SLS.

[V8Ian]

Last week I noticed, as it was parked, the right rear suspension was low. A short drive and the rear suspension was far more compliant than usual. During the drive home, a few days later, the rear became low and harsh.
I suspected a leaking RH bag or broken air line. Today was the first opportunity to investigate and the RH bagappears inflated (very solid to touch) but running on the bumpstop.
This leads me to believe the issue is with the ride height valve. Is there a RHV for each side of the car?

[Tins]

Last week I noticed, as it was parked, the right rear suspension was low. A short drive and the rear suspension was far more compliant than usual. During the drive home, a few days later, the rear became low and harsh.
I suspected a leaking RH bag or broken air line. Today was the first opportunity to investigate and the RH bagappears inflated (very solid to touch) but running on the bumpstop.
This leads me to believe the issue is with the ride height valve. Is there a RHV for each side of the car?

Yes. 12 and 13 in the second pic.

169701169702

[sierrafery]

I doubt this has anything to do with an air valve, it's more likely the bag especially if it keeps the level while driving. As long as it's on the bump stop it's clear that there's not enough air in that bag. Better replace it before the compressor burns out as it works in excess to compensate for the leak

[V8Ian]

The bag appears to be holding air, albeit not at the right height. This occured just after a number of reasonably deep water crossings. Both bags are Contis, a couple of years old.

169712

[sierrafery]

Then maybe the height sensor but a valve is the last suspect IMO

[V8Ian]

Then maybe the height sensor but a valve is the last suspect IMO
That was going to be my first port of call.

[V8Ian]

169736

These numbers relate to what?
The compressor doesn't seem to be working. I can neither hear nor feel vibration from it with the ignition on.
I have substituted a known, working relay to no avail, eliminating that as a cause.
Check fuse, good.
How do I check the compressor and ride height sensors?
The RH side is lower than the L, but both are down.

[sierrafery]

Those are values related to heights as nanocom calculates them.

sensor value: This shows the current height value of the air suspensionheight sensor. A value of 1 is equal to approximately 1.4 mm between the wheel arch
and ground.

Go to Utility - Calibration, you can activate the compressor from there to raise each side, each start will work for about 1cm. Make sure all the doors are closed and do it with engine running then when all is even store heights... though check at lesst visually the height sensors first eventually disconnect the battery and give some contact spray in the plugs

[V8Ian]

I've done a visual on the sensors, there's no apparent physical issues.

[V8Ian]

Those are values related to heights as nanocom calculates them.

sensor value: This shows the current height value of the air suspensionheight sensor. A value of 1 is equal to approximately 1.4 mm between the wheel arch
and ground.

Go to Utility - Calibration, you can activate the compressor from there to raise each side, each start will work for about 1cm. Make sure all the doors are closed and do it with engine running then when all is even store heights... though check at lesst visually the height sensors first eventually disconnect the battery and give some contact spray in the plugs
I tried that with the Nanocom, the car didn't lift at all, despite four or five tries. Does this confirm that the compressor is kaput?

[lewy]

Does this confirm that the compressor is kaput No it also could be that there is nothing telling the compressor to turn on,I would get a test light on the connection at the compressor first and make doubly sure that the doors are closed.One little mod i done with mine is interupt the power supply to the compressor and fit a tiny led into the cab that lights when the compressor is working.

[sierrafery]

I tried that with the Nanocom, the car didn't lift at all, despite four or five tries. Does this confirm that the compressor is kaput?
If it kicked in on requeast and no pressure to the bag it's very likely that the pump is worn, that's why they sold so much kits like this Landrover Discovery 2 Air Suspension Compressor WABCO Pump Repair Kit Rqg100041 for sale online | eBay (https://www.ebay.com/c/872870266'mkevt=1&siteid=1&mkcid=2&mkrid=711-153320-877673-6&source_name=google&mktype=dsa&campaignid=9475911115&groupid=104395800844&crlp=488806424530&keyword=&targeted=dsa-903809783894&MT_ID=b&adpos=&device=c&googleloc=1011794&geo_id=167&gclid=Cj0KCQjwo-aCBhC-ARIsAAkNQiuCjwG1BmHF-rLhE-ilbqojyFw9iO3HwVV5MKHeztLdtbh7V2z4yRMaAtzDEALw_wcB )

[AK83]

I tried that with the Nanocom, the car didn't lift at all, despite four or five tries. Does this confirm that the compressor is kaput?

