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General E46 Forum
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Old 08-21-2011, 10:25 AM   #1
robnkate07
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Gas mileage

my 2003 325xi is getting really poor gas mileage... ive checked the usual, tire pressure, maintanence, etc... the car has 90k miles on it... Any thoughts?
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Old 08-21-2011, 10:27 AM   #2
//TRD power
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Tune up.
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Old 08-21-2011, 10:35 AM   #3
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What yard stick are using to measure your fuel usage. I would ask you if you have filled your tank and written down the mileage or reset your trip odometer and during a couple of days to really figure out exact fuel mileage. Secondly cleaning items like your MAF, IVC and TB can produce exceptional results. Just my two and a half cents worth...
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Old 08-21-2011, 10:37 AM   #4
robnkate07
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zchild: sorry, what is a maf, ivc and tb?
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Old 08-21-2011, 10:43 AM   #5
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Have you switched gas stations recently? Been driving more aggressive? Car feels more sluggish (thinking brake pad dragging)?

Few things drastically affect gas mileage. So let's start with a baseline - what's normal MPG and what are you getting now?
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Old 08-21-2011, 10:51 AM   #6
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Quote:
Originally Posted by robnkate07 View Post
zchild: sorry, what is a maf, ivc and tb?
Sorry I'm doing the freakin shop speak thing: Mass Air Flow sensor, Idle Control Valve and Throttle Body...
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Old 08-21-2011, 11:10 AM   #7
robnkate07
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Thanks zchild, I'll try those. @waynes world: i havent switched fuel or driving habits. Dot notice any dragging but i will pull the wheels... Are spark plugs and O2 sensor something I can do at home?
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Old 08-21-2011, 11:53 AM   #8
Zchild
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Quote:
Originally Posted by robnkate07 View Post
Thanks zchild, I'll try those. @waynes world: i havent switched fuel or driving habits. Dot notice any dragging but i will pull the wheels... Are spark plugs and O2 sensor something I can do at home?
They are very simple tasks, you can do spark plugs and O2 sensors in your driveway. I would suggest not using a torque wrench on your spark plugs, just tighten them till they are tight with the socket wrench. Both jobs can be completed in under two hours. You will need an O2 sensor socket to do the O2 sensors. Both jobs can be done from the top side of the bimmer as well.
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Old 08-21-2011, 12:02 PM   #9
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I just did my o2 sensors with no real noticeable gain in fuel mileage. I'm going to continue driving it as it might just have to clean the engine out after running rich for so long and hopefully see better results but so far not really.
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Old 08-21-2011, 12:23 PM   #10
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An easy way to tell if any particular pad is dragging is after a decently long drive (5+ miles), when you stop, put your hand in front of the wheel, at the top but not inside the wheel well where the heat from the rotors will come off. If any wheel feels particularly hotter than the one on the other side, investigate further.
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