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Thumping when accelerating from standstill
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marsie
 


Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804

England 2013 Discovery 4 3.0 SDV6 XS Auto Firenze RedDiscovery 4
Thumping when accelerating from standstill

i have noticed that when i go to accelerate out of a junction (especially in the wet) i get a thumping noise from underneath if i do it with any gusto but only if i have a bit of steering lock on-wont do it in a straight line no matter how hard i accelerate

Its hard to describe but its as though a spline is slipping and grabbing?? Not sure if its mechanical or electrical(i.e traction control being over sensitive)

I have also noticed that if i have the 4x4 info on the centre diff lock light regularly turns red momentarily when setting off from standstill

Anyone else had this or can shed any light, its due a cam belt change soon so will be making a trip to JAS if i cannot get to the bottom of it Thumbs Up
 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) 
 
Post #21782346th Oct 2020 7:45 am
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Gareth
Site Moderator 


Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26682

United Kingdom 

Could be an abs sensor giving dud info, or even mismatched tyres, are they all pumped up correctly? Steering angle sensor maybe?
I’m sure it will be an easy fix.
  
Post #21782396th Oct 2020 8:18 am
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RogB
 


Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1637

United Kingdom 

I think the centre diff lock illuminating red is normal, every LR model ive ever driven that has that function (DS, Evoque, RRS) the lock symbol shows partial or full engagement momentarily when pulling away or being enthusiastic round corners as the TC kicks in to ensure safety etc
 2011 D4 XS 305 MY12 - gone but not forgotten  
Post #21782446th Oct 2020 8:36 am
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Gary_P
 


Member Since: 03 May 2016
Location: Kent
Posts: 1505

Ukraine 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

Could the sound be because the rear prop bush has gone? Have you had it done? You could look for a split. Believe you may have to take off an underside tray/protection to see though.
Good luck
Gary
 Gary
-------------------------------------------

Discovery 4 HSE 2016MY 
 
Post #21782466th Oct 2020 8:43 am
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marsie
 


Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804

England 2013 Discovery 4 3.0 SDV6 XS Auto Firenze RedDiscovery 4

All the tyres are matched and correct pressure (only done a couple of thousand miles) but also did it with old tyres

Never noticed the red difflock light before but to be honest i have never looked before

Gareth may be onto something with the abs sensors, may try with dsc turned off and see if it makes any difference and will connect iid tool and see if there are any strange readings

prop was replaced about 15k ago before i got the car but will have a poke around

thanks for the pointers guys Thumbs Up
 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) 
 
Post #21790049th Oct 2020 7:14 am
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Yankee_Rover
 


Member Since: 02 Jun 2021
Location: Seattle
Posts: 183

United States 2008 LR3 4.4 V8 HSE Lux Auto Zermatt SilverLR3

Marsie, did you resolve your thumping issue? My Discovery 3 shows similar symptoms —slight thump/clunk when setting off from a stop while turning. It’s not “hard”, like you said it is almost like slack being taken up and then something catching. It’s not present at high speeds or when setting off straight.
  
Post #22337852nd Jun 2021 8:43 pm
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marsie
 


Member Since: 28 Feb 2010
Location: Sheffieldish
Posts: 1804

England 2013 Discovery 4 3.0 SDV6 XS Auto Firenze RedDiscovery 4

Similar symptoms to mine. Yes, was cured by changing the oil in the transfer box (twice) and doing an adaption reset/calibration. Must have been slipping/locking due to old oil but improved after one oil change and cured after 2 oil changes Thumbs Up

Hopefully yours will be a similar issue and not something more expensive Thumbs Up
Paul
 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) 
 
Post #22338963rd Jun 2021 10:51 am
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Yankee_Rover
 


Member Since: 02 Jun 2021
Location: Seattle
Posts: 183

United States 2008 LR3 4.4 V8 HSE Lux Auto Zermatt SilverLR3

Thank you, marsie!

Transfer Box was one of two suspected culprits I have not eliminated. I’ve eliminated CV shafts, steering rack, tie rods/arms, and sway bars. I checked a few other things for good measure —all fine (wheel bearings, control arms, ball joints).

While crawling around I did notice a small leak from my transfer box seal. I’ve actually ordered some fluid for it (expensive and not available at stock parts stores) so I could eliminate this from the list. Previous owner drained and refilled about 15 months ago. With a slow leak, the fluid level may have dropped enough to start causing problems. I’ll do the refill and calibrate, along with clearing the breather tube and hopefully that nips the problem long enough for me to rebuild the box. Vehicle is sitting until I can swap fluid.
  
Post #22339403rd Jun 2021 1:26 pm
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