for smog inspection- and failed...
You 'might' find hints in this (still nascent and unfinished) thread:
- How to diagnose a typical BMW E39 engine misfire (1)

That thread, which is a summary of scores of misfire threads, has all the culprits nailed down; but it still needs a lot more on the diagnostic side.

In addition, to the OP, please post your smog results to this thread:
- Please post your E39 emissions smog test results
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Old 04-12-2011, 02:02 PM
Jimmys 530i Jimmys 530i is offline
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Location: Conyers, GA
 
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Mein Auto: 2003 530i
Check for vacuum leaks. Buy a small propane tank, and run a long hose off the end; open the valve just slightly, and hold the hose over vacuum components one at a time. If your idle changes, you have found your leak.
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  #5  
Old 04-12-2011, 02:33 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
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Quote:
Originally Posted by Jimmys 530i View Post
Check for vacuum leaks. Buy a small propane tank, and run a long hose off the end; open the valve just slightly, and hold the hose over vacuum components one at a time. If your idle changes, you have found your leak.
I'll add that to the misfire thread ... but ... may I ask ... (a serious question).

Q: What happens if there is an inadvertent spark while the engine is running?

Does it just 'puff' and go away or is there a boom?
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Old 04-12-2011, 08:39 PM
Jimmys 530i Jimmys 530i is offline
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Location: Conyers, GA
 
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Mein Auto: 2003 530i
Quote:
Originally Posted by bluebee View Post
I'll add that to the misfire thread ... but ... may I ask ... (a serious question).

Q: What happens if there is an inadvertent spark while the engine is running?

Does it just 'puff' and go away or is there a boom?
There is no source of ignition under the hood, and even if there was, the amount of propane is very small so nothing will happen. One of my friends is a factory trained tech, and he told me this is the method the dealer uses.
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