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6 Series DIY
6 Series Do It Yourself (DIY) forum.

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  #1  
Old 12-24-2011, 06:42 AM
meisterm meisterm is offline
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Location: Northern Virginia
 
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Mein Auto: 530i
Poor performance and gas mileage on M6

I bought a 2007 M6 about 3 months ago. I reset the average MPG and it appears to be getting about 8 MPG in easy country driving. I don't expect good gas mileage but 8 MPG is ridiculously low. I am driving it relatively easy as well. When I do step on the accelerator it doesn't seem to have the pep it should either. It only has 30,000 miles. Also, it's not throwing any codes. I looked at one of the air filters and it looks a little dirty so I'll replace both of them. Is there anything else I should look at?
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  #2  
Old 12-24-2011, 04:00 PM
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Yorgi Yorgi is offline
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Mein Auto: '04 M3 / '06 650i Cab
8 mpg is about what you should be getting during enthusiastic city driving in an M6 so it sounds like something is not right.

I would start by checking/replacing the standard MPG killers: air filter (done), spark plugs, fuel filter, CCV crankcase valve, O2 sensors. I would also drop in a can of Techron fuel injector cleaner in the next two gas tanks.
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  #3  
Old 02-17-2012, 03:20 AM
Blaknificent Blaknificent is offline
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Excellent checklist Yorgi!....where is the CCV valve located? Is it expensive to replace?

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  #4  
Old 02-17-2012, 09:15 PM
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Yorgi Yorgi is offline
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Quote:
Originally Posted by Blaknificent View Post
Excellent checklist Yorgi!....where is the CCV valve located? Is it expensive to replace?

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Part #13 in this diagram. VERY easy to replace and only about $15 each. Search the forums for DIYs.
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'02 Highlander - kid hauler
'01 330Ci - winter beater

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  #5  
Old 08-17-2013, 10:06 PM
crashmax03 crashmax03 is offline
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Location: Los Angeles
 
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Mein Auto: BMW M6 2007
Did you fix your problem?
I think I'm having the same problem.
I fill up the tank only with Chevron gas, I've put a can of Techron (in 2 gas tanks), I've cleaned the air filters.
My car has 97k miles. I have no idea what has been done so far on it.
I'm gonna check the sparkplugs but if you have any tips, I'll be glad to hear it :-)

Max.
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