Drop in MPG '04 325i - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 01-09-2012, 11:23 AM
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Drop in MPG '04 325i

My '04 325i had a drop in MPG from 19.5 to 15.1 last week. At first I thought it would be the drop in weather we had here in South FL last week but this hasn't happen in the past. Here's some basic info:

Milleage: 116K
Fuel filter changed 6 months ago
Spark plugs changed at 100K miles
Air filter/cabin air filter regulary changed
Premium unleaded always used

Car feels find driving. I don't think it would be the e-brake because there's no slugish feel.

Thanks!
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#2 (permalink) Old 01-10-2012, 04:53 AM
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Have you checked your air flow sensor, it may have a build up of crud on it, you can get specialised cleaners, and normally they aren't too hard to remove.


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#3 (permalink) Old 01-10-2012, 02:36 PM
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Nope - didn't think of that. After my initial research I thought it could be one of the pre-cat O2 sensors (4-6 cyl) but this would be a good start. I'm going to hook up a code reader this weekend to see if I get any falut codes. Thanks brettski!
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#4 (permalink) Old 01-10-2012, 03:33 PM
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BTW it will run happily on standard unleaded.


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