Disco 3 (LR3) Exhaust valve!

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Grrrrrr

Grrrrrr

Technician, Bodgit & Scarper Ltd
Posts
19,810
Location
Buckinghamshire, UK. ('95 DT)
So, we managed to get Storey Wilson's software (4CAN) working on my mate's 2007 Disco LR3. The fault read was exhaust valve! Cleared the fault and managed to recreate it by going up and down. The fault occurred while trying to lower. On the live pressure readings we saw a spike in pressure after asking the car to lower, the fault occurred and then it lowered itself down. So, sticky exhaust valve?

Took the compressor assembly out and had a look at the exhaust valve. The date on it is from 2013 and the part number was from an LR4. So, someone's been in here before and not that many years ago, presumably the person who snapped the plastic mounting cover where the screw goes through! All parts looked very nice and clean and fairly new so that fits.

The exhaust valve seems to consist of a piston with a port above and below it. I am guessing a valve opens one way forcing the piston to cover 1 port and allow air to vent to the atmosphere from the bags (presumably driving out any moisture from the air-dryer on the way). In the other position the port to atmosphere seems to be blocked and the exit is via a large diameter pipe that presumably links the compressor (via the air-dryer) to the air reservoir tank. Inside the exhaust valve where the aluminium piston slides up and down there was a load of white grease, presumably to lubricate the piston. However, it seemed to be gumming the piston and ports up rather than helping. So, is that white grease normally there? Is there something else I am missing here?
 
One other thing. The compressor etc was AMK and clearly for a later model. The original would have been Hitachi. Could that cause issues or are the 2 interchangeable?
 
Can't really be of help with the valve etc, but I did read in an LRO article (March 2015) that the dealer replacement for the Hitachi compressor is the AMK made one, which also involves 'revised pipework, new casing and reprogramming of the system', so might have been a dealer repair.
 
Software stored in the cars ecu needs updating to tell it what make of pump it's using, if it hasn't already been done
 
hi

also check that the relay has been replaced to the correct one,

as mentioned check the software has been updated ,

the diagnostic reader should be able to tell u what compressor and software you've got

when u turn the engine off u should hear a hiss, proving the exhaust valve is clear

also things that are not checked is the inlet air filter, which is a round canister , is fitted in the passenger side boot side locker, has a foam filter inside , i removed mine, hoovered it out and replaced

can be much help with the amk, recently rebuilt all my air suspension, compressor etc but alas was with the dunlop replacement but always happy to help where i can

hope that may help abit

ps, shame ur not closer as i would have happily helped u with it, know i can plug my iid into other d3 and read codes etc , hope that doesn't come across as rude or telling u how to suck eggs, lol
 
Last edited:
Grrrrrr said:
For my reference as much as anything else ...

Relay sounds a bit unnecessary but here is the guidance:

http://lr3owners.com/gallery/albums...spension_Compressor_and_Relay_Replacement.pdf


Software upgrade guidance is a about as much use as tits on a Mars bar (to steal Wammer's phrase):

http://www.disco4.it/gallery/albums...Software_Update_When_Replacing_Compressor.pdf
Click to expand...


heard so much crossed feed back with this

when the compressor is replaced i was always told and informed that the correct relay according to the compressor has to be fitted

along with the correct software, als though not being a software engineer i don't know enough in what it changes or improves

how's things now with urs, what faults are still coming up etc ,

are u able to get the 3 x different suspension levels without fault

always happy to help where i can, as i've also had to replace most of mine have learnt a lot

seems the basic errors are, bad connectors , there are 3 x of them behind the passenger wheel arch, silica blocked and exhaust valve also blocked up

seems as though you've made some advancement with that, what is the current status of ur suspension plse
 
A lot of exhaust valve faults are caused by a hairline crack in the end cap of the compressor around the inlet and exhaust pipe work. Have heard people have remedied using expoxy resin/putty around cap to seal it
 
johnlad said:
A lot of exhaust valve faults are caused by a hairline crack in the end cap of the compressor around the inlet and exhaust pipe work. Have heard people have remedied using expoxy resin/putty around cap to seal it
Click to expand...

agree , also seen that where u can also buy a new dryer end cap, seeing all four wheels are air suspension there's so many components to resolve issues and finding that air leak or blockage

the joys of owning land rovers , lol
 
The suspension works fine, most of the time. Goes up, down whatever. However, every so often when you go to access level or occasionally when you hit a pothole it comes up with suspension fault, locked to normal ride height. Switch off and back on and it is back to normal. Go in with diagnostics and it says exhaust fault.

