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Old 09-22-2013, 01:47 PM   #1
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Join Date: Sep 2013
Location: Tanzania
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My 320i E46 is a guzzler!

Please help,

I have had an E46 320i sedan of 2003 for a year now. It is a fantastic car with 17-inch M sport tires, sports suspension and leather seats.

The car consumes about i litre for 4.5km (about 10mpg). It is bad. I am light footed and drive ca. 80km/h for most time. I have done a quick diagnostics test and it returned code p 1347 (misfire cylinder 3 and fuel cutoff cylinder 3). I cleared the code. No check engine light (it turned on and went off after driving 10 km). The misfire, if any, is imperceptible. the car shakes a little in when idling with air conditioning off. The car exhaust smells of fuel when the engine is cool and none when it has heated.

The car does NOT emit smoke, but hesitates a little when ascending hills.

Please help! I can hardly keep up with fuel cost now.
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Old 09-22-2013, 06:44 PM   #2
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Did the code come back after you cleared it?
You could try swapping the coil pack from a different cylinder and see if the problem moves.

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Old 09-22-2013, 07:23 PM   #3
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Can your scanner read fuel trims? If it does, post it!
Take a look at the spark plugs, if they are black and sooty, the engine is running too rich.
Measure fuel pressure, if too high it can cause rich running.

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"Would the codes indicate if it's the carburator?"
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Old 09-22-2013, 09:50 PM   #4
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My 320i E46 is a guzzler!

Could be your oxygen sensors. My 320i gets 8L/100KM so yours is definately running rich.

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Old 09-22-2013, 11:05 PM   #5
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My Ride: E90 330i, E36 328i
it should be 3 times of what youre getting right now
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bad mpg., low mpg, p 1347

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