Member Since: 17 Oct 2018
Location: shropshire
Posts: 10
Excessive fuel consumption
I have an 05 Diesel which I struggle to get over 19.5 mpg (on board read out) driving really gently. I can't do a pump to pump check as it also has D3 leaky fuel tank syndrome when full, but it is substantially thirstier than my recently departed D2 TD5.
No signs of excess smoke apart from when I set off I have 0.5 miles downhill followed by an uphill section. As soon as I accelerate up this there are clouds of grey smoke behind for about a mile, but thereafter nothing...
Any thoughts?
4th Feb 2019 2:36 pm
Lrstaylor
Member Since: 04 Oct 2018
Location: Kent
Posts: 589
Yeah that's about right around town
4th Feb 2019 3:35 pm
Narpy
Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830
You need to check all hoses for potential splitting.
Also, ensure you are not suffering brake binding which is very common on these.
Also, consider having the codes read to see what they reveal.
My own 55 manual is doing at least 50% more to the gallon than yours currently. Mods:
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4th Feb 2019 5:28 pm
Iguana
Member Since: 14 Oct 2013
Location: 'Sunny' Zomerset
Posts: 9402
Had brakes binding on a previous D3, took at least 10mpg off! Carefully check for excessive heat around disks if they are binding....I burned my fingers doing this
My current 05 manual mpg is around 29mpg Iggy/Ieuan
Current LR =
2015 RR Sport Autobiography
&
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- Gone but not forgotten:
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MY05 Disco 3 'S'
MY14 FL2 HSE manual in Blue
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4th Feb 2019 6:04 pm
Dazz360
Member Since: 03 Sep 2016
Location: West Mids Walsall
Posts: 871
My manual was getting about 27 mpg stop start traffic and normal running around but this auto is saying about what your getting 19-18 mpg can’t be rightMetal auto sump & fluid change (3 hrs)
LR door puddle projectors (10 mins)
Tinted Bonnet wind deflector (10 mins)
All Intercooler pipes and Tbolts (2hrs)
3 injectors replaced so far (30mins)
Sunroof drain pipes both sides 2.5 hrs)
Rear discs, shoes,pads,callipers,flexi hoses, rigid brake line, n/s upper hub carrier bush and rear n/s upper arm (13hrs over 2 days)
4th Feb 2019 6:16 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4651
Re: Excessive fuel consumption
discoinfernal wrote:
I have an 05 Diesel which I struggle to get over 19.5 mpg (on board read out) driving really gently. I can't do a pump to pump check as it also has D3 leaky fuel tank syndrome when full, but it is substantially thirstier than my recently departed D2 TD5.
No signs of excess smoke apart from when I set off I have 0.5 miles downhill followed by an uphill section. As soon as I accelerate up this there are clouds of grey smoke behind for about a mile, but thereafter nothing...
Any thoughts?
The dash fuel economy indicator is about as useful as a chocolate tea pot. A manual D3 should be doing around 26mpg urban, and 32 on motorway driving. As has been already stated check for brake binding. You say you have plumes of smoke on a gradient, is this with a cold engine?yµ (idµ - eAµ) ψ=mψ
4th Feb 2019 7:09 pm
gareth71
Member Since: 10 Apr 2016
Location: North-east Wales
Posts: 548
19.5mpg on a gently-driven auto diesel suggests that something's not right, I'd say. Especially if that's what the dash computer is telling you, because real figures will be a couple of mpg lower.
I've never had less than 22.5mpg from a tankful since I bought the D3, and that's with almost entirely stopy-starty driving around town. An average tankful with a mix of local and distance driving will be mid 20s - and on a good long run I can count on 32-33. (Those are all actual calculated figures, not the lies that the dash computer tells!)
4th Feb 2019 9:48 pm
discoinfernal
Member Since: 17 Oct 2018
Location: shropshire
Posts: 10
Thanks for all the replies, should have said that it is manual gearbox and most driving is on A and B roads with a little bit of not congested town work. Strangely does not drop significantly when towing....
The smoking is only with a cold engine and doesn't always happen. If it does then it doesn't do it for the rest of the day.
Showing 136k miles with FSH.
Have checked brakes, all ok. Fairly tuned into that due to my ancient Audi regularly suffering seized rear calipers...
4th Feb 2019 11:50 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4651
I drive on similar roads with low traffic levels and get 26mpg.(manual) I never push the engine when cold allowing it to warm up gently. This is more to do with reducing load and wear on the engine and turbo, rather than mpg, though it can't hurt. The smoke you are seeing is unburnt fuel, you could try a little less right foot and see what happens. If you had a split induction hose there would be smoke from the exhaust all the time, so that seems unlikely to be an issue.yµ (idµ - eAµ) ψ=mψ
5th Feb 2019 12:14 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
Doesn't the FSH burn diesel, may be worth looking at.
5th Feb 2019 5:55 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
Hi
May i ask plse , Can a blocked / dirty Map sensor also cause bad mpg
Thks
5th Feb 2019 6:34 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
There is no question that is wrong it helps us all learn.
The MAP (Manifold Absolute Pressure) sensor monitors air density (absolute pressure) in the manifold and sends messages to the ECM to adjust mixture, so yes it could make the engine run "rich" but that is normally accompanied by black smoke.
Taken from a magazine - In modern engines, the engine control module (ECM) measures or calculates air flow via either a mass air flow (MAF) or manifold absolute pressure (MAP) sensor. Turbocharged engines may use both, but naturally-aspirated engines typically use one or the other.
Now the MAF (Mass Air Flow) sensor detects air flow in the intake which also sends messages to the ECM related to how much fuel is required by the injectors.
Hope that helps answer your question.
5th Feb 2019 9:18 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
Hi globetrotter
Bless u for such a helpful reply,
Only had my D3 for nearly 3 x years and every day is a school day
Thks again
5th Feb 2019 10:29 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
You are most welcome, just trying to help in some way
5th Feb 2019 10:33 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
Hi
Huge help and always appreciated
If i may say over the 3 x years of ownership the help has been invaluable to me , saved me a fortune along the way
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