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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
11-29-2012, 12:07 PM
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Air fuel mixture? Bogging feeling
2001 525i
The plugs were replaced probably 25k miles ago not sure what brand. So when I drive at lower rpms I get a bogging feeling. Usually when cruising between 35-40mph. The get up and go from a stop I do not feel it. Not sure what exactly the issue is I have no check engine lights on. I have had the issue for a while but it's recently annoyed me more and want to figure it out. I was thinking air fuel ratio issue/lack of a strong enough spark? I dont think it's the tranny or susp. Just feels like an old carbuerated car with its mixture off at times. Ideas? Sent from my DROID2 using Bimmer App 
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#2
11-29-2012, 02:28 PM
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DISA valve? Or vacuum leak.
__________________
 1995 525i 5 speed - sold at 225,000 miles 2002 530i 5 speed - 151,000 miles
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#3
11-29-2012, 02:39 PM
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Go here and compare your symptoms: www.beisansystems.com
__________________
 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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