NeilF Posted March 17, 2017 Author Share Posted March 17, 2017 20 minutes ago, Snagger said: If it stays up for days but drops quickly in use, then I can't imagine it being the valve block. I can imagine perished air bags leaking as the flex while driving, but I think an electronic control issue commanding a lowering is more likely. This was the way I was thinking, but I have no idea how to approach this side of things Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted March 17, 2017 Share Posted March 17, 2017 Best use of time and money would be the soapy water in a spray bottle option Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted March 17, 2017 Share Posted March 17, 2017 simply mix up a strong solution of Fairy (or other proprietary brand) washing up liquid, in a small hand sprayer - like you mist your houseplants with. The get the system pumped up. Then work round the bags, air lines and sundry components with the soapy water spray , looking for bubbles Quote Link to comment Share on other sites More sharing options...
Snagger Posted March 17, 2017 Share Posted March 17, 2017 As Dave says, soapy water shows air leaks as bubbles. Rocking the car while you stay underneath (ideally on a 4-post lift, but on the ground use some blocks or stands to prevent the chassis lowering to a point that could harm you) will simulate driving, the rougher the better. I suspect the ride height sensors or their wiring, or a fault within the ECU. As both sides are behaving the same, I'd be looking for something with shared voltage feed or earth, affecting the ECU's interpretation of both height sensors. If the sensors have a live feed and earth via the ECU, then I'd look at that feed. I suspect the feed will be at a lower voltage and inside the ECU, but I'm sure you see the logic. 1 Quote Link to comment Share on other sites More sharing options...
NeilF Posted March 17, 2017 Author Share Posted March 17, 2017 1 hour ago, honitonhobbit said: simply mix up a strong solution of Fairy (or other proprietary brand) washing up liquid, in a small hand sprayer - like you mist your houseplants with. The get the system pumped up. Then work round the bags, air lines and sundry components with the soapy water spray , looking for bubbles Well, I owe you an apology for not heeding your advice sooner. I went back and sprayed with soapy water. Nothing. Then I jumped up and down on the back bumper and lo and behold! bubbles from one spring. So I'll buy a pair to replace both. Still not sure why both sides go down though? Quote Link to comment Share on other sites More sharing options...
Snagger Posted March 17, 2017 Share Posted March 17, 2017 Probably a similar leak on the other side that you can't see. Simplest solutions are usually right... Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted March 17, 2017 Share Posted March 17, 2017 I don't know it they are still about, but there was an aftermarket HD option for the airbags - just better made Quote Link to comment Share on other sites More sharing options...
cackshifter Posted March 19, 2017 Share Posted March 19, 2017 Re the sudden let down, I experienced a very similar problem with a friend's disco 2. It was I think the wiring to one of the sensors was faulty - the wires had been badly repaired following chassis welding damaging the left side. You can get kits to do it (the one we used was labelled disco 3) ; and the kit is basically a new plug on a length of wires with joining terminals. It seemed to affect both sides. Re the coil arguments, Microcat lists rear coil springs for 7 seat disco 2s (granted it may not have been type approved) , RKB000340/350, so they must be used somewhere. Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted March 20, 2017 Share Posted March 20, 2017 They are... Quote Link to comment Share on other sites More sharing options...
cackshifter Posted March 23, 2017 Share Posted March 23, 2017 Sorry, it was just meant as an observation Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted March 24, 2017 Share Posted March 24, 2017 Ok - my bad. Sorry Quote Link to comment Share on other sites More sharing options...
NeilF Posted March 30, 2017 Author Share Posted March 30, 2017 (edited) Well, I've had the new air bags in a week and not a sign of a sag. They inflated as good as gold, too. Thanks to all the contributors and just to re-iterate what the more knowledgable on here have said: even when you're sure it's not the bags, it's probably the bags.....:) Edited March 30, 2017 by NeilF 1 Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted March 31, 2017 Share Posted March 31, 2017 Something else will fail soon - such is the way of the D2 1 Quote Link to comment Share on other sites More sharing options...
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