The upgrade from Hitachi to AMK seems to have been done reasonably well. All looks very new and no signs of damage. All connectors are clean as a whistle.

We've ordered a new relay on the assumption it is cheap and maybe the old one wasn't responsive enough. Maybe the new ones are faster?

I had a play with Storey's software again this evening (my mate has left the car with me so I can have a fiddle when I get spare moments) but couldn't see the software version the EAS is running. Maybe I missed it somewhere.

That's probably it for fiddling now till Friday night!
 
New relay made no difference. I think we're at the software stage but I cannot see the version in the Storey Wilson software.

So, next question: is there anyone near Bucks who has the kit to tell if the software has been updated other tyhan taking it to the main stealer? And could they update it if necessary? If need be my mate is willing to travel so if push comes to shove could @gstuart help with the flashy IID kit?
 
Grrrrrr said:
New relay made no difference. I think we're at the software stage but I cannot see the version in the Storey Wilson software.

So, next question: is there anyone near Bucks who has the kit to tell if the software has been updated other tyhan taking it to the main stealer? And could they update it if necessary? If need be my mate is willing to travel so if push comes to shove could @gstuart help with the flashy IID kit?
Click to expand...

hi mate

my iid will read and clear faults but can't do software updates on other land rovers , as it's locked to mine

am more than happy to plug it in to see what codes come up, it should also tell me what current software it has

hope it may help a little bit
 
gstuart said:
hi mate

my iid will read and clear faults but can't do software updates on other land rovers , as it's locked to mine

am more than happy to plug it in to see what codes come up, it should also tell me what current software it has

hope it may help a little bit
Click to expand...

OK, cheers. That makes a backup strategy then. I've had a look on the Landyzone International Rescue Map but no-one near me admits to having the correct kit. Guess these cars are becoming more and more complex. You need to be a computer scientist rather than a mechanic now. :)

So, IID cannot do it. 4Dcan cannot! That leaves Nanocom, I guess, although most owners seem to have gone down the IID route and I don't know if the Nanocom can do it. Doubt it but you never know.
 
Idd. can do it but only for the vehicle it was bought for. But I think for £60 you can unlock it for another vehicle.
It's worth paying gstuart to unlock his for your vehicle
 
johnlad said:
Idd. can do it but only for the vehicle it was bought for. But I think for £60 you can unlock it for another vehicle.
It's worth paying gstuart to unlock his for your vehicle
Click to expand...

Cheers. Good to know. Although by the time he's driven to Kent and back it is going to be a fair few quid in diesel anyway! Gives us a backup option.

There's a guy near here called Ian Prior (FW 4x4) who seems to have a good rep. Never seen him myself but a friend recommended him. Not sure he can do Disco 3 but we'll ring him and ask!
 
Grrrrrr said:
Cheers. Good to know. Although by the time he's driven to Kent and back it is going to be a fair few quid in diesel anyway! Gives us a backup option.

There's a guy near here called Ian Prior (FW 4x4) who seems to have a good rep. Never seen him myself but a friend recommended him. Not sure he can do Disco 3 but we'll ring him and ask!
Click to expand...
The problem with home diagnostic is most are only unlocked for 1 vin
 
Grrrrrr said:
Guess these cars are becoming more and more complex. You need to be a computer scientist rather than a mechanic now. :)

.
Click to expand...

Its all cars and the the trucks are now the same, its rare we get a proper mechanical breakdown, its always electrical unit failure or wiring knackered, both cause the truck to stop and 99 times out of a 100 cant be repaired at the roadside.
 
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