My early MY10 D4 without DPF, 96k miles, has become sluggish performance wise and MPG has dropped big time - lucky to get 300miles to a tank full, previously averaged 375.
Got no warnings or errors on dash. Haven't yet had chance to connect the IID but I'm wondering are EGRs or Turbo potential suspects.
Can the IID test EGR and Turbo live values and if so what do I compare them to?
TIA LRs are a fond memory, apart from the maintenance.
Last edited by MrH on 6th Apr 2016 1:30 pm. Edited 1 time in total
5th Apr 2016 7:08 pm
Soldierboy
Member Since: 27 Jan 2016
Location: Sheffield
Posts: 728
Sounds daft but have you tried changing your air filter and also do you use additives in the fuel? I usually pud diesex in the fuel every month depending on the milage I do and turbo flush every six month and that has helped me with my mpg just a thoughtGod created heavy armour on 06 sept 1916, on the 7th the devil stood to attention!
Fuji white D4 MY11 GS 3.0 SDV6 MODS:
SMD LEDS INSIDE, SIDE LIGHTS, REAR FOG AND REVERSE
OEM SIDE STEPS
STAINLESS STEEL SCUFF PLATES
RUBBER MATS
SHORT ROOF BARS
RETROFITTED CC
BLACK HUBS & DUST CAPS
GLOSS BLACK GRILLE, SIDE VENTS AND WHEELS
BLACK BADGES FRONT REAR AND STEERING WHEEL
MUD GUARDS FRONT AND REAR
GLOSS BLACK DOOR HANDLES AND LETTERING
Yup, change the year filter every 6k and use Millers Eco Diesel every 3rd or 4th fill. LRs are a fond memory, apart from the maintenance.
5th Apr 2016 7:16 pm
Soldierboy
Member Since: 27 Jan 2016
Location: Sheffield
Posts: 728
Possibly maff sensor or an air flow sensor sum where? Best get it plugged in to double check wen u get a min lets us know how you get on! God created heavy armour on 06 sept 1916, on the 7th the devil stood to attention!
Fuji white D4 MY11 GS 3.0 SDV6 MODS:
SMD LEDS INSIDE, SIDE LIGHTS, REAR FOG AND REVERSE
OEM SIDE STEPS
STAINLESS STEEL SCUFF PLATES
RUBBER MATS
SHORT ROOF BARS
RETROFITTED CC
BLACK HUBS & DUST CAPS
GLOSS BLACK GRILLE, SIDE VENTS AND WHEELS
BLACK BADGES FRONT REAR AND STEERING WHEEL
MUD GUARDS FRONT AND REAR
GLOSS BLACK DOOR HANDLES AND LETTERING
5th Apr 2016 7:22 pm
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26767
Will get IID plugged in tomoz. LRs are a fond memory, apart from the maintenance.
5th Apr 2016 8:01 pm
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
too much EGR mash (but strange on a D4, was a issue on 2.7 lion)? mileage?Discovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
IID plugged in and taken for a test drive this morning. Looks like the EGRs are sticking open a little, both consistently reporting 3-4% more open than being commanded to - so still open when they should be shut tight.LRs are a fond memory, apart from the maintenance.
6th Apr 2016 10:34 am
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
Would be interesting to compare those values to those on a 'known good' vehicle. Mine has always reported 3-4% open when commanded 0. I don't have any of the other symptoms you describe.
6th Apr 2016 6:48 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73048
What are the values cf the other D4 on the drive.
Or does MrsH not let you near hers with the IID. Wise that she is.
Ok finally got round to a test drive in SWMBOs MY16 with the IID connected and that too has a 4% discrepancy between commanded and actual - so that suggests they are working properly in my MY10. back to square one LRs are a fond memory, apart from the maintenance.
9th Apr 2016 9:28 pm
discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
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back to square one 
