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Suspension Guru Needed!
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3
Suspension Guru Needed!

Hi all

I have a new to me 2007 lr3. Has 115,000kms on it and is in excellent shape.
When I bought the truck I was told and knew it needed a new suspension compressor. This was diagnosed by a very reputable local Land Rover specialty shop.
Truck was throwing error codes:
-reservoir pressure rising too slowly c1a20
-pressure increasing when system inactive
-exhaust valve fault
-front left height sensor faulty

Thinking the truck has the original hitachi compressor I ordered a rebuild kit.
When I go to rebuild the compressor I find it has a 2015 amk with 30.000kms on it since installation.
I replaced the center and front valve blocks with brand new oem parts. Replaced height sensor.
Replaced the compressor with a new amk.

Now I’m only getting the c1a20 code. Only throws when I drive on rough / uneven terrain. Driving on smooth pavement / streets is fine.

If I pull the fuse I do NOT loose any height or air. I can drive for 2 days on dirt roads and not loose any height. Aka no leaks between front / rear valve blocks and struts.

When the suspension fault happens, my front left shock drops to bump stops on 5-10 seconds. All other corners are OK. Restarting truck clears codes.


Any ideas on what my issue is?
Could it be caused by a bad battery which I suspect I have?
Out of date software?
Pipe leak?
Intake pipe blockage?



I do not believe it is a pipe or reservoir leak,,,,, when I unscrew the pipes at the valve
Blocks to change them out the car had been sitting for 3 days and air was leaking out of them when I unscrewed the fitting. I’m at a total loss of what this could be and have thrown a lot of money of new parts chasing this down...
Thank you!!
  
Post #215508419th Jun 2020 6:01 am
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Sidestick
 


Member Since: 22 Apr 2012
Location: Rome
Posts: 2286

Italy 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Best course of action is to find someone with an iidTool and diagnose compressor pressure and temperature, valve blocks and height sensors with it Thumbs Up

From your description it sounds to me like an height sensor calibration missmatch Whistle
 - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT 
 
Post #215516319th Jun 2020 11:31 am
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Globetrotter448
 


Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1771

Australia 2007 Discovery 3 4.0 V6 Petrol SE Auto Java BlackDiscovery 3

Maybe front valve block for that side has old desiccant in it
  
Post #215518719th Jun 2020 12:33 pm
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3

Sidestick wrote:
Best course of action is to find someone with an iidTool and diagnose compressor pressure and temperature, valve blocks and height sensors with it Thumbs Up

From your description it sounds to me like an height sensor calibration missmatch Whistle



I have 4dcan from rsw.
i can view the compressor pressure and temperature.
pressure rises to 255 before kicking off. but i dont know or have a reference to how fast it should be building to know if its slow or normal?
i dont have any temperature faults... what should i be looking for there?
also with the pressure, what should i be watching for there? if i lower then raise the vehicle how long should the compressor run for to replace the air used?

i can calibrate and view height sensors, but i cant see their voltage only their reading. the front left corner is level with the right,, height isnt off after replacing so i didnt adjust anything.
  
Post #215526619th Jun 2020 4:45 pm
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3

Globetrotter448 wrote:
Maybe front valve block for that side has old desiccant in it


i cleaned/rebuilt the old front valve block after replacing the compressor. it was clean. 2 weeks later i replaced the front valve block with a new one. no desiccant in the system anywhere from any valve blocks at any time so i dont think this is the problem for me, plus valve block air leakage is not giving me issues when the fuse is pulled so it wouldn't be a leaking seal.
  
Post #215526719th Jun 2020 4:47 pm
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waterbuoy
 


Member Since: 26 Oct 2013
Location: Argyll
Posts: 2855

United Kingdom 2009 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3
Re: Suspension Guru Needed!

Nedarb2 wrote:

Truck was throwing error codes:
-front left height sensor faulty

When the suspension fault happens, my front left shock drops to bump stops on 5-10 seconds. All other corners are OK. Restarting truck clears codes.


Might there be a clue here? I'm no expert but codes and symptoms pointing to the same corner may not be a coincidence.
 Currently 2009 Disco 3 SE and 2013 MY D4 HSE
Previously:
TD5 Defender 110 CSW (230k miles)
300TDi Disco 1 (289k)
4 RR Classics (300-350k each, 2 manual, 2 auto)
110 V8 CSW (220k)
S3 109 hi cap pickup (ex RN)
S2A 88 Safari SW with lpg conversion (bloody lethal) 
 
Post #215527119th Jun 2020 5:07 pm
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3

I agree. Like i mentioned When i get the suspension fault now that corner still drops down to the bump stops but NO codes/errors being thrown anymore in regards to height sensor. im not sure why the air pressure slow to rise would be linked to the front right corner but i know this eas system does weird things!

I replaced the height sensor last night. i did NOT re calibrate but the truck it is essentially level (i haven't measured it but looks fine) but i CAN do that if required but i cant see 5 or even 10mm of height difference causing a problem plus no sensor code being thrown. hmmmm
  
Post #215527419th Jun 2020 5:22 pm
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Sidestick
 


Member Since: 22 Apr 2012
Location: Rome
Posts: 2286

Italy 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

After height sensors change a recalibration is mandatory, inside the suspension ECU are stored the old values.

