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suspension suddenly rock hard
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grahamk
 


Member Since: 28 Feb 2010
Location: Dumgoyne
Posts: 1473

Scotland 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3
suspension suddenly rock hard

Hope someone can shed some light on this. The ride on the car has very suddenly gone rock hard. Bracing yourself when you see a pot hole type hard. The car goes up and down just fine, and is even on all 4 corners. Any ideas?
  
Post #107572521st Mar 2013 8:43 pm
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outofyorkshire
 


Member Since: 27 Apr 2009
Location: Emigrated to Notts
Posts: 1021

United Kingdom 2010 Discovery 4 3.0 SDV6 XS Auto Stornoway GreyDiscovery 4

If its rock hard it must be on bump stops. If it still goes up and down than can only assume you have a leak and it will not stay up Wink
 Cheers Ian
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Post #107573621st Mar 2013 8:56 pm
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grahamk
 


Member Since: 28 Feb 2010
Location: Dumgoyne
Posts: 1473

Scotland 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

It doesnt look like it is on the bump stops and it lowers and raises when the switch is activated. Its not as harsh as when it is on the bump stops but a hell of a lot rougher than it was a few days ago. The suspension stays elevated when the car is switched off so doesnt look like a leak..nit sure what else it could be. Crying or Very sad
  
Post #107573921st Mar 2013 8:59 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Your cross-link valve has failed.

Going to be bone-jaring till you get it replaced.

Thumbs Up

Quote:
Cross Link Valves

The cross-link valve provides a connection between the two air springs on the same axle. When de-energized, the cross-link valve prevents air passing from one air spring to another. When the solenoid is energized, the valve spool moves and allows air to pass from one air spring to the other. This increases wheel articulation and improves ride comfort at low vehicle speeds.
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Post #107574021st Mar 2013 9:00 pm
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grahamk
 


Member Since: 28 Feb 2010
Location: Dumgoyne
Posts: 1473

Scotland 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Big Cry now the ultimate question...how much...
  
Post #107575221st Mar 2013 9:18 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

For that you need to speak to TLO, but get your codes read and establish which components need replacing.

Some reading for you:

http://www.disco3.co.uk/gallery/albums/use...iption.pdf
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #107576121st Mar 2013 9:28 pm
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grahamk
 


Member Since: 28 Feb 2010
Location: Dumgoyne
Posts: 1473

Scotland 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Much appreciated. Cheers robbie
  
Post #107576421st Mar 2013 9:31 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Your welcome.

Thumbs Up
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #107576721st Mar 2013 9:33 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Is it from the front or rear, or both ends?
Does it knock, or rattle from the underside at all?
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Post #107577421st Mar 2013 9:42 pm
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grahamk
 


Member Since: 28 Feb 2010
Location: Dumgoyne
Posts: 1473

Scotland 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

No noises rattles or knocks, or messages except noise from all the rubbish inside going airbourne when I go over a bump.
  
Post #107578721st Mar 2013 9:57 pm
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Shutts
 


Member Since: 26 Nov 2011
Location: Tiptree
Posts: 146

United Kingdom 2005 Discovery 3 TDV6 SE Manual Tonga GreenDiscovery 3

I'm having the same issue but thought the suspension was at the end of its serviceable life as it had done 180k. Replaced all 4 units last weekend but still feels like I'm going down a cobbled street.

Is there anyway to test the cross-link valves with a IID tool? I have checked the live values but when driving along both front and rear stay on 0%

Any advice will be greatly appreciated.
Andy
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2005 D3 SE
1998 Disco 300tdi - slow play thing
1995 Defender 300tdi - Winching play thing
Aprilia RSV 1000 - fast play thing
Honda CR250 - noisy play thing

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Andy's Landy's - http://www.andys-landys.blogspot.com
Suspension checking workbook - http://www.disco3.co.uk/gallery/albums/use...k_v002.zip 
 
Post #20345256th Mar 2019 10:03 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi

Did the suspension all of a sudden feel like u was driving on a cobble street or over time

Have u checked to see what the height is at normal suspension height , should be

Front 465mm
Rear 485mm

Measured from the centre of the wheel to the bottom of the wheel arch

Cross over link valves open when u disable the DSC, for off road driving which simulates a live axle where as one strut is pushed up the strut on the other same axle goes down

Here’s a suspension pdf info


http://media.disco3.co.uk/gallery/albums/u...iption.pdf

Have u looked to see what the iid live data is when ur compressor is running , here’s a chart of what they should be

Hope that helps Thumbs Up


   
Post #20345466th Mar 2019 11:23 pm
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Shutts
 


Member Since: 26 Nov 2011
Location: Tiptree
Posts: 146

United Kingdom 2005 Discovery 3 TDV6 SE Manual Tonga GreenDiscovery 3

It seemed quite gradual from memory but I have been living with it for a long time.

I reset the suspension heights a couple of time and they seem fine.

I also have checked the compressor pressure and its within tolerance. A few thing I have noticed is:
1 - The pressure drops gradually down to about 100ish PSI
2 - If I go to off road height once the pressure has dropped it instantly raises to about 220 PSI
3 - With the pressure at 250ish PSI when the compressor relay off, if I go to off-road height then back to normal height the pressure drop to about 60PSI but the compressor doesn’t come on.

I have checked and there is a air leak on one of the VOS valves on the compressor dryer, the top one. My assumption is that the pressure sensor is between the compressor and the suspension and not on the reservoir itself. This assumption is based on fact that the pressure drops off slowly then jumps instantly when I change height.

With that said if the pressure sensor is on the link between the compressor and the suspension I would have expected the compressor would kick in as the pressure dropped to about 100PSI, or will it only kick in then the residual pressure is hit.

With regards to the cross-link valve I monitored the values and did the following:
- Turned off DSC
- Changed to off-road height
- Went through all the special programs
At no point did the cross-link values change from 0%. I would have thought that if the valve was faulty then I would get an error code, or does that only happen if there is a wiring problem and not if the valves have failed or are sticking.

Andy
 |____000_
[l_|__\___\,___
l--___--_[O==O]
()_)' '()_)-----()_)

2005 D3 SE
1998 Disco 300tdi - slow play thing
1995 Defender 300tdi - Winching play thing
Aprilia RSV 1000 - fast play thing
Honda CR250 - noisy play thing

Essex Land Rover Club member
-
Andy's Landy's - http://www.andys-landys.blogspot.com
Suspension checking workbook - http://www.disco3.co.uk/gallery/albums/use...k_v002.zip 
 
Post #20346227th Mar 2019 10:51 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi

Thks for the info , the pressure sensor is fitted on the reservoir valve block , it sounds like because you’ve got a leak the compressor has been trying to keep up

Imagine the reason the cross link % readings aren’t changing when DSC is disabled as i assume there has to be certain amount of travel from the suspension , same way a live axle changes

So indeed I think ur first port of call would be to fix that leak on the dryer and check the rest before going any further , otherwise ur just end up burning ur compressor out

The suspension ecu looks for a message from the pressure sensor , so if it doesn’t get it will stop or prevent the compressor coming on

See how u get on after you’ve fixed the leak and any others u may find , can then test that by putting the vehicle into off road height , pull fuse F26 and leave over night , then see if it’s dropped as you’ve got to have an air tight system before moving onto anything else
   
Post #20351498th Mar 2019 11:49 pm
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Longy
 


Member Since: 03 Mar 2023
Location: Nottingham
Posts: 27

United Kingdom 2012 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

Did you manage to get to the bottom of this issue, I have very similar issues, wondering if you managed to diagnose and repair?
  
Post #236017527th Jan 2024 7:47 pm
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