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Old 11-23-2013, 05:29 PM   #1
eyelevel
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My e30 325e is not economical

I have a 1987 e39 325e and I get 390km/tank of gas.
The fuel consumption indicator goes to the extreme when I accelerate and goes to zero (sometimes) when I let off the gas. put in a new O2 sensor. Would changing the cluster fix it. Does anyone know what controls this operation. Vacuum system?
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Old 11-24-2013, 12:09 AM   #2
frankie591
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no the cluster wouldn't do anything. Check for vacuum leaks, read your plugs to see if you have a stuck open injector are some of the first things you should do

FYI in my 325i at no throttle my fuel economy gauge reads zero, when I give any amount of throttle the gauge shoots up to 40l/100k and stays there lol
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Old 11-24-2013, 01:19 AM   #3
JohnnyK
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I feel compelled to chime in as I hunt for seats.

The mileage gauge SHOULD read 0mpg when you're not moving. No codes? Vacuum leak would probably cause a funky idle.

ANd I'm not sure about your BMW's specifically, but it's probably a combination of vacuum and VSS that controls that (Just a guess). When vacuum is high and VSS is reading 0, it knows you're at 0 mph, and mileage should read 0. What IS your vacuum at idle?
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Old 11-24-2013, 04:53 AM   #4
ac_2007
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sounds like the gauge is working exactly as it should. its showing you instantaneous (estimated) fuel mileage based on your throttle position.

MPG/ liters per KM is an average.
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Old 11-24-2013, 08:54 AM   #5
Ceeker
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Gauge is functioning normal. ^^^
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
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
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 01-14-2014, 12:11 PM   #6
estoguy
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Check for vacuum leaks. I'd also recommend running some SeaFoam through your car, gas and intake. Have you checked your ignition components? I'd pull the spark plugs too to see what they look like - could indicate a problem.

I have owned an Eta for over a year, and my total average has been 7.6L/100 KM. I've gotten it below 7 during warmer months on long drives. The winter kills the efficiency by about 15%. Right now, running around 8L/100 Km.
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Old 02-13-2014, 01:22 PM   #7
bmr999
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I have a very similar problem with '89 325ix, except my gauge at idle does not sit low (0 L/km) my sits off the charts at the high end of the scale. I am looking at swapping the AFM to see if that solves the problem. If I learn anything I'll post some results.
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Old 02-13-2014, 02:29 PM   #8
Eurostyle
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Quote:
Originally Posted by bmr999 View Post
I have a very similar problem with '89 325ix, except my gauge at idle does not sit low (0 L/km) my sits off the charts at the high end of the scale. I am looking at swapping the AFM to see if that solves the problem. If I learn anything I'll post some results.
This is normal, when you are not moving, your gas consumption is 100%...
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Old 02-15-2014, 02:33 PM   #9
bmr999
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Thanks euro now that I think of it that is spectacularly obvious.
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