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7 Series - E38 (1995 - 2001)

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  #1  
Old 04-18-2013, 08:02 PM
Linseman Linseman is offline
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Location: MA
 
Join Date: Dec 2011
Posts: 8
Mein Auto: 740il
Mpg Gauge

I seem to have some type of air flow problem. When slowing the car down, the mpg gauge spikes up to the 8 and then quickly spikes back to the left. This has been happening for a couple months now, and my gas mileage has decreased dramatically. I have changed an o2 sensor, air flow sensor, plugs and air filter. No lights on the dash.

Does it sound like I'm doing damage by continuing to drive this way?

Had my mechanic take a look and he can't find anything, including vacuum leaks.

Any possible suggestions would be helpful.


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  #2  
Old 04-18-2013, 08:32 PM
setconstr setconstr is offline
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Location: los angeles
 
Join Date: Feb 2008
Posts: 407
Mein Auto: 2001 740i sport 2006 m6
Well your MPG gauge chances every second your driving it increase as you lift off and decreases as you step down so it showing your milage at that exact second of movement or to throttle response has really nothing to do with your overall milage..
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Old 04-18-2013, 09:34 PM
Linseman Linseman is offline
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Location: MA
 
Join Date: Dec 2011
Posts: 8
Mein Auto: 740il
Mpg Gauge

I do understand that. Just a change I have seen is that as I am on the brake, the mpg gauge moves towards the 8 (right) and then spikes down to the left right before it comes to a stop.


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