David Skeggs
Member Since: 31 May 2008
Location: paris
Posts: 4
  
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driving at a xonstant speed the motoe hunts up to 500 rpm
why? does not do all the time but oftern
what sensor to replace?
thanks
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 31st May 2008 11:45 pm |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
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Mine is also doing this. It seems to be worst when the engine is under a slight load, like climbing a long gradual hill. I understand that quite a few other D3's do this also.
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| 1st Jun 2008 8:39 am |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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Isn't this just the Anti-Stall mechanism coming into play? Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
See It Here
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| 1st Jun 2008 11:40 am |
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catweasel
Member Since: 05 May 2006
Location: Bundaleer
Posts: 4805
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why would an auto require antistall 
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| 1st Jun 2008 11:57 am |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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errr I dunno... but I thought they all had them...... Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
See It Here
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| 1st Jun 2008 12:39 pm |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
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I think what he means is the revs 'hunting' up and down at a steady speed.
My car for example, when cruising at 70mph is doing a steady 2000 rpm on a flat road. If I come to a slight hill and want to maintain 70mph, the revs will start to fluctuate up and down on about a 1 second cycle. The steeper the hill the more the fluctuation.
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| 1st Jun 2008 12:58 pm |
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catweasel
Member Since: 05 May 2006
Location: Bundaleer
Posts: 4805
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thats odd, normally it stops when the engine works harder. I have had this sort of thing on one of my other vehicles (petrol) and when running at a constant speed would fluctuate. it ended up being a loose keyway in the crank for the timing gear which is why it stopped when pressure was applied to the crank and didn't allow it to flop around so much.
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| 1st Jun 2008 1:08 pm |
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AN
Member Since: 26 Jul 2005
Location: Hungary
Posts: 327
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Mine is similar, but not the same as Gareth's. It moves around 300rpm at 30 mph at steady speed, but if I accelerate it works OK (no hunting). Maybe something to do with early model, all car mentioned on this post are 2005 MY. LR D3 S Black, Auto TDV6
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| 1st Jun 2008 1:14 pm |
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countrywide
Member Since: 16 Sep 2007
Location: UK
Posts: 6019
 
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catweasel wrote:why would an auto require antistall
Apparently you can stall an auto, never done it myself, but I am sure TFC posted something about it.
How does the anti stall work.
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| 1st Jun 2008 1:16 pm |
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Ocsid
Member Since: 29 Nov 2005
Location: Hampshire
Posts: 255
 
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Are you not seeing the consequences of the fluid coupling hunting between "lockup and unlock"?
I have observed this on slightly undulating roads where its not enough to prompt a gear change and thought that was the reason.
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| 1st Jun 2008 2:14 pm |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
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I think you are right Ocsid. I'm not sure if it is a fault or not. Mine has done it for ages, but it seems to be worse now the miles are getting higher (100k).
Is your 2007 the same as your original D3 in this respect?
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| 1st Jun 2008 2:33 pm |
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Jimbob Squarepants
Member Since: 27 Oct 2007
Location: Miles Away from Home
Posts: 1063
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I stalled an auto once  (Not a Land Rover) Too much intellectual firepower can damage your common sense.
Last edited by Jimbob Squarepants on 1st Jun 2008 2:57 pm. Edited 1 time in total
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| 1st Jun 2008 2:42 pm |
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Ocsid
Member Since: 29 Nov 2005
Location: Hampshire
Posts: 255
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Gareth wrote:I think you are right Ocsid. I'm not sure if it is a fault or not. Mine has done it for ages, but it seems to be worse now the miles are getting higher (100k).
Is your 2007 the same as your original D3 in this respect?
I have not noticed any difference between the 2005 and 2007My's
Its certainly not a fault but a positive design feature and aim to cut losses.
If you are noticing an increase magnitude in rpm change this could be that the coupling "fill" is slightly down and it should be topped up. Whilst is nominally a "for life" fill I think there is a dealer route to topping it up.
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| 1st Jun 2008 2:51 pm |
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Neil Pettersen
Member Since: 23 Nov 2007
Location: Cutting the grass
Posts: 1254
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James R wrote:I stalled an auto once (Not a Land Rover)
You can stall an auto Corolla petrol by rolling backwards down hill(whilst in D ).......rental cars,
can teach ya all sorts ! 
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| 1st Jun 2008 9:57 pm |
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David Skeggs
Member Since: 31 May 2008
Location: paris
Posts: 4
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Thanks for the reply’s but unfortunately not an answer? At least I now know I am not alone with this problem.
More info & explanation:
I also thought that this was changing between gears in auto.
Quickly found that this also happened in manual mode, and to my surprise at one speed in 5th & the same speed (but more rev’s) in 4th!!
This is an effect that is not confined to gradient change – or a gradient; is a perfictly possible “happening» on basically flat roads.
Bizarre! Will be doing the phenomena and then with no apparent parameters change, stop behaving in this manner.
So humble conclusion (so far) is that there is a fuel delivery ‘hic’ or some air/ fuel C°2 / N°x / Monoxide / ? , control burn control system, that is sometimes confused (like me now).  bbbbbbbbbbbbbbbbbbbbbb
All additional technical input will be gratefully received.
David Skeggs
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| 2nd Jun 2008 8:36 am |
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