Fuel Consumption Problems

bashtanu · 01-27-2006, 02:15 AM

Hello all,
I have big problems with the fuel consumption. It takes about 20l/100km inside town driving. I changed the lambda sensor as I heard that this could be the problem but I can see no difference in consumption Is the same....
Have any idea about what else could be the problem?
From what I read here this fuel consumption is not normal for this engine, is it? I have a 2.0L 8v abk 115bhp.
10x

**AllWheelGrip** · 01-27-2006, 04:25 PM

u got the air sensor so did u check ur plugs and injectors

bashtanu · 01-28-2006, 11:40 AM

I've been told that the temp sensor could be the problem, the one who comunicates with the ECU in order to determine the proper mixture when the engine is cold.The problem is that I do not know which is the temp sensor that comunicates with the ECU, because there are 2 of them, a blue one and a white one.
When you say air sensor do you refer at the MOF(mass air flow)?
The plugs are new...and I made a check on the computer and everthing seemed to be ok...
Beside this problem with the fuel consumption...the car is not running as it shoul be...it doesn't have as much power as it should have...
Any ideas about the problem??
10x

kb80 · 01-28-2006, 01:27 PM

hi
i had an 'alfa romeo 156' and they seemed prone to lambda, MAF and thermostat problems, dont know how the problems translate between different cars but
as far as i know...
MAF problems would lead to a loss of power and perhaps a bit of a rough idle, the way to check the alfa's maf was to just unplug it and see if the car ran any better....
a broken thermostat could cause a rich fuel mixture...
think a catalytic convertor thats on the way out could cause the lambda to overfuel aswell.

bashtanu · 02-06-2006, 01:48 AM

Well, I guess I found the problem...after a full check on a car service they say that the MAF is the problem and it needs to be replaced. A new one is to expensive for me, and I tried to find one from an old car..no succes yet though. I also cleaned the inside area of the MAF and a big change in how the car is running has made. The fuel consumption is not that big as it use to be, but I'm sure it can go lower after i'll change it.

Thanks all

gio · 10-05-2007, 02:40 PM

hi, i have 97 a4 1.8t quattro, it consumes 15l/100 km in a city and 12l on a highway. i tried many diagnostic tests, no fault codes, test values perfect, as it is mentioned in a repair manual. have no idea what to do. tomorrow i ll try thre last maf test on drive, hope that will be reason, but very doubtfull.

01-27-2006, 04:25 PM	#2 (permalink)
AllWheelGrip Super Moderator Join Date: Jun 2005 Posts: 1,725 Gallery: (0)	u got the air sensor so did u check ur plugs and injectors __________________ There are many paths to the top of the mountain but the view will always be the same

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01-27-2006, 02:15 AM	#1 (permalink)
bashtanu Newbie Join Date: Jan 2006 Posts: 10 Gallery: (0)	Hello all, I have big problems with the fuel consumption. It takes about 20l/100km inside town driving. I changed the lambda sensor as I heard that this could be the problem but I can see no difference in consumption Is the same.... Have any idea about what else could be the problem? From what I read here this fuel consumption is not normal for this engine, is it? I have a 2.0L 8v abk 115bhp. 10x

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01-28-2006, 11:40 AM	#3 (permalink)
bashtanu Newbie Join Date: Jan 2006 Posts: 10 Gallery: (0)	I've been told that the temp sensor could be the problem, the one who comunicates with the ECU in order to determine the proper mixture when the engine is cold.The problem is that I do not know which is the temp sensor that comunicates with the ECU, because there are 2 of them, a blue one and a white one. When you say air sensor do you refer at the MOF(mass air flow)? The plugs are new...and I made a check on the computer and everthing seemed to be ok... Beside this problem with the fuel consumption...the car is not running as it shoul be...it doesn't have as much power as it should have... Any ideas about the problem?? 10x

01-28-2006, 01:27 PM	#4 (permalink)
kb80 Newbie Join Date: Jan 2006 Posts: 7 Gallery: (0)	hi i had an 'alfa romeo 156' and they seemed prone to lambda, MAF and thermostat problems, dont know how the problems translate between different cars but as far as i know... MAF problems would lead to a loss of power and perhaps a bit of a rough idle, the way to check the alfa's maf was to just unplug it and see if the car ran any better.... a broken thermostat could cause a rich fuel mixture... think a catalytic convertor thats on the way out could cause the lambda to overfuel aswell.

02-06-2006, 01:48 AM	#5 (permalink)
bashtanu Newbie Join Date: Jan 2006 Posts: 10 Gallery: (0)	Well, I guess I found the problem...after a full check on a car service they say that the MAF is the problem and it needs to be replaced. A new one is to expensive for me, and I tried to find one from an old car..no succes yet though. I also cleaned the inside area of the MAF and a big change in how the car is running has made. The fuel consumption is not that big as it use to be, but I'm sure it can go lower after i'll change it. Thanks all

10-05-2007, 02:40 PM	#6 (permalink)
gio Newbie Join Date: Sep 2007 Posts: 16 Gallery: (0)	hi, i have 97 a4 1.8t quattro, it consumes 15l/100 km in a city and 12l on a highway. i tried many diagnostic tests, no fault codes, test values perfect, as it is mentioned in a repair manual. have no idea what to do. tomorrow i ll try thre last maf test on drive, hope that will be reason, but very doubtfull.

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