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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 01-09-2012, 10:23 AM   #1 (permalink)
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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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Old 01-10-2012, 03:53 AM   #2 (permalink)
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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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Old 01-10-2012, 01:36 PM   #3 (permalink)
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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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Old 01-10-2012, 02:33 PM   #4 (permalink)
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BTW it will run happily on standard unleaded.
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