With your diagnose tool try to drive looking at height sensors live data and check for any flickering or out of scale value Idea

255 kpa is a quite low, 1680 kPa should be the right one
 - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT 
 
Post #215530219th Jun 2020 6:52 pm
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3

Thanks. Ill re-calibrate tonight and report back.

255psi is when the compressor cuts out - so that's 1758 kpa - quite a bit higher than 1680.... so could that be a software issue??!
  
Post #215533419th Jun 2020 8:09 pm
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JMack
 


Member Since: 02 Aug 2014
Location: Edinburgh
Posts: 1517

Scotland 2006 Discovery 3 TDV6 Commercial Manual Java BlackDiscovery 3

There is a software update for fitting an AMK in place of a Hitachi compressor.
  
Post #215548720th Jun 2020 1:53 pm
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pagoda
 


Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1923

Canada 2016 LR4 3.0 SDV6 Landmark LE Auto Yulong WhiteLR4

Nedarb2 wrote:
Thanks. Ill re-calibrate tonight and report back.

255psi is when the compressor cuts out - so that's 1758 kpa - quite a bit higher than 1680.... so could that be a software issue??!


Worth checking you have the correct software for the correct compressor. LR main dealer replaced by compressor but failed to change the software to the new brand, which resulted in numerous suspension issues that appeared on an irregular basis.
 PAGODA  
Post #215552520th Jun 2020 4:52 pm
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3

Ok, update for ya'll.

1) i am booked into the dealership Wednesday to check software.

2) i watched all the height sensors while driving over un even terrain. no crazy spikes or missed readings, but on extreme angles some sensors went out of range (i think the max reading was 255 or so.... if it went over this it would start counting up from 1 again - but i did NOT get a suspension error, or any others, when this happened)

3) watching the tank pressure, as soon as driving over rough terrain my air pressure plummets from full (255psi/1760kpa) down to the 120-160 (830-1150kpa). So, is it normal/correct for air pressure to drop / be consumed / used big time when on rough / uneven terrain? as mentioned before if i pull the fuse i DONT loose any air when on rough terrain. this must be the source of my problems - for some reason using a ton of air and then the compressor cannot keep up... its drops from 255 to 120-160 in about 5 seconds, and takes 3-5 minutes to rebuild to reservoir.

any ideas on this?


4) removed the compressor intake pipe to see if pressure would rebuild faster - no difference so no intake pipe blockages restricting air intake

5) checked with soapy water for air leaks all between the compressor and reservoir - none found
  
Post #215556920th Jun 2020 8:35 pm
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Sidestick
 


Member Since: 22 Apr 2012
Location: Rome
Posts: 2286

Italy 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

The pressure drop is normal, the air gallery is exhausted at every fill in of the air tank in order to permit a good compressor restart (without the resistance of compressed air in the gallery).

There is something wrong in the height sensor, they should NOT go out of range along the entire articulation of the suspension Confused

Do you fit shortened height sensors rods?
 - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT 


Last edited by Sidestick on 21st Jun 2020 4:24 pm. Edited 1 time in total 
Post #215574121st Jun 2020 4:13 pm
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3

I believe to have this figured out. New rear valve block is on order.

-pressure isn’t dropping when I hit Un even terrain - it’s INCREASING. Once I realized that while watching the pressure carefully driving around last night everything made sense (again, to be proven).
The compressor was then exhausting the pressure build up so it could restart.
The articulation in the rear - I’m saying rear becaus the front is a brand new valve block - is leaking air past the valve block on compression when the pressure increases. Valve block doesn’t leak with car sitting still and just minor / slow leakage on smooth ground.
No air is lost when fuse is pulled because a) no leaks to outside world in system and b) exhaust valve is deactivated.
  
Post #215574421st Jun 2020 4:23 pm
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Nedarb2
 


Member Since: 19 Jun 2020
Location: Canada
Posts: 23

Canada 2007 LR3 4.4 V8 HSE Auto Stornoway GreyLR3

ok. im still in the dog house with this.

new front, center, and rear valve blocks have been installed.
when driving over bumps, pressure drops from full to 120 range almost instantly now. compressor runs constantly to refill it.

new amk compressor installed.

NO LEAKS between valve blocks and shocks as per pulling fuse and leaving truck over night.
NO LEAKS or suspension height is lost when fuse is pulled and i drive around for 6+ hours including off road driving.


So, if air isnt leaking past the valve blocks and providing head pressure to the compressor which is being exhausted it out which was the last running theory, WHY else is air seemingly being told to exhaust away?

i dont believe i should be looking at why or if air is being lost going from the compressor to the shocks, im trying to figure out why air is being lost from the shocks and out of the system if it doesnt happen when the fuse is pulled.

no ride height error codes
only error is air pressure slow to rise.
  
Post #215691027th Jun 2020 3:15 am
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