Sky InsuranceChris Nott
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  1. #1
    6th Gear

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    MPG gone aweful suddenly.

    The mpg on my 2.5 tdi has suddenly gone aweful. I used to constantly see 38mpg, 35 if i was a naughty boy occasionally.
    Recently, when filling up and working it out. It's always on 31mpg.
    MAF? Temp sensor?

    Any tests using vcds worth doing?
    Atlas Grey A4 2.5 TDI Quattro Sport.
    Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
    To do: None yet.
    Next: Auto dip rearview mirror and Folding Mirrors.

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  3. #2
    quattrojames's Avatar
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    I take it you've scanned it and no fault codes?
    Ingolstance Read about my A6 HERE.

  4. #3
    6th Gear

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    I've done a scan on the engine, only fault is an engine code James.
    I did notice theres a 4 degrees temp difference between engine and instrument temps. Does that sound normal?
    Atlas Grey A4 2.5 TDI Quattro Sport.
    Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
    To do: None yet.
    Next: Auto dip rearview mirror and Folding Mirrors.

  5. #4
    Avant4me's Avatar
    The're Graphite not black!!

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    4 degrees is about right, the gauge is never going to be accurate.

    Official Fan Club member No 001!!

  6. #5
    audigeezA4's Avatar
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    i have already accepted that the mpg on mine is never gonna be much more than what i am getting now, with a mixture of motorway and town driving i get 30.91mpg working it out manually, however, the dis states 24.8mpg on the 2 setting- so clearly my dis is completely inaccurate, i have even calmed down with my driving style but alas no effect.

  7. #6
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    Really odd, as when I took it to FortWilliam, I got 45mpg. That's worked out at the pumps too.
    Atlas Grey A4 2.5 TDI Quattro Sport.
    Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
    To do: None yet.
    Next: Auto dip rearview mirror and Folding Mirrors.

  8. #7
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    Hi,

    Have you checked for boost leaks.

    Is yours a auto or manual?
    2004 A4 2.5tdi Avant quattro Sport Tip, BOSE, Elec Heated Leather Seats with Memory, Sunroof, Black Optic Pack (Black Grill, Window Frame and Roof Rails), Front & Rear Electric Windows, Front & Rear Parking Sensors, Lighting Pack, Xenon Lights with Washers, Come Home Lights, Electric Retracting Mirrors, Auto Dimming Rear View & Side Mirrors, Under Seat Storage & 6 CD Changer

    Gone But Not Missed -

    2003 A4 Saloon 1.9tdi Sport Multi, Leather/Alcantara Heated Seats, Lighting Pack & RS4 Alloys

  9. #8
    audigeezA4's Avatar
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    Quote Originally Posted by BlackQuat View Post
    Really odd, as when I took it to FortWilliam, I got 45mpg. That's worked out at the pumps too.
    Blimey, 45 would be nice. I thought 30-35 was the norm anyway? I have only got 64k on the clock with fdsh, 53 plate,Manual so i thought i would get betta mpg than say a higher mileage. I recall someone saying cleaning the injectors, replacing air/fuel filters would help which i will get roubd to doing mine- one day.

  10. #9
    6th Gear

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    Mines a manual.
    When I said the difference in temps. I meant on vcds. Logging into instruments and engine. The engine temps are different.
    Atlas Grey A4 2.5 TDI Quattro Sport.
    Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
    To do: None yet.
    Next: Auto dip rearview mirror and Folding Mirrors.

  11. #10
    silversurfer's Avatar
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    Mine mates Diesel BMW had a similar issue, and he's just had to get a new turbo as the oil pipe was blocked

    This also didn't show up on the diagnostics before hand.

  12. #11
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    try some redex or similar. dirty injectors are not good for diesels mpg. easy to do and could sovle the issue.

 

 

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