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What can cause poor mpg ??

Discussion in 'A3/S3 Forum (8L Chassis)' started by motfree, Nov 28, 2010.

  1. motfree

    motfree Member

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    Just wondering what is causing my car to use soooo much fuel even when I'm driving sensible ..
     
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  3. Wozski

    Wozski Member

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    Alot of factors can make it worse - especially this time of year as its bloody freezing lol - also having a heavy foot, but if your driving sensibly im not sure what else to say....
     
  4. AudiS3-Turbo

    AudiS3-Turbo Member

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    seems poor mpg threads is popular this time of year lol
     
  5. LiveWire

    LiveWire S3X

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    Wide tyres :cold:
     
  6. motfree

    motfree Member

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    Coolant temp ??
     
  7. CHRIS555

    CHRIS555 DOPE with added OCD

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  8. S3KO4

    S3KO4 Member

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    WEIGHT
    WIDER TYRES
    DECAT
    FAULTY SENSORS, MAF, COOLANTS, COIL PACKS..
    FAULTY, THERMOSTAT
    OVERDUE SERVICE
    AIR-CON

    HEAVEY FOOT
    SHORT TRIPS
    BOOSTING and HIGH RPM
     
  9. motfree

    motfree Member

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    Brand new Maf on 2 weeks ago ..
    Maybe but it's using around £10 for 30 miles and that's not putting my foot down .. Think I'll go to a garage :) as I don't have a clue
     
  10. S3KO4

    S3KO4 Member

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    I get the same, regardless of how carefull I am.

    Just to add to the list. feel free to add your thoughts

    WEIGHT
    WIDER TYRES
    DECAT
    WORN CLUTCH causing slips. not power no go.
    FAULTY SENSORS, MAF, COOLANTS, COIL PACKS..
    FAULTY, THERMOSTAT
    OVERDUE SERVICE
    AIR-CON
    SEIZING BRAKES.
    WORN OUT BEARINGS


    HEAVEY FOOT
    SHORT TRIPS
    BOOSTING and HIGH RPM

     
  11. motfree

    motfree Member

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    Actually my coolant sign keeps coming up on my dash ? Maybe that sensor is bust .. But why would this make it use more fuel :-S ??
     
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  12. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp?

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    Blowing exhaust before the O2 sensor leaking more air in with the ECU thinking the engine needs more fuel

    Boost leak and vacuum leak is also the same
     
  13. djarchive

    djarchive Member

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    Im getting this only on very cold morning starts though. Anybody know what this is caused by?


    Strange :S
     
  14. Imteyaz

    Imteyaz 6th Gear

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    It may be fuelling high as the coolant sensor is telling the ECU that the engine is 'cold' and as a result it is pumping a richer mixture through. I would try changing the sensor first, whilst you are at it, check your tyre pressures and also check the state of the airfilter (infact, check when it was last serviced and when it is next due for servicing).

    EDIT: Coolant sign on the dash also comes up when the expansion tank sender decides that it wants to play up - a new one is about a tenner and should sort it out, oh and its nice and white, and not a light brown colour as they tend to discolour over time so it's easier to make a visual check of how much coolant you have in there.
     
    #13 Imteyaz, Nov 29, 2010
    Last edited: Nov 29, 2010
  15. s3dave

    s3dave TFSI Hybrid
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    I got this this morning, just scraping snow of the windscreen and the dreaded 3 beeps showing coolant low, went off within 5 seconds....
     
  16. Hector8

    Hector8 Member

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    Try the simple things first like wheel allignments and tyre pressures all correct.
     
  17. Silverfish

    Silverfish New Member

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    Tracking to cure poor fuel consumption Classic fella ,also check parcel shelf straps ,could be that too
     
  18. Broken Byzan

    Broken Byzan Photographic Moderator
    Staff Member Moderator VCDS Map User Audi A4 quattro

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    Mr fish, Hector is correct, wheel alignment can cause tyre scrubbing which needs to be overcome by engine power, using more fuel
     
  19. Silverfish

    Silverfish New Member

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    If you say so ,go get tracking done then and see you in a week when you still have the same problem.
     
  20. bengal

    bengal Member

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    Tracking can cause higher fuel consumption but i think it would have to be way out though as said by bryzan the engine will be working harder to overcome the resistance caused by this its the same principle as binding brakes and low tire pressures.
     
  21. Silverfish

    Silverfish New Member

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    Go get it plugged in ffs
     
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  23. s3dave

    s3dave TFSI Hybrid
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    lol
     
  24. Broken Byzan

    Broken Byzan Photographic Moderator
    Staff Member Moderator VCDS Map User Audi A4 quattro

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    I do say so as it's fact.....

    It is however unlikey that its changed that much without the driver noticing, but it can be a contributing factor if all else has been checked
     
    #22 Broken Byzan, Dec 3, 2010
    Last edited: Dec 3, 2010

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