nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1359
  
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Just had a great drive up to Carlisle to collect my parents and some friends who walked much of Hadrian's Wall. I had a steady run up yesterday and when I got there, the lie-ometer indicated an average of 41.6 mpg (170 ish miles).
Coming back today with the awful weather (heavy rain and strong winds), busy traffic and a loaded car, when I got home it indicated 37.9 mpg. Filling it up revealed an actual 34.4 which still ain't bad I don't think.
Now to the possible point. On the A1 just south of Wetherby I pulled into the centre lane and put my foot down. The car changed down what appeared to be two gears, and immediately it felt like I was running over a cattle grid for a second or so. I'm not sure whether I lifted off or not, but at the same time as the "cattle grid effect" there seemed to be no increase in power. There were no warnings or "bongs", and from then on the car drove perfectly again.
After dropping my parents off in Chesterfield, I gave the car a bit of stick (for me anyway), and it was perfect, kicking down as it should and going like stink (hence the increase in fuel consumption!). Does anyone know if there's a short section of the A1 there that causes the effect, or do I have a possible issue with the car?
Signed, PARANOID!
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 22nd Jun 2012 6:35 pm |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73086
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Bit of clutch (or equiv in the autobox) slip?
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| 22nd Jun 2012 6:45 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1359
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DSL wrote:Bit of clutch (or equiv in the autobox) slip?
Would that not throw up a warning?
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| 22nd Jun 2012 7:24 pm |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73086
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No idea, never had it in my D3 but had it once in another car with an 8 speed ZF box when headed out of my side street just by planting my foot down (at 4am so brain not engaged). It stopped after I backed off the loud peddle.
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| 22nd Jun 2012 7:38 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1359
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Was there a fault or was it a one-off? I take it that it was on your 520?
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| 22nd Jun 2012 7:40 pm |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73086
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Yep in the 520d, same(ish) 8 speeder as in the D4. Just a one off, never done it again despite trying to replicate. I don't think it was wheel spin with TC moderating it but it could have been s'pose. 
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| 22nd Jun 2012 7:44 pm |
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BBDisco3
Member Since: 23 Nov 2008
Location: Cheshire
Posts: 3646
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| Re: A strange thing - maybe? |
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nigel207 wrote:On the A1 just south of Wetherby I pulled into the centre lane
Signed, PARANOID!
Came along there at 11pm last night but didn't notice anything - not too sure now which lane I was in. Will be passing again next week so will try to remember to keep an eye out.
Presume you were heading south and had passed the services.
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| 22nd Jun 2012 7:45 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1359
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Yes it was southbound, south of Wetherby on the uphill left hand bend section before Junction 45 - centre lane.
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| 22nd Jun 2012 7:49 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1359
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DSL wrote:Yep in the 520d, same(ish) 8 speeder as in the D4. Just a one off, never done it again despite trying to replicate. I don't think it was wheel spin with TC moderating it but it could have been s'pose.
Hmmmm. I'm towing the tin tent on Monday, so hopefully if there are any issues that should highlight them.
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| 22nd Jun 2012 7:52 pm |
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Grunders
Member Since: 30 Apr 2011
Location: Manchester
Posts: 2329
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When i drove and it felt as you state "the cattle grid effect" was when i had the dreaded EPB judder, might be a long shot but could be related... If it ain't broke... Take it apart anyway, how else you gonna find out how it works
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| 22nd Jun 2012 8:29 pm |
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MarsKy
Member Since: 23 Dec 2011
Location: Lanarkshire
Posts: 847
 
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Grunders wrote:"the cattle grid effect" was when i had the dreaded EPB judder
Had that recently with my D4 going along the M8 - most noticeable between 50-60mph.
Stopped and checked around and set-off again. Problem has not returned.
nigel207 wrote: I'm not sure whether I lifted off or not, but at the same time as the "cattle grid effect" there seemed to be no increase in power. There were no warnings or "bongs", and from then on the car drove perfectly again.
Was there a smell like burning rubber from the rear of the Disco?
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| 22nd Jun 2012 9:04 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1359
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Was there a smell like burning rubber from the rear of the Disco?
Not that I was aware of, and none of my passengers commented.
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| 22nd Jun 2012 9:08 pm |
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Ecosse
Member Since: 07 Jan 2005
Location: Grampian, Scotland
Posts: 889
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nigel207 wrote:Was there a smell like burning rubber from the rear of the Disco?
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Does the DPF cause a smell like that?, and are there any signs when it burns off the particulates? Only ask, as after normally doing short runs, I took a longer cross country run at reasonable speeds, but little use of brakes, and there was a burning rubber smell yet no warmth at all on any wheel or the brakes & I wondered whether teh car somehow "knew" that it was having a run that was suitable to burn the dpf?
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| 23rd Jun 2012 4:13 pm |
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ukdave104
Member Since: 31 Jul 2007
Location: Stonehaven
Posts: 266
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Traction control kicking in for a few seconds  , just a thought as you say you had no increase in power
2014.5 Discovery 4 HSE in Corris Grey Metallic - arriving this week.
2011 Range Rover Vogue 4.4 TDV8, now departing
2012 Freelander HSE SD4 Auto - Mrs UkDave104's Toy.
2010 Discovery 4 XS - gone
2008 Discovery 3 HSE - gone
2007 Freelander 2 GS TD4 - gone
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| 24th Jun 2012 7:24 pm |
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