I would check to see if the relay is switching first. This is only to save getting under the car, when it may be something else!

As you have the Nanocom, with bonnet open and using the Nanocom to activate the SLS(ie. compressor) Relay R5 should click even if compressor is kaput.

You reckon you checked the fuse .. in the engine bay fuse box? This should be fine as it powers up a few other functions too(like ABS and SLABS)

If you hear the click(or you may have to feel it, if engine is running) of the relay, I would then suggest you check the connector under the (engine) fuse box from the relay .. again, just to be sure power is going to the (possibly kaput) compressor.
This connector/wire is easy to spot. Should be a single connector under the fusebox, with nice thick white and black(tracer) wire going down to the compressor.

As I remember using the nanocom you should be able to activate compressor without the engine running ie. to keep things quiet to hear the relay click.

Now, assuming that the black and white wire to the compressor is getting it's power to the compressor, one last thing to check before condemning the compressor to 'kaputness' will be down at the compressor plug. Twin wire plug, white and black as said before, and the black earth wire .. make sure the earth is connected to earth(continuity or resistance test)
Could be a weak earth path or something, so high resistance and hence not getting enough power into compressor or something.

[James NZ]

Hi,

based on my experience the brush holder corrodes, probably caused by river crossings and condensation. If the pump is kaput but the motor goes before spending money on kitting the pump, strip the electric motor off and remove the brush holder and check for corrosion. I've had two motors with corroded brush holders that have parted company with the metal plate thingy.

I think the motors are supposed to be sealed, but that just means any water that gets in can't get out.

cheers, james nz

[Tins]

.

I think the motors are supposed to be sealed, but that just means any water that gets in can't get out.

cheers, james nz

Never a truer word spoken, or written in this case.

[V8Ian]

I've established the compressor is running, yet to prove it is actually making pressure.

[V8Ian]

Those are values related to heights as nanocom calculates them.

sensor value: This shows the current height value of the air suspensionheight sensor. A value of 1 is equal to approximately 1.4 mm between the wheel arch
and ground.

Go to Utility - Calibration, you can activate the compressor from there to raise each side, each start will work for about 1cm. Make sure all the doors are closed and do it with engine running then when all is even store heights... though check at lesst visually the height sensors first eventually disconnect the battery and give some contact spray in the plugs
The options are left or right and raise/lower. Does the raise/lower refer to the vehicle height or bag pressure?

[pop058]

The options are left or right and raise/lower. Does the raise/lower refer to the vehicle height or bag pressure?

Same thing I would have thought

[V8Ian]

Same thing I would have thought
Yeah, I realised that after I'd posted. I was trying to get the air out of the bag with the axle hanging.
I'm further leaning towards a defective sensor. Regardless of where I move the disconnected (from the trailing arm), I cannot inflate or deflate the bag. Even at full droop, there is too much pressure in the bag to remove it.
Is there a test for the sensor?

[sierrafery]

You can watch the sensor input while you are raising that side with a jack, it should react to the movement and once both sides are equal the inputs should be close

[Blknight.aus]

value relates to height not pressure,


roughly,
pressure only relates to how much effort is needed to hold the weight of the vehicle, the volume of air at that pressure sets the height. up the weight without upping the pressure and the vehicle squats, drop the weight without dropping pressure and it rises.



it may be the valve block or the bag.


I doubt its the pressure as one side is responding normally, (you have checked that both sides go up and down right?

[V8Ian]

Neither side goes up since I jacked it up.

[V8Ian]

I've decided it's the compressor. It makes the noises but not the volume. Now to find a compressor before Easter. [bigsad]

[pop058]

I've decided it's the compressor. It makes the noises but not the volume. Now to find a compressor before Easter. [bigsad]

I believe they can be rebuilt.

[Tins]

I believe they can be rebuilt.

By Ian? Before Easter?

[Tins]

Thing is, you are not limited to LR only. The Wabco compressor appears in quite a lot of Euro cars.

[V8Ian]

They can be rebuilt, but I doubt I'd get the parts before Easter. I'll try to source a used one to get me going, then recon the buggered one.

[Tins]

They can be rebuilt, but I doubt I'd get the parts before Easter. I'll try to source a used one to get me going, then recon the buggered one.

