Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804
Flat spot below 1800rpm
My Sdv6 has an annoying flat spot below 1800rpm. Above that it pulls like a train. No smoke, no warning lights but when it drops below 1800 its just flat as a pancake(usually at junctions or slow corners). The trouble is i then give it a bit more throttle and it kicks down and takes of like a rocket
Member Since: 17 Jul 2013
Location: North Yorkshire
Posts: 141
think there a gearbox software update that cures it
1st Feb 2018 10:05 pm
marsie
Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804
Don't think its gearbox related because i can manually select 1st and its still the same Previous Discos
1989 200tdi 3dr
1994 300tdi ES
1995 3.9 ES (x3)
2000 4.0 adventurer
2001 4.0 ES
2005 D3 HSE (zambesi silver)
2007 D3 SE (Lugano teal)
2011 D4 XS (Baltic Blue)
2008 D3 HSE PREMIUM (buckingham blue)
2009 D4 XS (Nara bronze)
2006 D3 Metropolis (Java Black)
2012my D4 HSE (indus silver)
Current 2013 D4 XS (Firenze red)
1st Feb 2018 10:09 pm
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
sounds like the old fashioned hesitation issue
1st Feb 2018 10:12 pm
Simonstarski
Member Since: 24 Jun 2012
Location: Cornwall
Posts: 686
EGR valve stuck?Narpy Grill, tinted windows, Smooth leather wheel (TLO Group buy), ACM fitted (thanks TLO), Rear door loom and Row 2 & 3 audio switch upgrade, RRS 20" wheel change, 285 Cooper LTZ's Sat Nav Mod (until I get a Faultmate upgrade), Front & Rear lamp guards. 4x4 screen now switched on - Woody32, Follow me home reverse lights - woody32, Auto release EPB - Woody32. Off Road Navigation - Woody32. Remap + EGR's switched off. Full chassis clean and Waxoyl.
1st Feb 2018 10:19 pm
marsie
Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804
I did wonder about the egr as i had similar symptoms on a d3 years ago but that was much worse and hardly accelerated at all below about 2500rpm. This is nowhere near as bad but still a pronounced delay below 1800
Was hoping the EGR valves were good on the d4 Previous Discos
1989 200tdi 3dr
1994 300tdi ES
1995 3.9 ES (x3)
2000 4.0 adventurer
2001 4.0 ES
2005 D3 HSE (zambesi silver)
2007 D3 SE (Lugano teal)
2011 D4 XS (Baltic Blue)
2008 D3 HSE PREMIUM (buckingham blue)
2009 D4 XS (Nara bronze)
2006 D3 Metropolis (Java Black)
2012my D4 HSE (indus silver)
Current 2013 D4 XS (Firenze red)
1st Feb 2018 10:39 pm
marsie
Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804
Going to have a go in my mates 2013 D4 and compare it with mine, have been told all 8 speed SDV6s hesitate but my last 09 D4 didn'tPrevious Discos
1989 200tdi 3dr
1994 300tdi ES
1995 3.9 ES (x3)
2000 4.0 adventurer
2001 4.0 ES
2005 D3 HSE (zambesi silver)
2007 D3 SE (Lugano teal)
2011 D4 XS (Baltic Blue)
2008 D3 HSE PREMIUM (buckingham blue)
2009 D4 XS (Nara bronze)
2006 D3 Metropolis (Java Black)
2012my D4 HSE (indus silver)
Current 2013 D4 XS (Firenze red)
1st Feb 2018 10:40 pm
marsie
Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804
Member Since: 02 Nov 2017
Location: Hertfordshire
Posts: 187
What did you do to cure it? I sometimes think my D4 hesitates under similar circumstances to yours.
4th Feb 2018 9:13 pm
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
marsie wrote:
hopefully cured it
Yes explain to usDiscovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition IID Pro MV License
5th Feb 2018 12:04 am
npikey
Member Since: 10 Feb 2013
Location: Louth lincolnshire
Posts: 101
Yes, what did you do, as ive had a hesitation from new ;-(
5th Feb 2018 10:40 am
marsie
Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804
Changed a MAF sensor and stripped and cleaned the TCO valve. Also found a split vac hose under the engine cover. Much better than before but getting a Low boost pressure fault flagging up (no fault light) so going to check if actuators are sticking Previous Discos
1989 200tdi 3dr
1994 300tdi ES
1995 3.9 ES (x3)
2000 4.0 adventurer
2001 4.0 ES
2005 D3 HSE (zambesi silver)
2007 D3 SE (Lugano teal)
2011 D4 XS (Baltic Blue)
2008 D3 HSE PREMIUM (buckingham blue)
2009 D4 XS (Nara bronze)
2006 D3 Metropolis (Java Black)
2012my D4 HSE (indus silver)
Current 2013 D4 XS (Firenze red)
5th Feb 2018 7:15 pm
shepheam
Member Since: 18 Feb 2016
Location: Milton Keynes
Posts: 45
marsie, How did you manage to diagnose a MAF sensor, TCO valve (by the way what is a TCO valve ) and find the split hose without there being any faults?
I'm intrigued as I have a similar issue but occasionally it disappears so I know it is intermittent. It's driving me nuts as I know it can be fine, but most of the time I have this 'hesitation'. Whenever it is at a garage I'm told there is nothing wrong and they 'are all like that'.
Happy to have a look myself but a few pointers would be much appreciated.
8th Feb 2018 10:23 am
marsie
Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804
Vac hose found purely by accident. TCO (TURBO CHANGE OVER VALVE) valve is a common fault on D4s so did that as a precaution and MAF sensor was swapped from a good car and improved the hesitation. It is still there (more than my older TDV6 D4) but is much improved. Next job is to check the turbo actuator movement but it seems the hesitation cannot be fully cured on a SDV6 Previous Discos
1989 200tdi 3dr
1994 300tdi ES
1995 3.9 ES (x3)
2000 4.0 adventurer
2001 4.0 ES
2005 D3 HSE (zambesi silver)
2007 D3 SE (Lugano teal)
2011 D4 XS (Baltic Blue)
2008 D3 HSE PREMIUM (buckingham blue)
2009 D4 XS (Nara bronze)
2006 D3 Metropolis (Java Black)
2012my D4 HSE (indus silver)
Current 2013 D4 XS (Firenze red)
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
) and find the split hose without there being any faults?
