Digsy
Member Since: 01 Feb 2014
Location: United Kingdom
Posts: 19
  
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With the recent spell of cold weather I've noticed that a significant shimmy when the engine catches. It feels like the whole engine rocks from side to side on its mounts (rocking the car slightly with it), probably no more than 2-3 times before it settles into a smooth idle. It only does this when the temp is say below 4 degrees. It's a 2011 Disco Landmark.
Is this a problem or a characteristic with the Disco 4?
Thanks in advance. 
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 20th Jan 2015 11:12 am |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72787
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Sounds like glow plugs either not allowed to work properly (left on long enough) or not working properly. My D3 does it slightly and I suspect glowplugs.
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| 20th Jan 2015 11:15 am |
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sacimiddx
Member Since: 09 Mar 2007
Location: hants
Posts: 2143
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possibly glowplugs, but not heard of any D4 glowplug issues .....yet Illegitimi Non Carborundum
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| 20th Jan 2015 11:58 am |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72787
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Are D3 & D4 glowplugs same or similar?
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| 20th Jan 2015 12:00 pm |
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discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
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| Re: Shimmy on cold start up |
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Digsy wrote:With the recent spell of cold weather I've noticed that a significant shimmy when the engine catches. It feels like the whole engine rocks from side to side on its mounts (rocking the car slightly with it), probably no more than 2-3 times before it settles into a smooth idle. It only does this when the temp is say below 4 degrees. It's a 2011 Disco Landmark.
Is this a problem or a characteristic with the Disco 4?
Thanks in advance.
All I can say is that mine (2010) does exactly the same as you describe, a momentary shake of the whole vehicle/engine/drivetrain in the first second after the engine fires. Only occurs on mine where the outside temperature is below about 2.
I'm afraid I cannot offer any advice as to the cause, other than to say it's not causing me any issues presently.
I do need a new battery though which is going on tonight so will see if that makes any difference (maybe in a less than healthy battery the amount of load taken to turn over and fire the engine doesn't leave enough power for the glowplug 'afterglow' function for a tiny moment, until the alternator spins up to full speed/output? Just a thought......)
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| 20th Jan 2015 1:05 pm |
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DigitalJunior
Member Since: 22 Nov 2008
Location: Cumbria
Posts: 4398
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Do you get a 'puff' of white/grey smoke on start-up as well once the engine catches ?
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| 20th Jan 2015 1:08 pm |
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evo8
Member Since: 29 Jan 2008
Location: Zalesie
Posts: 289
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Interesting. I have the same observation on my D4 (MY13). I press the start button (with brake pedal pressed) - car delays the starting of the engine until the glow sign dissapears - and the the starter kicks in. Engine starts immediatelly - but the run is not "smooth" for first 3-4 seconds - as if some cylinders are not firing properly.
On my old D3 - if I leave the glow sign dissapear and then start the engine - no shaking at all. 2013 D4 TDV6 S; Baltic Blue; IID Tool BT
2007 D3 TDV6 SE, Auto; club Faultmate MSV2
Last edited by evo8 on 20th Jan 2015 2:13 pm. Edited 1 time in total
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| 20th Jan 2015 1:14 pm |
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Digsy
Member Since: 01 Feb 2014
Location: United Kingdom
Posts: 19
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Not sure about smoke - I'll have to ask someone to stand behind when I start it.
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| 20th Jan 2015 1:14 pm |
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Sloss
Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1691
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It's a diesel engine gents - a fairly refined one but still diesel.
Back in the day you floored the loud pedal and cranked until it fired up and kept it revving pretty hard until it warmed up enough to idle.
Then they invented Glowplugs, turn the key a bit for a 'time' - you decided the time - then floor the pedal and try it.
Then they invented timing the glow, relating the time to temperature until we got to the sophisticated system we have now.
I could go on about pre-ignition chambers, indirect injection etc., etc.
In really cold weather I've lit some paper and stuck it in the air box while cranking. That was on old stuff that just did not like cold weather.
I remember lighting a paraffin soaked rag to start an ancient cement mixer, cawed (cranked) the handle and the rag went in and ended up round the inlet valve and half in the cylinder as there was no filter to catch it.
Had to remove the head to get the bits out. The budget didn't run to a new Head Gasket so back it went together and it ran for years after that......  Stew,
2010 D4 gone but I really loved it
Went back to Merc - C350 AMG
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| 20th Jan 2015 1:48 pm |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26701
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My 2013 is the same. I press the ignition on button without the brake first, this turns on the ignition, and lets the glowplugs heat up, when the light goes out I put my foot on the brake and press the button again. This seems to reduce the shudder.
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| 20th Jan 2015 1:53 pm |
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discoteca
Member Since: 08 Mar 2010
Location: Warwickshire
Posts: 1477
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digitaljunior wrote:Do you get a 'puff' of white/grey smoke on start-up as well once the engine catches ?
No not that I have noticed......
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| 20th Jan 2015 2:06 pm |
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The Boss
Member Since: 03 Sep 2011
Location: Cheshire
Posts: 32
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Same here with my MY13 when starting from cold. Perhaps it's a feature 2013/13 Discovery 4 HSE SDV6 - now sadly gone!
Baltic Blue/Almond
Privacy Glass
LR Tow Bar & Electrics
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| 20th Jan 2015 2:17 pm |
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adam
Member Since: 20 Sep 2005
Location: Home and Happy
Posts: 6917
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My MY10 does it - I do a double start - press button, no brake, let glow plug light go out, turn off, turn on again, wait for glow plug light to go out, press brake, start - reduced, if no shimmy. Will still sometimes get a puff of white smoke (not condensation)
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| 20th Jan 2015 2:26 pm |
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Advanced Factors
Site Sponsor
Member Since: 27 Nov 2012
Location: Southampton
Posts: 2648
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DSL wrote:Are D3 & D4 glowplugs same or similar?
Different glow plugs from the 2.7 to the 3.0 however still a consumable item and will fail at some point (as they will with every glow plug on the market)
Worth checking resistance at the plug connector for each glow plug. Paul Redding
+44 (0)23 8052 2774
Order Parts Online at www.advancedfactors.co.uk
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| 20th Jan 2015 2:54 pm |
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Advanced Factors
Site Sponsor
Member Since: 27 Nov 2012
Location: Southampton
Posts: 2648
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Sloss wrote:It's a diesel engine gents - a fairly refined one but still diesel.
Back in the day you floored the loud pedal and cranked until it fired up and kept it revving pretty hard until it warmed up enough to idle.
Then they invented Glowplugs, turn the key a bit for a 'time' - you decided the time - then floor the pedal and try it.
Then they invented timing the glow, relating the time to temperature until we got to the sophisticated system we have now.
I could go on about pre-ignition chambers, indirect injection etc., etc.
In really cold weather I've lit some paper and stuck it in the air box while cranking. That was on old stuff that just did not like cold weather.
I remember lighting a paraffin soaked rag to start an ancient cement mixer, cawed (cranked) the handle and the rag went in and ended up round the inlet valve and half in the cylinder as there was no filter to catch it.
Had to remove the head to get the bits out. The budget didn't run to a new Head Gasket so back it went together and it ran for years after that......
And then there was Bradex Easystart in a can! Paul Redding
+44 (0)23 8052 2774
Order Parts Online at www.advancedfactors.co.uk
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| 20th Jan 2015 2:55 pm |
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