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Jetlag
Member Since: 10 Mar 2012
Location: Johannesburg
Posts: 205
  
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| Losing power on a long uphill... |
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Gents,
Quick question, when I am out and about cruising our South African 'freeways' I find that my 2012 SDV6 loses power on a long steady uphill when in cruise control...
I can see the revs and speed drop to about 80km/h from 120km/h without the auto box gearing down. When I put my foot down to override the cruise control the auto drops a gear and from there starts gaining speed in cruise control.
I have had a dual flush about 5000km ago with a dose of Dr Tranny but that didnt fix it.
Any ideas what this could be? blocked/ dirty Fuel filter? or is this perhaps another symptom of my mud in radiator issue Disco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
Follow my adventures on Instagram @XpeditionAfrica
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 11th Oct 2018 4:24 pm |
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al cope
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10355
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something isnt right, a 40kph drop. In the UK on hills mine drops 2mph when on cruise before the cruise control picks the speed back up to whatever it was set at, changing down if it need to.
Al Volvo XC90 B5 Plus Dark
Gone - MY18 D5 HSE - Corris on 22's with Black Pack
Now gone - MY16 D4 SE Tech, Loire Blue, Almond Leather, Privacy, plus some other goodies.
Old - MY12 D4 SDV6 XS Auto - Ipanema Sand with Almond Leather - Plus other niceties, and D4.com sticker
Older - D3 TDV6 XS Auto - Lugano Teal with Almond Leather, 20" Stormers, Shiny Tailpipes, DVD/TV - and obligatory D3 sticker
Ancient - D3 TDV6 S - Tonga with Ebony, 20" Stormers, satnav & DVD
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| 11th Oct 2018 4:42 pm |
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Jetlag
Member Since: 10 Mar 2012
Location: Johannesburg
Posts: 205
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Thats what I thought and how I remember it to be.... hence my asking on here....
sigh Disco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
Follow my adventures on Instagram @XpeditionAfrica
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| 11th Oct 2018 4:44 pm |
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oyvindr2
Member Since: 20 Oct 2018
Location: Norway
Posts: 3
 
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Did you find out what was wrong with youre cruise control? I got the same problem.
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| 11th Sep 2019 7:45 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8235
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How long has it done this? -has it always been like it or has it just started.
If it has just started try a hard reset, this will remove any corruption in all the modules caused by static electricity.
If it has always done it there is a setting in the CCF for the % speed drop before changing down which may or may not help, Make a note of existing settings before any changes.
I had this problem with my D3, when it did change down it took off like a scalded cat to reach the speed setting, an update of the gearbox software from GAP completely cured it, I’ve never had it happen with the D4.
I don’t think you are losing power, just speed, if you are losing power it would change down sooner rather than later.
Do you have DPF? - it could be in the cleaning cycle, this usually happens on long drives and can reduce power. It can when others can't,
It will when others won't,
It goes where others don't.
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| 11th Sep 2019 9:25 pm |
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oyvindr2
Member Since: 20 Oct 2018
Location: Norway
Posts: 3
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It was fine this summer when I was on holiday. How do I do the hard reset?
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| 13th Sep 2019 10:27 am |
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James W
Member Since: 27 Mar 2008
Location: Riyadh, KSA
Posts: 3079
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https://www.disco4.com/wiki/Hard_Reset D4 XS, gone, much loved, never forgotten
2018 FFRR SDV8 Autobiography - Gone to someone with less sense and more time to enjoy it 
2016 Toyota Hilux Invincible - Liberating experience
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| 13th Sep 2019 10:34 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8235
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oyvindr2 wrote:It was fine this summer when I was on holiday. How do I do the hard reset?
Don’t be to over zealous with the Dr Tranny, although it works wonders with slipping clutches by making the oil seals swell it also makes all the oil seals swell, don’t use it unless there s no other economical solution, it is usually only a temporary solution to buy more time to cure the real problem. It can when others can't,
It will when others won't,
It goes where others don't.
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| 13th Sep 2019 9:02 pm |
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