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What's Causing Excessive Fuel Consumption Following Repairs ?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Seeker_UK, Dec 12, 2011.

  1. Seeker_UK
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    Seeker_UK Member

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    [Dec 12, 2011]
    It's just one damn thing after another. :mad:

    Last week, I got the cracked ATF cooler fixed - The rad was replaced, fluids replaced gearbox flushed etc etc.

    I put 4 new tyres on it and then filled up with diesel - to give it a treat I added some Miller's Diesel Ecomax.

    Now it's drinking diesel like it's going out of fashion. Before the repair, I was getting about 100 miles out of the first quarter of the tank, this time I'm getting 70 which equates to about 20mpg. Having just sunk a large amount of money, I'll be damned if I'm going to sink much more into it.

    What should I be looking at this time.

    SIgh.
    Last edited: Dec 12, 2011
    #1
  2. JtotheD
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    JtotheD Events Moderator

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    [Dec 13, 2011]
    Cold weather won't help either...
    #2
  3. Seeker_UK
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    Seeker_UK Member

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    [Dec 13, 2011]
    You're quite right but cold weather won't suddenly clobber my mpg from 28 to 20.
    #3
  4. JtotheD
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    JtotheD Events Moderator

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    [Dec 13, 2011]
    well it won't drop that much from cold weather alone you're right - but on the bright side it's not as big a drop as you think as if the cold equates to like 2-3mpg drop then uve only lost 5mpg from something else... how does the exhaust sound? not blowing at all is it?
    #4
  5. Seeker_UK
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    Seeker_UK Member

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    [Dec 14, 2011]
    No, everything seems OK, starts on the button, quiet (in fact quite muted since I got it back), even idle.

    I think it's buggered and frankly, I just can't be doing with wasting any more money on the damn thing.
    #5
  6. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Dec 14, 2011]
    Is it driving ok?

    Have you had it scanned for fault codes?
    #6
  7. white.akita
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    white.akita Member

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    [Dec 14, 2011]
    Get the codes read, or if you cant be bothered like you said just sell it.
    #7
  8. Seeker_UK
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    Seeker_UK Member

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    [Dec 14, 2011]
    Yes, it seems to be driving very well.

    The problem I have is getting time to get the faults read.
    #8
    quattrodave likes this.
  9. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Dec 14, 2011]
    Any chance they've knocked anything whilst doing it? A fuel line?
    #9
  10. Seeker_UK
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    Seeker_UK Member

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    [Dec 15, 2011]
    Taking your advice, I got the codes read. Nada, apart from an intermittent fault on the needle lift sensor. The mechanic said that it wasn't likely to be a cause of the problem - the biggies like coolant and MAF were OK. Also, no apparent leaks.

    Currently just squeezed 145 miles out of half a tank (normally get 200)

    Curiouser & curiouser.
    #10
  11. adamss24
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    adamss24 Well-Known Member

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    [Dec 15, 2011]
    Needle lift sensor will affect the Mpg and the engine wont run at it's full potential either !
    #11
  12. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Dec 15, 2011]
    Second that, almost certainly thats your problem.
    #12
  13. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Dec 15, 2011]
    Deffo needle lift.
    When mine went the car woudl just stop running. Just die mid drive.
    #13
  14. Seeker_UK
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    Seeker_UK Member

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    [Dec 15, 2011]
    OK but reading some other posts talking needle lift sensor problems and they talk about poor starting and rough idle and loss of power, none of which I seem to be experiencing.

    I better book it in to get it fixed, hopefully before Xmas.
    #14
  15. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Dec 15, 2011]
    They're not cheap, £260 plus seems to ring a bell.
    #15
  16. Seeker_UK
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    [Dec 15, 2011]
    Oh well, I've only spent £2000 on it so far this year - what's another £260?
    #16
  17. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Dec 16, 2011]
    Any chance it's had the loom damaged? As it's a very fine wire on the needle sensor.
    I did put a how2 on here on how to replace it.
    #17
  18. white.akita
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    white.akita Member

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    [Dec 16, 2011]
    how much have you actually spent trying to fix this problem ?
    #18
  19. Seeker_UK
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    Seeker_UK Member

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    [Dec 16, 2011]
    Nothing yet but that's not the point.

    Thank you for your contributions to my thread but I am not spending any more money on it. It's going - it is a nail and I'm cutting my losses before things get even more expensive.
    Last edited: Dec 16, 2011
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  20. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Dec 16, 2011]
    What exactly has been wrong with it? From your first post you've fitted a new transmission oil cooler and a radiator, but surely the fluid changes and tyres are service items and not really the cars fault?

    Sent from my BlackBerry 9900 using Tapatalk
    #20
  21. Seeker_UK
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    Seeker_UK Member

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    [Dec 16, 2011]
    Since I bought it:

    Car - £6000
    New cambelt, pump, thermostat, tensioners - £600
    Service, ATF fluid change - £350
    Respray for front wing after removing front pulled paint off - £150
    Radiator, fluids etc - £650
    4 new tyres - £400
    Various bits and bobs to replace broken trim etc - £30

    Diagnose & repair current problem - £300+ for sure.

    I know cars cost money but of all the cars I have had (and I have had a few, trust me), I have NEVER spent that much in 6 months on one, even the older ones. Even if I discount the wear and tear items, it's still £1400.

    One can argue that for the sake of £300+ it'll all be sorted but I just don't trust it any more.

    Thanks for all your help over the last 6 months but I don't want the worry. Owning a car shouldn't be a worry so I've got something more boring but has a 12 month warranty with it.

    I will be coming back to Audi - the A6 I had before the A4 was fantastic so I'm going to save up for a 2.7 or 3.0 which might be less troublesome.
    #21
  22. scottshere
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    scottshere Member

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    [Dec 17, 2011]
    Isnt all of that wear and tear apart from the front wing repaint?
    The car is 9 years old and guessing has seen a few miles.
    I'd say youve put in the effort to get the main things right (A lot of people dont) and have 1 more hurdle to jump
    But its your call at the end of the day as to where to draw the line
    #22
  23. adamss24
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    adamss24 Well-Known Member

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    [Dec 17, 2011]
    Just thread carefully, just because they are newer does not mean they give less problems. I had a 56 reg a6 3.0 tdi quattro that needed 5 injectors at a cost of 900 quid 2nd hand. You need an older car (1.9 tdi in special) if you want it to be reliable but we all want new/modern cars ! Me personaly , i would not buy any car after 2004- waay to complicated and riddled with electronic problems. On the other hand i do work on my cars and i often buy them as spares or repairs ! So far i bought my allroad for £2300 last year, it needed work, tax and mot. Needed 2 track rod ends, 2 cv joints, front brake pads, rear brake pads and discs, rear caliper(seized), 2 front lower susp. arms (genuine from dealer £300), 2 drop links, 4 new top susp. arms and few more bits and bobs. Few weeks ago it dropped a valve and the engine got damaged- worn cam syndrome ! 700 quid in parts later and it's runing better as new... Who's to blame Me as a mechanic knowing that i have a loud engine and it needs an overhaul or the car because it broke ? It gave me plenty warning signs... Irony of the fate is that i ordered new set of Kolbensmidth cams an lifters a few days before and sold 2 good working engines just days before that ! I do in excess of 40k a year and i use the car primarely for towing- which it does admirably so when it breaks then it gets fixed- simples ! They 're just mere machines really, you can keep them going for a very long time- till rust set's in !!!!
    #23

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