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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-22-2013, 12:47 PM   #1
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Join Date: Sep 2013
Location: Tanzania
Posts: 1
My Ride: E46 Sedan
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, 05:44 PM   #2
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Join Date: Jan 2011
Location: Newcastle, NSW
Posts: 71
My Ride: 2002 320Ci
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.

Watch this video:
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Old 09-22-2013, 06:23 PM   #3
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Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
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.

GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
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Old 09-22-2013, 08:50 PM   #4
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Join Date: Jan 2006
Location: Canada
Posts: 1,160
My Ride: 2002 BMW 320i
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, 10:05 PM   #5
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Join Date: Nov 2008
Location: Toronto, Canada
Posts: 598
My Ride: E90 330i, E36 328i
it should be 3 times of what youre getting right now
98bimmer is offline   Reply With Quote

bad mpg., low mpg, p 1347

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