Check VW type, or Benz, wreckers Ian.

[V8Ian]

Cheers John, I believe Audi and Bentley too, although I can't recall seeing a Bentley wrecker in Ipswich. [biggrin]

[Blknight.aus]

if its a temp fix, chuck a decent 12v compressor in the back extend the airlines and the wiring

[Tins]

Cheers John, I believe Audi and Bentley too, although I can't recall seeing a Bentley wrecker in Ipswich. [biggrin]

Can't imagine you'd see a Bentley, let alone a Bentley wrecker, in Ipswich. But, I did say VW type. Both Audi and Bentley fit into that category, along with Skoda and SEAT... Oh, and Bugatti. Might find one of those on Roderick Street.

[V8Ian]

Can't imagine you'd see a Bentley, let alone a Bentley wrecker, in Ipswich. But, I did say VW type. Both Audi and Bentley fit into that category, along with Skoda and SEAT... Oh, and Bugatti. Might find one of those on Roderick Street.
I'll check Lobb St.. [bigrolf]

[Tins]

I'll check Lobb St.. [bigrolf]

Bit of a walk for an old fella.

[V8Ian]

if its a temp fix, chuck a decent 12v compressor in the back extend the airlines and the wiring
Dave, can I inlate the bags from the lines, if i disconnect them from the front of the compressor? Or are the check valves on the compressor side of that option?

[lewy]

you need to make up one of these.any hyd hose mob will have the bits or truck spares. 6MM Air Suspension Emergency Repair Kit - Land Rover Discovery 2 / 3 - L318 L319 | eBay (https://www.ebay.com/itm/6MM-Air-Suspension-Emergency-Repair-Kit-Land-Rover-Discovery-2-3-L318-L319-/192662473158)

[sierrafery]

you need to make up one of these.any hyd hose mob will have the bits or truck spares. 6MM Air Suspension Emergency Repair Kit - Land Rover Discovery 2 / 3 - L318 L319 | eBay (https://www.ebay.com/itm/6MM-Air-Suspension-Emergency-Repair-Kit-Land-Rover-Discovery-2-3-L318-L319-/192662473158) IMO that's not a good ideea at all cos once the bags are inflated the air will "navigate" from one bag to the other at each curve and the vehicle will be very "floppy", the better way is to use two schrader valves connected to a piece of pipe each, one for each side and connect them directly to the bags then inflate one side at a time
https://www.ebay.com/itm/DISCOVERY-2-AIR-SUSPENSION-PUMP-AIR-SPRING-MANUAL-INFLATION-BYPASS-4MM-OD-VALVES/282534767304 (https://www.ebay.com/itm/Schrader-Tyre-Valve-to-6MM-Air-Line-Land-Rover-Range-Rover-Air-Suspension/192681299758?_trkparms=aid%3D1110006%26algo%3DHOME SPLICE.SIM%26ao%3D1%26asc%3D231488%26meid%3Db30bdd 418ce24d5aa76dd22ce8c2bcc2%26pid%3D101195%26rk%3D2 %26rkt%3D12%26mehot%3Dpf%26sd%3D192662473158%26itm %3D192681299758%26pmt%3D1%26noa%3D0%26pg%3D2047675 %26algv%3DSimplAMLv9PairwiseUnbiasedWebDarwoV3&_trksid=p2047675.c101195.m1851)

[sierrafery]

The pipe with the T piece can be used for the following setup then the system will work normally cos the exhaust valve of the original compressor is needed too

169822

[ChookD2]

I've decided it's the compressor. It makes the noises but not the volume. Now to find a compressor before Easter. [bigsad]

Try that number I sent you, he is on here but can't remember his handle. Don't think he comes in here much anymore, he does most if his stuff on facebook and ebay (https://www.ebay.com.au/usr/landynut_ptyltd?_trksid=p2047675.l2559).

[V8Ian]

Try that number I sent you, he is on here but can't remember his handle. Don't think he comes in here much anymore, he does most if his stuff on facebook and ebay (https://www.ebay.com.au/usr/landynut_ptyltd?_trksid=p2047675.l2559).
I found him on eBay too. He's got other stuff I want, but not a compressor.

[biggin]

I could be wrong, and usually am, but I thought the tube is 4mm on a D2.

