Disco 3 (LR3) Disco 3 was fault diagnosis

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vilguy

vilguy

Do'er of stuff and the like
Posts
9,915
Location
Dumfrieshire
Hey guys, long time no see.

I've just bought one of these fancy gap iid tools and wow what a machine. I'm trying to diagnose a fault with the eas.

It's always been cack lifting up the front and now it's getting worse, it's constantly in fault. I've got the iid on it and got it in test mode, if I try and lift the dodgy corner it actually drops rather than go up? It'll recover itself after a while when out of test mode.

Does this sound like s dodgy valve bock?

Ive got a new compressor to go on first, as it looks like the original (with 200k on it). I've checked the air bag and cant find any leaks on it. Driving along it will lift, then put the red eas light on, drop, ping, light goes out, 2 minutes.... repeats itself. After a while it overheats and refuses to lift for a while until it cools down.

I'm at the "fix it with petrol and lighter" stage
 
Last edited:
vilguy said:
Hey guys, long time no see.

I've just bought one of these fancy gap iid tools and wow what a machine. I'm trying to diagnose a fault with the eas.

It's always been cack lifting up the front and now it's getting worse, it's constantly in fault. I've got the iid on it and got it in test mode, if I try and lift the dodgy corner it actually drops rather than go up? It'll recover itself after a while when out of test mode.

Does this sound like s dodgy valve bock?

Ive got a new compressor to go on first, as it looks like the original (with 200k on it). I've checked the air bag and cant find any leaks on it. Driving along it will lift, then put the red eas light on, drop, ping, light goes out, 2 minutes.... repeats itself. After a while it overheats and refuses to lift for a while until it cools down.

I'm at the "fix it with petrol and lighter" stage
Click to expand...

Hi mate

Great to see u back posting , along with hope all is well

Also have an iid and indeed they are a great bit of kit ,u can test to see how much pressure ur existing compressor is producing

Enclosed a chart for u of pressures , but does sound like ur compressor is knackered unless there’s a leak

Need to ensure there’s no leaks , if ur able to raise the height , then pull fuse F26 see if it drops over night

There’s a few of us now with iid so plenty to always help

Ref the valve and it dropping that’s more than likely the compressor not having enough guts to pump it back up straight away

Are u replacing like for like with the compressor

What year is ur D3 please and any pics

Thks

A736AF06-6742-48D2-83B4-60E3B9C89809.png
 
I would say if its raising then dropping then the front valve block is at fault, I think they just need stripping/cleaning/regreasing again, think in front of drivers side inner wheel arch.

Are you getting height readings from the duff corner?
Is the height sensor connected?
Is the arm in the same orientation as the other side?
 
Cheers guys,

Yeah the height readings are sound, no spurious signals coming from that and it does seem quite linear in its readings as it drops.
All the other corners lift and drop on command of the test sequence, but that front drivers one just collapses. It used to raise ok, but now its being a sod. So its not that the arm is wrong etc.

I think you could be right and it could be the valve block. I will try and have a look at it this weekend. I will probably fit this compressor (its a like for like) as, well I have it... and its always been a little slow to respond to height changes. Seems to run for a long time as well so I suspect its partially buggered.

Ill give it a crack

cheers guys

Paul
 
vilguy said:
Cheers guys,

Yeah the height readings are sound, no spurious signals coming from that and it does seem quite linear in its readings as it drops.
All the other corners lift and drop on command of the test sequence, but that front drivers one just collapses. It used to raise ok, but now its being a sod. So its not that the arm is wrong etc.

I think you could be right and it could be the valve block. I will try and have a look at it this weekend. I will probably fit this compressor (its a like for like) as, well I have it... and its always been a little slow to respond to height changes. Seems to run for a long time as well so I suspect its partially buggered.

Ill give it a crack

cheers guys

Paul
Click to expand...


Dont forget axle stands, I know you most likely know but they are proper scary when they come down, I may have gotten pinned by the rear x member once, allegedly!
 
aye ill get that sorted.

ive ordered a replacement valve block, don't want to be messing around cleaning it only to find its not quite right still. Should arrive in the next few days.

Ive now cycled the system a few times using the ID tool but then it couldn't seem to clear some codes out, I then plugged the hawkeye in which managed to clear them.

The bloody thing is only working a treat now! However, I suspect this is lulling me into a false sense of security so will still change the valve block and compressor still. Obviously there was something wrong. Weird that the id tool couldn't clear the fault but the hawkeye could. I was going to sell the hawkeye but im thinking I should hold onto it now.

Got to get the handbrake "fixed" this weekend. Weve been without it for the past year. We bought the car last year with a brand new mot on it, The handbrake had been disabled and when touched made a right ol' noise. I figured it just wanted setting up.
Turns out the previous owner had removed the brake shoes!! which I only discovered after I changed the discs on the back. MOT's... not worth anything really are they.

And finally the turbo actuator is sticking...… bugger.
 
vilguy said:
aye ill get that sorted.

ive ordered a replacement valve block, don't want to be messing around cleaning it only to find its not quite right still. Should arrive in the next few days.

Ive now cycled the system a few times using the ID tool but then it couldn't seem to clear some codes out, I then plugged the hawkeye in which managed to clear them.

The bloody thing is only working a treat now! However, I suspect this is lulling me into a false sense of security so will still change the valve block and compressor still. Obviously there was something wrong. Weird that the id tool couldn't clear the fault but the hawkeye could. I was going to sell the hawkeye but im thinking I should hold onto it now.

Got to get the handbrake "fixed" this weekend. Weve been without it for the past year. We bought the car last year with a brand new mot on it, The handbrake had been disabled and when touched made a right ol' noise. I figured it just wanted setting up.
Turns out the previous owner had removed the brake shoes!! which I only discovered after I changed the discs on the back. MOT's... not worth anything really are they.

