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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 11-23-2012, 09:41 AM
esoes06 esoes06 is offline
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Location: TURKEY
 
Join Date: Sep 2012
Posts: 16
Mein Auto: E39 528i
my new car e39 528ia and problems

I cihan turkey.
E34 520i sell your old car.
I bought a new car e39 528ia
model, chassis number 1998 br39301
but I have a problem, flow meter constantly on the move.
acceleration problem.
video narration.
4. gear and 5th gear a lot of power loss.
4.gear full power max 22 liter
with constant gas flow meter gauge tachometer constantly moving.
and drive low
5. Pressing the full power shift, but 12 or 14 liters max flow meter
curved path

I do not know much english
sorry

video link


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  #2  
Old 11-25-2012, 04:08 AM
esoes06 esoes06 is offline
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Mein Auto: E39 528i
???
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  #3  
Old 11-30-2012, 12:56 AM
esoes06 esoes06 is offline
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Mein Auto: E39 528i
no answer
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  #4  
Old 11-30-2012, 04:21 AM
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Fudman Fudman is offline
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Location: Sudbury, MA
 
Join Date: Apr 2007
Posts: 6,225
Mein Auto: '02 530i Sport auto
I believe, if I understand the problem, is that you have a vacuum leak.

The "flow meter" is simply a vacuum gage attached to the intake manifold and is calibrated to reflect the gas consumption of the engine. Simply put, when you step on the gas, it reflects a lower gas mileage. At steady state throttle, it reflects higher gas mileage. This should coincide with your tachometer reading (higher rpm = lower gas mileage, lower rpm = higher gas mileage). In your video, your tachometer is at steady state (~2K). Your gas consumption (flow meter) should also read steady state (with a high gas mileage reading). However, it seems to fluctuate. This indicates that the vacuum within the system is fluctuating, meaning a vacuum leak.

Finding a vacuum leak is an entiorely different issue. Do a search on vacuum leaks. I would guess that your intake is leaking after the MAF and before the manifold. Look there first.

Good luck! And report back what you find.
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  #5  
Old 11-30-2012, 04:35 AM
esoes06 esoes06 is offline
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Location: TURKEY
 
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Posts: 16
Mein Auto: E39 528i
is yes. the problem did not occur to anyone that the vacuum
How to detect the vacuum leak.
What materials should be checked
the intake manifold and hoses other than
Pressure control valve doubt

where bi can be damaged when installing the LPG system
fitted to me by the previous owner
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  #6  
Old 11-30-2012, 04:44 AM
esoes06 esoes06 is offline
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Location: TURKEY
 
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Mein Auto: E39 528i
until the end of the accelerator pedal is pressed
car and the road sloped down very slowly gaining momentum
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  #7  
Old 11-30-2012, 05:58 AM
vavet5308 vavet5308 is offline
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Location: Mechanicsville, VA
 
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Posts: 519
Mein Auto: 2002 525it
It's difficult to troubleshoot a car from afar. It's even more difficult when there are undocumented modifications, such as the LPG system, made by a previous owner of the car.

I think Fudman is right, there is a vacuum leak somewhere, or perhaps it's something with that LPG system. Can that system be easily removed or disabled?

A common technique to find a vacuum leak is to use a smoke machine to pressurize the intake system with the engine not running. Watch closely for the place where the smoke escapes. This is the vacuum leak.
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  #8  
Old 12-09-2012, 02:54 AM
esoes06 esoes06 is offline
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Location: TURKEY
 
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Mein Auto: E39 528i
catalyst has been cleared.
with another flow meter flow meter was tested and changed.
potentiometer is renewed.
diagnosis was tested several times.
Injectors were tested.
the cam sensor, crank sensor was tested.
but the problem continues.

not only changed the lambda sensor and the ECU.

This problem could not be related to the lambda sensor and ECU
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