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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 09-12-2014, 11:22 AM
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whytry whytry is offline
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Location: El Dorado Hills, CA
 
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Mein Auto: '06 750i, 68 Camaro
Replaced IVM from no start issue and now MPG sucks

As some of you remember I had that problme of intermittent no start issues. After lots of reading, some trial and error, and some help from members here I got it all fixed and so far its not having any issues at all. But since I changed the IVM my MPG has gone down from 19.8 mpg to 16.7 mpg. Nothing else has changed at all just the IVM, driving the same, distances I drive are the same, same route to work etc. Its mostly freeway too which probably why I'm a little more frustrated. I'm averaging about 350 miles a tank and about 21 gallon fillup. Where I used to get closer to 425 miles a tank on the same 21 gallon fillup. When I drive 35 miles to work each way that extra MPG really helps the pocketbook.

HAs anyone else had this? Does the car need to learn how I drive again or is there something I can do? I have reset the car data on Idrive. What does Fuel consumption do on the dash in the hidden menu do? I have held the button like to reset it but nothing changes..
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06 750i - Blk/Blk, Sport pkg, premium pkg, comfort access, ent pkg, convience pkg, 21's, had to sell (got divorced)
07 750LI - Blk/Blk, Sport, Premium, comfort access, rear DVD, convenience, sport 20's but want the 21's. - I'm back!!
68 Camaro - Procharged and injected LS2 in progress
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  #2  
Old 09-12-2014, 11:28 AM
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PAPER PAPER is online now
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Mein Auto: 745LI
Was it a new or used IVM ???
Hhhmm interesting that your gas
Mileage is affected

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  #3  
Old 09-12-2014, 11:31 AM
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whytry whytry is offline
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Location: El Dorado Hills, CA
 
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Mein Auto: '06 750i, 68 Camaro
Brand new from Dealer in Roseville.
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06 750i - Blk/Blk, Sport pkg, premium pkg, comfort access, ent pkg, convience pkg, 21's, had to sell (got divorced)
07 750LI - Blk/Blk, Sport, Premium, comfort access, rear DVD, convenience, sport 20's but want the 21's. - I'm back!!
68 Camaro - Procharged and injected LS2 in progress
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  #4  
Old 09-12-2014, 07:48 PM
meangreen94z meangreen94z is offline
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Location: Houston
 
Join Date: Jun 2010
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Mein Auto: 2004 BMW 745i sport
All an IVM is, is a panel with fuses and integral relays. It supplies 12v to all your engine related sensors, solenoids, injectors, etc. That's it. Its common for the contact in the internal DME main relay 2 to burn out. This will cause stalling and no starts, but it has nothing to do with long term engine performance/fuel economy. Either something else is going on or your driving habits have changed.
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  #5  
Old 09-12-2014, 07:54 PM
dvanlare dvanlare is online now
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Mein Auto: '95 840Ci, '05 745Li
Are you sure you didn't change any coding in MMI? That is almost exactly the delta between being in imperial (UK) vs. US gallon (factor of 1.2). US mode always shows lower MPG. I used to run at about 21 MPG in UK mode and have it back to US and am getting about 17.6 MPG.
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  #6  
Old 09-12-2014, 07:54 PM
meangreen94z meangreen94z is offline
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Mein Auto: 2004 BMW 745i sport
To reset long term fuel economy, go under the car data menu(NE menu in the Idrive), then go under BC(Board computer) and select whatever you would like to reset.
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  #7  
Old 09-16-2014, 10:25 PM
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whytry whytry is offline
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Mein Auto: '06 750i, 68 Camaro
Quote:
Originally Posted by dvanlare View Post
Are you sure you didn't change any coding in MMI? That is almost exactly the delta between being in imperial (UK) vs. US gallon (factor of 1.2). US mode always shows lower MPG. I used to run at about 21 MPG in UK mode and have it back to US and am getting about 17.6 MPG.

Yeah that I know of I haven't changed anything there in MMI.... How can I check this to make sure. The. Coding I have done to the car was before I was having this issue





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06 750i - Blk/Blk, Sport pkg, premium pkg, comfort access, ent pkg, convience pkg, 21's, had to sell (got divorced)
07 750LI - Blk/Blk, Sport, Premium, comfort access, rear DVD, convenience, sport 20's but want the 21's. - I'm back!!
68 Camaro - Procharged and injected LS2 in progress
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  #8  
Old 09-16-2014, 11:58 PM
dvanlare dvanlare is online now
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Mein Auto: '95 840Ci, '05 745Li
In MMI you would look for LAENDERVARIANTE_BNDB_MMI. ECE gives higher MPG versus US. Some people set both LAENDERVARIANTE_BNDB_MMI and FAHRZEUGTYP_MMI to ECE in order to disable the nav legal warning but you really only need FAHRZEUGTYP_MMI.
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