And finally the turbo actuator is sticking...… bugger.
Click to expand...


Bet the tester never saw it, also bet the tester wouldnt be happy kowing the guy sold it on with a full ticket!

Maybe the IID would not clear the codes as it could still see a fault whereas the hawkeye could not see any faults?
 
vilguy said:
Turns out the previous owner had removed the brake shoes!! which I only discovered after I changed the discs on the back. MOT's... not worth anything really are they.
Click to expand...
I'd pass that information on to VOSA.
lynall said:
Maybe the IID would not clear the codes as it could still see a fault whereas the hawkeye could not see any faults?
Click to expand...
That's what I'd summarise too.
 
Irishrover said:
Having had EAS baptism on a P38, I found that the main problem appears to be poor delivery from the compressor due to wear on the piston seal,
There are service/overhaul kits on Ebay for the compressor and Dryer which are very good and restore it to as new.
Did the Disco 3 last year and it's been fine.
This the guy that has been around for years
https://www.ebay.co.uk/itm/Dunlop-Air-Suspension-Air-Compressor-Master-Repair-kit-Discovery-3-4
Click to expand...

I think the piston rings are ok, as the rear pumps up just fine, it's always been the front playing silly buggers.

The dryer seems a common issue and seems logical. It's done enough miles to warrant replacement of both those and the valve block to be fair. It's just easier to do it all than faffing around with individual bits n bobs
 
vilguy said:
I think the piston rings are ok, as the rear pumps up just fine, it's always been the front playing silly buggers.

The dryer seems a common issue and seems logical. It's done enough miles to warrant replacement of both those and the valve block to be fair. It's just easier to do it all than faffing around with individual bits n bobs
Click to expand...

Hi

If I may add please as you’ve got the iid, have u checked ur compressors output plse

U can also select ur valve blocks and when u press the up or down switch u should see them opening in the way of %

I’ve enclosed an old screen that i done before I realised my compressor was shot

When u watch the front valve block ur see if it opens 100% if it does nothing that would be a wiring issue , very handy way or proving if the valve block is at fault or not

Having a look on ur iid will at least tell u what the output is

Another thing is if ur incandescent has turned to dust it gets in everywhere , basically blocking up the valve blocks , u would see a white dust inside

If u find there full of white dust ur really need to then disconnect ur lines and blow all the lines out

I ended up virtually rebuilding my air suspension because it was in such a mess

Front valve block is tucked up behind ur drivers side wheel liner

Here’s also some pdf files

https://www.disco3.co.uk/gallery/al...s_and_Testing_Vehicle_Dynamic_Suspension_.pdf

http://media.disco3.co.uk/gallery/a...ver factory D3 air suspension description.pdf


Hope that helps



4EBCEE77-A773-4187-8BCF-B5B5C9CF4E95.png
67ACDE97-CCA0-4E03-B4C5-10B962965DEE.jpeg
FAA96476-873F-4D68-A05C-8CE415A892E3.jpeg
 
gstuart said:
Hi

If I may add please as you’ve got the iid, have u checked ur compressors output plse

U can also select ur valve blocks and when u press the up or down switch u should see them opening in the way of %

I’ve enclosed an old screen that i done before I realised my compressor was shot

When u watch the front valve block ur see if it opens 100% if it does nothing that would be a wiring issue , very handy way or proving if the valve block is at fault or not

Having a look on ur iid will at least tell u what the output is

Another thing is if ur incandescent has turned to dust it gets in everywhere , basically blocking up the valve blocks , u would see a white dust inside

If u find there full of white dust ur really need to then disconnect ur lines and blow all the lines out

I ended up virtually rebuilding my air suspension because it was in such a mess

Front valve block is tucked up behind ur drivers side wheel liner

Here’s also some pdf files

https://www.disco3.co.uk/gallery/al...s_and_Testing_Vehicle_Dynamic_Suspension_.pdf

http://media.disco3.co.uk/gallery/albums/userpics/15405/Land Rover factory D3 air suspension description.pdf


Hope that helps



View attachment 186150 View attachment 186151 View attachment 186152
Click to expand...


Is that a black handled snap on ratchet screw driver I see on the floor?
 
gstuart said:
Blimey you’ve got a sharp eye, indeed it is, had it for years and still works fine from the day I got it
Click to expand...


Sad tool fetish of mine, ive been told Ive got a disease!
Ive got an orange one in its case with loads of bits that I must have had for 30yrs, very rarely gets used these days.
 
lynall said:
Sad tool fetish of mine, ive been told Ive got a disease!
Ive got an orange one in its case with loads of bits that I must have had for 30yrs, very rarely gets used these days.
Click to expand...

Lol, ur not alone , am also terrible regarding tools, still have the bits in the handle

Someone gave it to me , must be a good 15 x years ago , also bought some bits to put 3/8 or 1/4 inch sockets on the end that fits into the screwdriver

At boot fairs the tool stands are like a giant magnet for me, perfect for getting little spanner’s or tools, alas just convince myself they will come in handy for that one special job, 3 x years later u struggle with a job then find those tools u bought years ago, doh
 
You know you have a problem when you have one of these and its crammed with no spare space and I need a bigger box but am to tight to spend the money!
Its a KRA and I want the KRL but people want way to much for old tool boxes so will just wait as one will come along.

Screen Shot 2019-08-07 at 11.31.54.png
 
Ha yeah the lines were full of failed dessicated coconut. A big hug of it shot out of one of the lines as I released them (I couldn't be bothered to release the pressure first)

Blown out, valve replaced and it shot up a hell of a lot faster.

I'll change the compressor tomorrow.
 
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