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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 11-29-2012, 06:53 PM
azaps4890 azaps4890 is offline
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Location: michigan
 
Join Date: Nov 2012
Posts: 2
Mein Auto: 2003 525iT 1976 2002
P0313 after prolonged idle

Hi.
I know that this subject was probably already discussed somewhere, but never found a remedy for my specific issue.
Everything is fine, until car sits and idles for a few minutes. Engine will start running rough and check engine light comes on. I would turn it off and back on - runs just fine.
Already checked DISA, cleaned idle valve and whole intake, replaced iffy hoses and rubber.
New fuel filter as well. Car has 105K miles. Can it be an old fuel pump?
Thanks,
Eric
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  #2  
Old 11-29-2012, 08:19 PM
edjack edjack is online now
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 9,073
Mein Auto: '97 540i 6 speed
Get a fuel pressure gauge and observe the pressure when it occurs. You have a Schrader valve on the fuel rail which makes it easy to attach a gauge.

Get thee to Harbor Freight and buy the kit. Pressure s/b 50 psi+.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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  #3  
Old 11-30-2012, 11:39 AM
azaps4890 azaps4890 is offline
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Location: michigan
 
Join Date: Nov 2012
Posts: 2
Mein Auto: 2003 525iT 1976 2002
Thanks. I'll try that.
What baffles me is, that if it's a fuel pump - then the problems should appear when the demand is high (high RPM) versus low (idle).
Eric
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