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BMW 3-Series (E90 E92) Forum
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Computer MPG Issue
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01-03-2015, 10:48 AM | #1 |
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Computer MPG Issue
Hi everyone, Some of you may be aware that awhile ago i had an issue with my MPG i was only averaging 15-17mpg in my 335D, i was advised to check the operating temperature and sure enough it wasn't getting up to temp 60-72 was where it was at, changed both thermostats with genuine BMW items and sure enough my MPG improved but only slightly to an average of 24mpg on board computer.
I have been to see Steve at A1BN and he was very helpful and run a in-depth diagnostic for me and the only fault showing was the fuel filter, I changed that and cleared the code and it has not shown back up. I went back to see him as he recommend doing an Engine parameter reset but unfortunately my car for some reason will not give him option to do so. Ive since been manually calculating my MPG by brimming the tank and letting it run down to quarter and refilling to full noting down my miles covered on that tank of fuel and using Litres to gallons conversions then divided the miles covered by gallons used and sure enough its been totally different to my on board figure. 1st tank i averaged 34.5MPG covering 352 miles 2nd tank i averaged 35.2MPG covering 360 miles 3rd tank i averaged 29MPG covering 334 miles i had been giving it some torture on that tank Each time the on board computer was showing 22-25 MPG no matter how carefully i drive it, soon as i accelerate from a roundabout up to 60-70 manually changing gear with the paddles in D so it doesn't rev past 2.5k it just drops like a lead ballon and the figure wont go back to what it should be showing, just stays low. I know something has happened as when i bought the car back in January last year i was chuffed to but with it it was always in the high 30's obviously got more confident in it so that dropped slightly but even when i did a few 0-155mph run I've got videos of the of the trip showing 29 average, if i do 200 miles now and then do a 0-100 when the current average is say 26 the average will just drop right down to 20-22 even after covering 200 miles Apologies for the long read but, I'm kind of lost on what i can do next? Any help would be appreciated. Regards Dan
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206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition Last edited by Dan-; 01-03-2015 at 11:13 AM.. |
01-03-2015, 11:01 AM | #2 |
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well i suppose the plus is you havent burnt as much cash as you thought on petrol
very annoying that the MPG on the dash is incorrect. i always wonder how accurate it was because on a 320i mine averages about 22-25 which im sure is incorrect on a 2 litre. Ill be very interested to know the answer to this. maybe there is someway of calibrating it :/ |
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01-03-2015, 11:08 AM | #3 |
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That is a bonus, I sold my 550bhp Impreza to buy this as i was getting fed up with the 12-15mph it was returning on my long drive to work, and now everyone keep reminding me that I've got a diesel and its not much better.
Hopefully there is that someone will know.
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206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 11:19 AM | #4 |
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Im not sure how many people would have done this and have current Mpg showing
i know a car that will do that speed obviously isn't going to average 30mpg at these speeds but 10 surely thats not normal? Private Road
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206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 11:31 AM | #5 | |
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Can you not reset the OBC? As in a factory reset using Bmwhat App or summut.. |
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01-03-2015, 11:35 AM | #6 | |
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Ive trield looking through all the BMWhat app functions can see nothing
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206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 11:47 AM | #7 |
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Will also note i have also had a new battery fitted and coded correctly as mine was failing so i though maybe its thats causing a few issues.
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206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 12:15 PM | #8 | |
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Very strange problem you are describing
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2009 E92 335d M-Sport 1990 E30 2.8 m52b28 conversion |
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01-03-2015, 12:25 PM | #9 | |
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I've turned off instant mpg off and that did the reset :/ Very strange, literally scratching my head, I even have to turn 2nd window in idrive to display nav and digital speedo in my speedo cluster so i cant see my mpg figure
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My Previous Cars
206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 12:31 PM | #10 |
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Are you referring to instant MPG figures or Average MPG figures?
And are you saying that your average MPG figures are lower than actual brim to brim average mpg?
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01-03-2015, 12:38 PM | #11 |
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Im referring to Average figure Sam, your 2nd line is correct
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206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 12:40 PM | #12 |
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In that case, I will give you a hint.
Search for hidden menu. Find the fuel correction factor. You find the value : Actual MPG/ Displayed MPG X 1000 And you will have to enter that in the hidden menu to correct your mpg difference. PS: This is from the top of my head so kindly search it thoroughly before you do it.
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F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play
F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play Last edited by makkan00; 01-03-2015 at 12:55 PM.. |
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01-03-2015, 12:41 PM | #13 | |
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I suppose the main thing is that the consumption is actually okay, but it is annoying that the reading is erratic. I'm afraid I don't know what to suggest
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2009 E92 335d M-Sport 1990 E30 2.8 m52b28 conversion |
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01-03-2015, 12:43 PM | #14 | |
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My Previous Cars
206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 12:44 PM | #15 |
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Might be worth checking the calibration factor on your fuel computer via the hidden menu. It should be 1000 by default and you often need to adjust them by plus/minus 50ish to get the best accuracy. Sometimes dealers deliberately adjust them to give flattering figures to test drivers.
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01-03-2015, 12:45 PM | #16 |
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Thats okay thanks for trying hopefully what Sam has posted above will have some affect
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My Previous Cars
206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 01:04 PM | #17 |
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I may have read it multiple times but never make note of it.
My last two cars were remapped so car mpg was always optimistic. Here is example of it being done on F10 It is very similar to that on E-series. You enter the unlocking code (add last 5 digits of vin) on option 19 in kombi / speedometer. And then I think it is number 20-20.3 in the hidden menu for e-series or something like that to adjust the value. If your last 5 digits are 12345 then your unlocking code will be 15. IF your actual average mpg is 30 and your displayed is 25 then 30/25X1000= 1200 is the value which you should enter. So you add 200 to the value and I think you use 20.03 hidden menu if you have to change it in hundreds. Mr poogle is thinking on right lines. That is how you start and then adjust it after running few tanks. HTH.
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F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play
F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play |
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01-03-2015, 01:08 PM | #18 |
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Just been to have a look, and its all over the damn place, goes from 800-1289 just counts ups on every option of 20 ?
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206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 01:59 PM | #20 |
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I think i have just figured it out, the 1st number that flags up is the current which the 1st time i looked it was 1234 then i clicked and must have changed it so the 2nd time i opened the screen in the video above it started on 1098?
Ive worked out the calculation which is 1234 x 7.3l/km (32mpg) / 10.2l/km (23mpg) = 883 How does that look?
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My Previous Cars
206 1.4, Sport Ka, 206 Gti, focus 1.8, Vectra 1.9 CDTi, Corsa 1.8 Sri, 206 Gti 180, Impreza Blobeye Sti Widetrack, Clio 172 Cup Track Car, E92 335D, Impreza Hatch STI, Evo IX FQ360MR, E92 M3 Competition |
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01-03-2015, 02:38 PM | #21 | |
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20.2 in 10s. 20.3 in 100s. As per your figures, your value should be 1391. I think it allows you to go max to 1250. And I think you are going the other way around and decreasing it.
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F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play
F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play |
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01-03-2015, 03:22 PM | #22 |
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I've set values to 883 and gone for a 44 miles drive at 60-70mph exactly as I did when I purchased the car I managed 46.5 the day I got the car and tonight I've just managed 47.8
So I'm going to keep an eye on it over the next few fill ups and hope I'm not far out and just adjust it as needed. Thanks for all the help and advice |
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