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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Oct-15-2010, 07:58:14 PM   #1
xekrete36
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Default Fuel consumption

For the past couple of days I noticed that my E36 M3 gas consumption is off the roof. It is using more gas than my E46 M3 on a commute with the occasional stomp on the pedal. It threw a couple of codes the other day that it had previously, the P0455 and the P1250. I searched and found that the 0455 is the code for a big vacuum leak, first thing was the gas cap but it is still in good condition so I decided to check the little tank behind the rear passenger wheel well. I take it out and one of the connections on top was broken. I could smell some gas fumes yesterday when I was putting the license plate on it. Could this be why it is using so much fuel? I replaced the plugs a couple of weeks ago also.
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Old Fri, Oct-15-2010, 09:34:23 PM   #2
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Have you been checking your engine temperature gauge? Is the engine staying abnormally low and not reaching proper operating temp? If so, it's likely a bad/stuck t-stat, causing the excessive fuel consumption.
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Old Fri, Oct-15-2010, 09:49:28 PM   #3
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Originally Posted by SIDEWAYS View Post
Have you been checking your engine temperature gauge? Is the engine staying abnormally low and not reaching proper operating temp? If so, it's likely a bad/stuck t-stat, causing the excessive fuel consumption.
Even when I bought my 98 M3 with a broken (literally broken in half) thermostat, the car got a consistent 23mpg (OBC) and drove it like that for a month before I did the cooling system. I know it wasn't the best but it was my only car
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Old Fri, Oct-15-2010, 10:26:16 PM   #4
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Originally Posted by SIDEWAYS View Post
Have you been checking your engine temperature gauge? Is the engine staying abnormally low and not reaching proper operating temp? If so, it's likely a bad/stuck t-stat, causing the excessive fuel consumption.
I watch my temp gauge like a hawk since I recently bought the car and not know what to expect yet, but so far the temp has been where it normally should be. I know I am not getting 23mpg. I replaced the plugs with the old one's today and it seems the same.
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Old Fri, Oct-15-2010, 11:08:37 PM   #5
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the temp gauge cannot be counted on since it's not linear...... I believe the lower bound for 12oclock is 130F and I dunno the upperbound to make it go opast 12oclock

guys with actual temp gauges, can you chime in here?
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Old Sat, Oct-16-2010, 03:39:45 AM   #6
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So has the consumption changed since you bought it? Have you actually calculated it yet?
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Old Sat, Oct-16-2010, 05:47:38 AM   #7
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Sorry, no way (unless your commute was all highway) you got 23mpg with a bad tstat.
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Old Sat, Oct-16-2010, 06:04:06 AM   #8
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So a little while ago I got on my car and started it up to go somewhere and noticed that the fuel needle was higher than what it was last time I used the car. I'm thinking I have a bad fuel level sensor. The car did throw a CEL code of p1250 which is fuel level too low. It's just playing games with me then.
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Old Sat, Oct-16-2010, 03:05:32 PM   #9
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So a little while ago I got on my car and started it up to go somewhere and noticed that the fuel needle was higher than what it was last time I used the car. I'm thinking I have a bad fuel level sensor. The car did throw a CEL code of p1250 which is fuel level too low. It's just playing games with me then.
Were you parked on a hill when you turned the car on?
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Old Sat, Oct-16-2010, 04:03:32 PM   #10
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Were you parked on a hill when you turned the car on?
And no, he is not joking by asking this.

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Discussing Fuel consumption in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)