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Old 12-08-2010, 09:29 PM   #1
Another BM
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325e Gas consumption is out of control

So from what i understand is that the "e" is suppose to stand for economy.
It seems like it stands for "e"xpensive in my case.

This car is a pig on gas. i get about 260km out of a full tank.
I checked for gas leaks, can't find any..


Any suggestions on where i should start?
Thanks
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Old 12-08-2010, 10:41 PM   #2
Ihavenocar
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brake drag ? intake ? filter change ? bad traction ? high diff ratio?
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why do u think Germans make cars... theyre not allowed to make tanks any more lol.
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Old 12-08-2010, 10:44 PM   #3
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or heavy foot
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Old 12-08-2010, 11:19 PM   #4
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^^no heavy foot would account for that kind of horrible mileage. I've posted in other parts of Max, that I get 400+ km/tank at the race track or while towing with my 325i, so you should be at least getting better than that. Normal day to day I go 600+ km/tank with some of my better tanks in the low 700km/tank range. ^^

You'll save a small fortune by taking it to a mechanic at that rate!
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Old 12-09-2010, 12:45 AM   #5
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or heavy foot
LOL, this car has 127hp...
a heavy foot is just as useful as a light foot
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Old 12-09-2010, 04:06 AM   #6
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Mine is a little pig as well, I'm suspecting an O2 sensor? Other then that I can't tell ya. I've changed the oil, oil filter, air filter, Seafoamed the car.

Next, after O2 change, is to check the injectors?
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Old 12-09-2010, 06:29 AM   #7
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Like the others have said, check the oil filter, air filter, check oil colour. I would start at the fuel filter, because it may not have been taken care of in a while, and should be done anyway. Also O2 sensor may contribute to your issue, but not that much. I have to replace an O2 sensor, and it doesn't seem to do a huge amount of damage to my fuel consumption.

A heavy foot along with a high diff ratio may burn a lot of fuel. I can kill a lot of gas in my 318 by beating on her real good.
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Old 12-09-2010, 07:55 AM   #8
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curious as to what you eta drivers are getting on the hwy? my 85 eta at 100 km/h is drinking gas at 6.7L-7.2L/100, that is according to the OBC. in city, its more like 9.8-10.4L/100. havent done a tuneup on it yet since i aquired it.
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Old 12-09-2010, 10:13 AM   #9
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how about a good o'l fashion tune up; plugs, cap and rotor, filters. air,fuel etc. also worn injectors will decrease fuel economy. a bad O2 sensor will probably cause more obvious issues - poor running - bad smell (rotten eggs) and of course the obvious - drive clean time will indicate this by the readings.
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1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
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latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 12-09-2010, 02:54 PM   #10
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curious as to what you eta drivers are getting on the hwy? my 85 eta at 100 km/h is drinking gas at 6.7L-7.2L/100, that is according to the OBC. in city, its more like 9.8-10.4L/100. havent done a tuneup on it yet since i aquired it.
Holy shit man, I'm lucky if I keep it under 13L/100km.
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Old 12-09-2010, 03:46 PM   #11
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I would run it till the warning light comes on... then put say 10L in... reset odo, then run till the light comes on again. Record odo, do math. I think my old ETA with no O2 sensor was getting mid to high 8's/100 on the highway.

My 325i is doing extremely well on the highway, I have MAF conversion and newer 19lb injectors with custom tune and a 2.79 LSD. Now that I have my winter tires on... I expect it could be slightly better.
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Old 12-09-2010, 03:59 PM   #12
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^^ i run 185/14's winter tires currently. less friction and rolling resistance.
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Old 12-09-2010, 05:49 PM   #13
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My 325e is experiencing the same problems. I suspect its either the injectors or in need of a valve adjustment since I've replaced virtually all the sensors and filters. I even tried a new DME and afm.
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Old 12-09-2010, 07:42 PM   #14
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My eta wasn't that bad but getting there. After doing an "i" swap recently I account some horrible mileage. Its time for wheel bearings (spin each front wheel they stop almost immediately).
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Old 12-10-2010, 11:22 AM   #15
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Cold weather, winter tires and short city trips really kills fuel mileage. If your car never gets up to operating temp (maybe 10-15 minutes of city driving in this weather) then that mileage wouldn't surprise me for an i. For an e.... sound a bit high.

Start with a regular tune-up if you're due anyways, and then take a look at thermostat, O2 sensor, and vac leaks.

Unless the brakes are *REALLY* stuck on hard and it's more than just one, it's a minor increase in fuel consumption (this is from personal experience).

Cam... are you sure it's wheel bearings? Bearings tend to spend more freely when worn, but they'll have too much play and generate much more heat while in use which can lead to the bearing seizing.
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