Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
Mines a manual D3, I drive 5 miles each way to work and back, plus the occasional longer drive. My journey to work is B roads, never faster than 40, but generally get 27/28 MPG (calculated) showing 31 ish on the dash.Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
5th Feb 2019 10:50 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13610
Still think it’s impressive the Mpg u can get out of these discos considering the weight of them
Mines an auto, around town / get an average of 19/21 mpg, motorway around 29/ 31Mpg , very happy with that
I reckon my lie ometer is around 10% over
5th Feb 2019 11:09 am
Dazz360
Member Since: 03 Sep 2016
Location: West Mids Walsall
Posts: 871
G Stuart mine is an auto and your saying it’s right with what yours is gettingMetal 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)
5th Feb 2019 11:43 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13610
Hi
I tanked it a good few times to get the figures after I learnt from others not to trust the lie ometer
May i ask , Have u done a comparison between tanking it and the mpg monitor to see how far it’s out
5th Feb 2019 12:06 pm
discoinfernal
Member Since: 17 Oct 2018
Location: shropshire
Posts: 10
PROFSR G, totally agree with allowing everything to warm up gently, any less throttle and I wouldn't get up the hill!
I am wondering if coolant temperature has an effect on fuel mixture in diesels? It does seem mine is over fuelling, it's just finding out what is telling it to over fuel.
I have access to a Lynx diagnostic unit but no experience of using it.
I have plugged it into my universal scanner and no codes are showing.
I would be absolutely delighted with 26 mpg!!!
5th Feb 2019 1:46 pm
Dazz360
Member Since: 03 Sep 2016
Location: West Mids Walsall
Posts: 871
Haven’t tried tanking as not had this auto long, just going off my car before being a manual and lie ometer telling me 28 mpg normal driving. I’ve got the chance to swop my injectors from my manual d3 (I’ve has them checked and passed) to this d3 auto, this thinking aloud could my injectors be causing poor fuel consumption as I don’t know the history of these injectors on my autoMetal 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)
5th Feb 2019 3:00 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13610
Hi
Will be interesting to see what the actual figures after tanking
The other more experienced members here will be able to confirm but wonder if there’s any difference between auto and manual injectors , or if they have to be programmed ????
If u buy an iid ur be able to see what the injectors are doing , as an example these were my readings
8th Feb 2019 12:31 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4627
discoinfernal wrote:
PROFSR G, totally agree with allowing everything to warm up gently, any less throttle and I wouldn't get up the hill!
I am wondering if coolant temperature has an effect on fuel mixture in diesels? It does seem mine is over fuelling, it's just finding out what is telling it to over fuel.
I have access to a Lynx diagnostic unit but no experience of using it.
I have plugged it into my universal scanner and no codes are showing.
I would be absolutely delighted with 26 mpg!!!
Tbh you need dedicated LR diagnostics if you want to get the truth out of the modules. (GAP IID)
There are members on here in your area who will be able to help if you do a search. Temperature does plays a role in the fuel delivery process on modern Diesels. If you genuine believe you are overfuelling then get it checked properly, it doesn't take much for these engines to "throw a spanner in the works"
Literally! yµ (idµ - eAµ) ψ=mψ
8th Feb 2019 5:20 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13610
Hi prof g
May i ask a Daft question plse, seeing I’m so good at them
Is it ever req to do an injector leak back test on these engines , or is it a pointless exercise because the Gap iid basically tells u the same of what a leak back test would
Many thks as always
8th Feb 2019 5:38 pm
blue meanie D3 Decade
Member Since: 04 Aug 2005
Location: Newbury
Posts: 6861
Just for balance my 55 manual with mostly short trips averages around 21 and on long runs if I 'drive carefully' it will reach the dizzy heights of 28mpg overall if I am really lucky (calculated)
- this hasn't changed much over the 13+ years and 140K miles that I have owned it from new and theeeeennn......???
8th Feb 2019 5:46 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4627
gstuart wrote:
Hi prof g
May i ask a Daft question plse, seeing I’m so good at them
Is it ever req to do an injector leak back test on these engines , or is it a pointless exercise because the Gap iid basically tells u the same of what a leak back test would
Many thks as always
Hey gary, how you doing maty? Nothing daft about your question or any other for that matter.
Leak off tests are essentially a very basic diagnostic test, but they can quickly tell you how much each injector is consuming.
They can be a bit fiddly/clumsey in use, and messy sometimes.
For me, they are however largely redundant in the presence of modern diagnostics. That said, I like to keep them around, as sometimes the modern tech won't co-operate and you just have to go back to basics yµ (idµ - eAµ) ψ=mψ
9th Feb 2019 4:03 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13610
Hiya
Bearing up under the strain
Many Thks , it did make me wonder if the iid was basically the more modern test
Ur not wrong there with basics, done it on my older TD4 and by Christ was it messy , even worse when they get tipped over, plse don’t ask how I know
Imagine it would be right nightmare trying to do it on the TDV6
Thks so much as always
9th Feb 2019 4:10 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4627
Well its not all that difficult on the TDV6, but you're right good diagnostics should tell you what you need to know. Anyway, isn't it past your bedtime? It is mine yµ (idµ - eAµ) ψ=mψ
9th Feb 2019 4:18 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13610
Many thks for the reply ,
Bedtime , what’s that
9th Feb 2019 4:34 am
discoinfernal
Member Since: 17 Oct 2018
Location: shropshire
Posts: 10
Tbh you need dedicated LR diagnostics if you want to get the truth out of the modules. (GAP IID)
There are members on here in your area who will be able to help if you do a search. Temperature does plays a role in the fuel delivery process on modern Diesels. If you genuine believe you are overfuelling then get it checked properly, it doesn't take much for these engines to "throw a spanner in the works"
Literally! [/quote]
Thanks for the advice Prof, just hooked up the Lynx and obtained the following data with it running on tickover.
Injectors:1- 934, 2-1108, 3-1211, 4-1063, 5-1187, 6-616
MAP sensor 93.25 Kpa
MAF sensor A signal frequency 19g/s
Supplementary engine coolant -40degC
Obviously number 6 looks a bit odd - any idea what this could be?
Do the rest seem in the right ball park?
Before I started I cleaned the MAP sensor which was completely crudded up.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
