I have what appears at this point to be a unique problem:

I bought my TDV8 new in June 2008, and for the first 5,000km was averaging around 12lt/100km. All my calculations are done using actual literage and mileage, not the trip computer, which is consistently 2lt/100km on the hopeful side.
At 5,000km I installed a chip (Evolve's remap), and the car returned around 11Lt/100Km for the following 10,000km, as well as having much better response. Happy bunny so far........
At 15,000km I had the first service done, and since then (about 6,000km), I have been averaging between 16Lt/100km and 18Lt/100km. I made a conscious effort to drive one tank through like a 90yo woman last week, and still managed only 500km from 74Lt (14.8Lt/100km). It is driving me up the bloody wall.
Performance seems to be the same, and I haven't noticed any differences in noise or smoke output. There is also not a hole in the fuel tank (perhaps a silly idea, but I have checked anyway). So far my dealer has not been able to come up with a suggestion.
The only other point that should probably be noted is that I started mixing 1/200 semi-synthetic 2-stroke oil into each tank at about 13,000km, and am continuing to do so. I have noticed improvements in engine noise, but due to the economy issue, couldn't tell you whether the oil is having a beneficial effect on fuel consumption.
I would appreciate any constructive suggestions as to what the issue may be, or to hear from anyone who has experienced anything close to this level of consumption from their TDV8. I do not baby my car, but I also do not drive it any different now from the way I drove it in the beginning.
Thanks in advance

Mattserati Java Black TDV8
Ebony
Sunroof
TPI
20" Rims
Tint

Assuming there are no fault codes:

Check that your EPB isn't binding - go for a drive and then check if the wheel with the EPB gets hotter than the others. If anything, the 2-stroke oil should improve consumption, not make it worse.

If the EPB is ok, maybe get your dealer to reflash the ECU?

Bet they messed something up at the last service.

Last edited by Leo on Sat Apr 04 2009 9:27pm. Edited 1 time in total

Mattserati wrote:

The only other point that should probably be noted is that I started mixing 1/200 semi-synthetic 2-stroke oil into each tank at about 13,000km, and am continuing to do so.

full thread on 2stroke been added
http://www.freel2.com/forum/topic878.html?highlight

Has the dealer reflashed the ecu by any chance.....a friend of mine had a TDV6 remapped and the dealer did reflash the ecu BUT and it's a big BUT....they did not reflash the whole of the engine maps so the car still appeared to be remapped but whatever changes LR had made was enough to ruin the fuel economy even though performance was about the same!!

If the ECU has been reflashed by the dealer then it is extremely likely that your remap has been removed. Try reinstalling your chip remap. TDV6 - gone
TDV8 - gone
Audi Q5 3.0 Tdi Sline wef 6/11/10

17L/100km = 16mpg!!!

Definitely something wrong there, chipped or not.

Josh wrote:

If the ECU has been reflashed by the dealer then it is extremely likely that your remap has been removed. Try reinstalling your chip remap.

Update:

I have now done just a bit over 36,000km, and have therefore just had a service carried out. Prior to this I had still been averaging 16 - 17 L/100Km based on actual fuel in Vs Kms travelled. The trip computer was showing a hopeful 14.6 L/100Km. I made sure that the service guys reset every computer, as well as checking for any other faults or issues they could see as possible causes. They reported none.

Well after having just completed one tank full the trip computer is showing 17 L/100Km, and my actual usage is just under 19 L/100Km. And here was me thinking it couldn't get worse.

I have now fired off a letter to Land Rover asking for their technical people to have a look at my vehicle. I would really appreciate it if anyone could let me know if they have a similar story and/or solution. I really like the car, but it really is getting beyond a joke when I return less distance on a tank than a well driven supercharged. Java Black TDV8
Ebony
Sunroof
TPI
20" Rims
Tint

Did you ever get the remap re-installed?

If you know another dealer, or someone with autologic etc, get them to check that your sealer really did reset everything all the ECUs and you have all the latest software.

Leo - This time around I rang Evolve, who were quite happy for me to resend the base program once the car came back from service after a reboot, reprogram again (at no cost) and send it back - all just to make sure that it wasn't an issue with the remap. The guys there have been nothing but helpful and efficient, for which I am very grateful.
In my experience the remap has only ever made the economy better, by about 1 L/100Km, and having tested both stock and remap recently this is still about right.
I know my dealer personally and am 100% sure they have done as they have said. They are as much at a loss as me - it would appear that I just have a problem which has not been seen before (the worst kind of problem to have). I have taken every logical step I can think of to identify the cause of the issue, but all to no avail. My final avenues are either to find someone who has experienced/solved the same issue, or for LR Technical to solve it.Here's hoping. Java Black TDV8
Ebony
Sunroof
TPI
20" Rims
Tint

No its not the first time Mattserati - and it wont be the last. You need to get the input sensors checked against a good example to determine it. The ECU will only log a fault code on some sensors if they are open or closed circuit - but not when they are out of range slightly. It is normally the Air Mass Meter - the device that tells the ECU the amount of air entering the engine - so that it can determine how much fuel to deliver. You need the technician to check the air flow meter signal voltages with the laptop (or a very accurate digital volt meter or better still a hot live scope on the passenger seat) while driving the car at different engine loads. If it is out of spec it is a throw away item that can not be calibrated - unless you have a poor breather system and it is oil mist film contamination - in which case you can clean the oil off their internals with carb/brake cleaner. As for the maps - they will not make any difference to your problem whether it is standard, re-mapped or not - LR changed the maps slightly in Feb 09 to up 10% power on all engines for better driveability - these are the best economy ones - of which you should have off the latest dealer flash file up-dates. If you do have to change any sensors that are suspect - it is a good idea that they reset the self learn adaptions - these are the self learn peramaters within the engine ECU that learn the drivers habits and react to suit to give you the best operating window within the available power/economy. If you don't reset them it will still self learn the adaptions - but it takes longer. I had the problem on my V8 Diesel RRS - 18-19MPG on 300 miles at 60-70MPH.

Good Luck You don't stop playing because you get old, You get old because you stop playing.

07 TDV6 been and gone. 08 TDV6 been and gone. 08.5 TDV8 in evaluation mode and now gone. BMW 535D M sport Been and gone, Now time for RRS No4 - TDV6 HSE in Stornaway with Ebony - 09 Model 6 months old.
RS Cosworth 4x4 Stage 2 Mint for summer
Audi TT
Astra VXR for the daughter.

Nutty Nige wrote:

LR changed the maps slightly in Feb 09 to up 10% power on all engines for better driveability - these are the best economy ones - of which you should have off the latest dealer flash file up-dates.

Correct --- well spotted Tim - and happy new year. You don't stop playing because you get old, You get old because you stop playing.

07 TDV6 been and gone. 08 TDV6 been and gone. 08.5 TDV8 in evaluation mode and now gone. BMW 535D M sport Been and gone, Now time for RRS No4 - TDV6 HSE in Stornaway with Ebony - 09 Model 6 months old.
RS Cosworth 4x4 Stage 2 Mint for summer
Audi TT
Astra VXR for the daughter.

Tim in Scotland wrote:

Nutty Nige wrote:

LR changed the maps slightly in Feb 09 to up 10% power on all engines for better driveability - these are the best economy ones - of which you should have off the latest dealer flash file up-dates.

Wonder if this LR remap accounts for why my car has been averaging 30+ mpg for the 3 weeks since it was serviced then? Was getting between 26 and 29 in local driving but now I am over the moon that my consumption of tractor juice has dropped especially with the price of fuel leaping up tonight! Since the service I have been averaging between 30 and 34mpg out of my TDv8