Thread: Crazy EAS bypass issue

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When the EAS is working normally, the airbags (air springs) are mostly in the normal position.
This means the point where the airbags fold is the most stressed point, which over time can cause leaks while the bags are in that position.
The leaks can stop when used in off road, access, or highway heights, as the fold has moved due to the different heights and the leaks are effectively sealed up.
I'm guessing as you are manually inflating the EAS, the heights might be slightly different each time, so sometimes the leaks are there, other times not.
So you are not going crazy, I think this is most likely what is happening.
So the solution is probably new air bags, which should solve that issue.

Leaks can be hard to track down, but you are on the right track with the soapy water.
Another hard to spot leak point can be the diaphragm in the valve block, if you spray the EAS exhaust silencer with soapy water and see bubbles, that would point to a leaky diaphragm.

Hope that is of some help!

Yours is the most sensible analysis imaginable!

The air springs are currently at maximum height and are not losing air at all. Because I live in the bush, I'm inclined to leave them that way and see what occurs when I take the vehicle for a drive.

The PO did supply a spare set of used air springs and I'll try to test them to see if they hold air. If so, it will be worth changing whichever current unit is leaking

Thanks again

Alan

Hi Alen,

Are you saying there are 4 schrader valves, one for each corner?

Is the rest of the system, valve blocks, compressor and the like isolated from the air springs?

If so the for all 4 corners to drop it must be leaking at all 4 corners.

If all the original system and plumbing is in place, the the leak could be anywhere, but if all 4 corners are dropping I would guess the central valve block.

That said I'm only guessing, I've never had anything to do with a air sprung car, what I understand is from reading people's posts on mostly D 3/4s

Tony

Originally Posted by TonyC

Hi Alen,

Are you saying there are 4 schrader valves, one for each corner?

Is the rest of the system, valve blocks, compressor and the like isolated from the air springs?

If so the for all 4 corners to drop it must be leaking at all 4 corners.

If all the original system and plumbing is in place, the the leak could be anywhere, but if all 4 corners are dropping I would guess the central valve block.

That said I'm only guessing, I've never had anything to do with a air sprung car, what I understand is from reading people's posts on mostly D 3/4s

Tony

The original syatem is still installed but bypassed by the additional lines and fill system so the original valve block seals are not the cause of the problem. There are four separate schraeder valves, one for each corner. They seem to operate independently altough there may be a interconnection I cannot see.

One corner seems to drop first so it is likely to be a defective airspring - see the recent post explaining how this occurs inermittently at at varying heights. Having read that explanation, I am now convinced that is the cause of the problem and the only solution will be to change at least one air spring, but probably all of them

Another thing worth considering would be the self leveling function of the EAS.
If one spring is dropping, the vehicle will self level overnight and deflate the other springs, which would cause all 4 corners to drop.

If you swap the EAS relay under the passenger seat with a yellow relay, this will prevent the self leveling function from working.
The EAS will still work normally, just no self leveling, so if you leave it like that overnight, you will be able to determine if it is just the one spring dropping, as that corner will drop, but the others should stay as they are.

I usually have a yellow relay in my EAS to stop it dropping overnight, (also to put less load on the compressor), but you have to remember, in order to do any diagnostics on the EAS you will need to change the relays back over.
You might find it is just one spring dropping, it should be pretty obvious which one it is, sounds like you already know which one, but this will be a definite way to know for sure.

Hope that is of some help!

Thanks again, Peter

I'll teke your advice and try the relay swap because it should help to identify which air spring is the culprit

Haven't driven the vehicle recenty and the suspension is still sitting at the high position.

If your system is bypassed you’ll be wasting your time.
You said each bag is inflated individually so only the bag or associated line can influence that corner.
I created a pressure check system with a t piece and pressure gauge that you can connect to any bag or tank to be 100% clear if it is leaking from that section to front near valve block. Simple & effective.
With eas system working it eliminates any of those parts then you can focus on valve block or sensors.

Here is pic when testing air tank.