Vehicle & Technical > Range Rover

Air surspension stopped working... and dont say "I told

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Jonny Boaterboy:
I have a problem with the air surspention on my 1994 Range Rover. I broke my leg about 8 weeks ago so the Range rover has been standing for a while. When I came to take it out out again the air surspension did not inflate it stayed on the bump stops. I took it down to my local land rover place they hooked it up and said that there was a falt and that it just needed reseting which they did, (£25) and it worked fine on the way home. I parked it up for the night and came to take it out the next day to find that it would not reinflate again. It self levels when you stop and take the key out and all the buttons and light seem to be working as normal. The only thing that seems a miss is that the compressor sounds noisey.

while it has been standing I have waxoiled it put an optima blue top on (so it had no battary on for about 3 days) and charged the new battary once fitted.

has any one got any ideas my only thought is that the compressor it on its last legs and not pumping out enough air.

Thanks alot

Jonny

Jonny Boaterboy:
Well a bit more infor for you..... I went out in him today and after driving around for about 10 mins it made it up to full hight. Geting out and watching it it would deflate the surspension quickley but then re inflate them really slowly with the commpresor working all the time. The compessor is making alot of noise just latley could it be that it is not giving out the volume of air qiuck enogh to inflate quickly or would it be a sticking solaniod that is not opening fully, or what about a faulty presure switch on the air tank that is not allowing the presure to get high enogh?

Any ideas

Thanks Jonny

andycwb:
It sounds like you have two problems.  The first is that the compressor isn't filling the system quickly enough, and the second is that their is an air leak.

Test #1: Undo the drain plug on the air reservoir until the air starts to escape, and let it empty.  With the engine running and a door open, time how long the compressor runs.  More than 10 mins to fill the reservoir means it's past it.  It should be 6 to 8 mins.  If you can hear air escaping from the valve block exhaust during this time you have diaphragm valve failure in the valve block.

Test #2: Shut the door, and let it come to height.  Switch the engine off, and open the door again.   Measure the height to the wheelarches on each corner, then come back in a couple of hours and measure them again.  That will tell you if you have a leak.

Hope that helps.

AndyC

P.S. This page on my site is almost entirely applicable to the classic as well.  The only differences are in terms of some of the wiring pin outs and component locations. http://www.cunningham.me.uk/rangiewiki/index.php?title=P38A_Suspension

Jonny Boaterboy:
Andy your a star! Will try that tommorow dont think that there is any leaks but will check anyway, but the compressor does sound "weak" If I take the drain plug out of the tank will it come out with a pop! and is this the easy way to depresurise the system as in the manuel it says to depresurise the system befor doing any work on it?

ariane44:
You wrote something about waxoiling the car - did you put anything between rear fender and rear inner wing? There is the air intake of the EAS (you can access it if you remove the subwoofer and the plate behind it). The intake also has a little filter that wants to be changed from time to time. I would check this first before making the compressor run for too long with the danger of overheating.

To find the leak you can use soapy water. If you disable the EAS (and automatic levelling) with the switch at the lower B-post underneath the passenger seat (right hand on LHD cars, where you also find the EAS ECU), you might see which edge lowers most to give you a start. In case you still have the original air bags they should be pretty porous in the area where they fold. Island4x4 have cheap replacement air bags which can be installed very easily.

What fault did they find? Height sensor out of range?

Cheers

Carsten ;-)

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