[sierrafery]

I could be wrong, and usually am, but I thought the tube is 4mm on a D2. :thumbsup: You are certainly right, 4mm it is, i missed that important detail as i was carried away by the other link with the T piece, these are OK DISCOVERY 2 AIR SUSPENSION PUMP AIR SPRING MANUAL INFLATION BYPASS 4MM OD VALVES | eBay (https://www.ebay.com/itm/DISCOVERY-2-AIR-SUSPENSION-PUMP-AIR-SPRING-MANUAL-INFLATION-BYPASS-4MM-OD-VALVES/282534767304) , i'll edit my previous post too

[ChookD2]

I found him on eBay too. He's got other stuff I want, but not a compressor.

He also has stuff that is not on ebay. Lots of stuff.

[Tins]

He appears to be wrecking a D2 atm. Dunno if it has SLS. He's in burpingarry.

Wrecking Land Rover Discovery 2 V8 | eBay (https://www.ebay.com.au/itm/Wrecking-Land-Rover-Discovery-2-V8/313030023068?hash=item48e20b179c:g:RxgAAOSwRYReb8f r)

[Blknight.aus]

you can get schreader valves on 4mm line joiners, one per side for the quick fix then t piece it in later, or t piece it straight in and put the schreaders somewhere easy to get to.

[pop058]

He appears to be wrecking a D2 atm. Dunno if it has SLS. He's in burpingarry.

Wrecking Land Rover Discovery 2 V8 | eBay (https://www.ebay.com.au/itm/Wrecking-Land-Rover-Discovery-2-V8/313030023068?hash=item48e20b179c:g:RxgAAOSwRYReb8f r)

That is Richard (Landynut) Holden. Very active on FB and evilbay but not on the forum IIRC. Has LOTS of LR stuff.

edit. He has moved (still in the same general area) not that long ago.

[V8Ian]

That's the plan Dave. I'll fit the s/h compressor tomorrow and investigate a safe route to the fuel filler compartment.
The s/h compressor will give me breathing space to source a rebuild kit from bagpipingandy.
I also got a new fan and hub from your expensive mates, Borg Warner price, generic label. [bigsad]

[V8Ian]

She lives again, with the new compressor. Like having a nip and tuck, no more saggy bum. [bigsmile1]

[AK83]

She lives again, with the new compressor. Like having a nip and tuck, no more saggy bum. [bigsmile1]


:confused:

Wha? .. you don't like the saggy bum look?(and yes we're talking D2 SLS types only here!!)

My not yet started D2 project has had this look for a good couple of years now .. and my 18yo nephew and his mate came around one day recently and loved it's go fast stance!
Apparently the nose up/bum down .. lowrider .. type look seems to be a thing again with the millennials.

[V8Ian]

The original intention was to recon the original unit and refit it immediately. The difficulty fitting it demands a rethink. I'll rebuild as planned but unless needed it can sit on the shelf.

[Tins]

Was the replacement one new, Ian?

[V8Ian]

No John, so it might last a week or a decade.

[Tins]

No John, so it might last a week or a decade.

With all the panic up there how long it lasts may be moot.

[lewy]

you mentioned at the start that it was down one side,I would have a close look at the airbag on extended height for leaks,spray with soapy water.

[V8Ian]

I fitted a secondhand compressor before going away for the weekend, it performed faultlessly. My intention was to order a recon kit from Bagpipingandy and fit that, keeping the s/h one as a spare.
I've always been amazed at people who claimed that the SLS provided an comfortable ride, to the degree that I've stated my D1 was a superior ride. The ride has been transformed with a different compressor. The car now sits level. Previously I thought the front springs had sagged, but now I believe that the valving was the issue. The original compressor is probably not worth reconditioning.

[pop058]

I fitted a secondhand compressor before going away for the weekend, it performed faultlessly. My intention was to order a recon kit from Bagpipingandy and fit that, keeping the s/h one as a spare.
I've always been amazed at people who claimed that the SLS provided an comfortable ride, to the degree that I've stated my D1 was a superior ride. The ride has been transformed with a different compressor. The car now sits level. Previously I thought the front springs had sagged, but now I believe that the valving was the issue. The original compressor is probably not worth reconditioning.

Don't throw it, I have got several in parts (somewhere ?). May be able to make a backup one out of all the bits.

[lewy]

have a look at my gallery at about page 5 to see how i converted an old compressor to use an external aftermarket compressor using all the original valves.works a treat.