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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 11-26-2010, 01:06 PM
charlespj charlespj is offline
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Location: germany
 
Join Date: Nov 2010
Posts: 8
Mein Auto: 520i 1997
Over active MPG energy gauge

Hi everybody, I have seen recently that the gauge at the bottom of the tacho gauge, its the gauge bmw call the energy gauge, On my 1997 520i this gauge is acting strange, and its not due to more action witn my right foot. I see that the needle moves completly over to the right on very gentle throttle movement, and on slowing down towards a stop, the needle go,s to zero and when stoped rise,s again to 10ltr/100 and after 5 or 6 seconds returns to zero again. Do,s anybody Know where this gauge gets it,s reading,s from, after all it,s just a flash vaccum gauge YES ?? PS have no vaccum leaks
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  #2  
Old 11-26-2010, 01:34 PM
edjack edjack is offline
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Location: San Jose, CA
 
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Mein Auto: '97 540i 6 speed
As I understand it, the gauge is tied to fuel injector duty cycle.
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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 11-26-2010, 01:45 PM
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bmw_n00b13 bmw_n00b13 is offline
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Location: Cambridge, ON
 
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Mein Auto: 99 528iA
It's computerized, and directly tied to the fuel injection system. It's a common phenomenon when stopping; I think it's because the car uses almost no fuel while braking but uses a bit while idling to keep the engine turning over.
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'99 528i ('98/12 build). 174,000km BY29428/Royalrot
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  #4  
Old 11-26-2010, 01:51 PM
edjack edjack is offline
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Location: San Jose, CA
 
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Mein Auto: '97 540i 6 speed
The fuel is completely cut off while coasting. It turns back on at about 800-1000 RPM.

The MPG gauge is fully to the left when coasting, which is an "undefined" area - no calibration marks. As the car slows, the gauge will swing over to a finite reading. With a manual trans, one can actually feel the cut-in.

I don't know how the l/km gauge works, probably opposite to the MPG meter.
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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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  #5  
Old 11-26-2010, 02:08 PM
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bmw_n00b13 bmw_n00b13 is offline
Freude am Fahren
Location: Cambridge, ON
 
Join Date: Feb 2008
Posts: 6,372
Mein Auto: 99 528iA
Same gauge, different numbers.
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'99 528i ('98/12 build). 174,000km BY29428/Royalrot
Breaking My Wallet since 2009
Mods: Stoptech SS brake hose, 280piece toolkit resting on trunk floor, Beisan VANOS seals
'99 540i (grandfather's)

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  #6  
Old 11-26-2010, 11:39 PM
charlespj charlespj is offline
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Location: germany
 
Join Date: Nov 2010
Posts: 8
Mein Auto: 520i 1997
Thanks Guy,s that,s a great help, so realy i have nothing to worry about then ? . As i am paranoid, about this dam gauge, as i have so many problems recently, with high fuel consumption. My cam and crank sensor wiring at the connector ends, the wires were touching together as the as the outer cover of each wire was gone, and in the end of checking everything on the inlet side, i found a complety blocked ccv. I think i will put some tape over this gauge and drive and see now what my fuel consumption is. Many thanks.
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  #7  
Old 07-31-2014, 08:54 AM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,088
Mein Auto: 02 BMW 525i M54 auto 130K
See also this BMW instrument cluster training PDF found in this thread:
- How does the instrument cluster fuel economy mpg gauge work (1)
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will 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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