ss2115
03-04-2021, 08:28 PM
Hi.
For some time now, my dash reading of fuel consumption has never tallied with the actual.
My dash usually reads between 15 and 16.5 liters per 100klms while my actual (ie: fill-up, make the liters/klms traveled calculation) is usually around 12 - 12.5.
I've Torque installed on my android media display and a matching Blutooth OSDII plugged in and I've observed my Long Term trim is 3.48 and 2.78 while the STT usually hovers around 0.770 up to 1.1 or so.
My actual problem though is I've used the hidden menu hack to try changing my fuel multiplier, but it doesn't matter if I'm down around 780 or if I'm up at 1200, the fuel display when reset starts around the 12l/100k but over a tank still ends up displaying around 16 - 16.5. Its quite weird because you would expect in one direction my consumption would be understated and in the other direction overstated. Yet it always comes out the same.
I've used a laptop with the BMW OBDII software and I don't have any error codes. (I thought maybe the O2 sensors might be out of range) but no errors. The MAF is only about 2.5 years old.
Additionally, in Torque when driving is tells me the engine is in closed loop and when the O2 sensors are being observed, they swing correctly back and forth between about 0.1 to 0.85 or so.
ie: I don't think its my O2 sensors casing the problem although to my knowledge, they have never been replaced.
How can it be when I do the actual calculations and it comes out much lower than being displayed anyway - ie: if the O2 sensors were to blame, my actual measured figures would show high fuel consumption.
Any advice on how to correct this would be greatly appreciated. Its not so much that I'm a careful or frugal driver or such - its more than I'd like my fuel range remaining to be accurate.
Car is a late 2002 E39 530i s/wagon. No engine mods. Its in great condition and has only 135,000 genuine klms on it. I'm the second owner.
For some time now, my dash reading of fuel consumption has never tallied with the actual.
My dash usually reads between 15 and 16.5 liters per 100klms while my actual (ie: fill-up, make the liters/klms traveled calculation) is usually around 12 - 12.5.
I've Torque installed on my android media display and a matching Blutooth OSDII plugged in and I've observed my Long Term trim is 3.48 and 2.78 while the STT usually hovers around 0.770 up to 1.1 or so.
My actual problem though is I've used the hidden menu hack to try changing my fuel multiplier, but it doesn't matter if I'm down around 780 or if I'm up at 1200, the fuel display when reset starts around the 12l/100k but over a tank still ends up displaying around 16 - 16.5. Its quite weird because you would expect in one direction my consumption would be understated and in the other direction overstated. Yet it always comes out the same.
I've used a laptop with the BMW OBDII software and I don't have any error codes. (I thought maybe the O2 sensors might be out of range) but no errors. The MAF is only about 2.5 years old.
Additionally, in Torque when driving is tells me the engine is in closed loop and when the O2 sensors are being observed, they swing correctly back and forth between about 0.1 to 0.85 or so.
ie: I don't think its my O2 sensors casing the problem although to my knowledge, they have never been replaced.
How can it be when I do the actual calculations and it comes out much lower than being displayed anyway - ie: if the O2 sensors were to blame, my actual measured figures would show high fuel consumption.
Any advice on how to correct this would be greatly appreciated. Its not so much that I'm a careful or frugal driver or such - its more than I'd like my fuel range remaining to be accurate.
Car is a late 2002 E39 530i s/wagon. No engine mods. Its in great condition and has only 135,000 genuine klms on it. I'm the second owner.