I recently overhauled the system with:

New airbags on all corners.
New compressor (genuine part)
Valve block o-rings

The system isn't quite working as it should as it is losing air somewhere during the night. I have used a soap solution to spray all the airline connections and can't see anything.

When I "re-conditioned" the valve block there where 3 small mechanical valves that seem to be made of brass, they have a conical end that fits into a hole, the y are spring loaded and I am guessing that they are some kind of non-return valve.

These little valve where quite worn so could be the culprit I guess.

Does anyone know if these could cause that problem, and where I could get some replacements from?

Leave the tailgate open or remove the EAS relay under the passenger seat and see if it still drops overnight. If it does, it's not the valve block. In any case I can't see it being the NRV's as there is a valve for each corner and they would all have to be leaking.
Most likely pipe connections at the bags or the block. The EAS self levels every 6 hours when parked, so a small leak on one corner will cause it to level down.
Do you have diagnostics?

A leak on NRV 1 can cause tank pressure to drop overnight. But not a suspension drop unless you are losing tank pressure and NRV 2 is duff. NRV 1 holds pressure within the air tank. NRV 2 prevents air from the airbags escaping into an empty air tank when inlet valve opens. It basically allows high pressure air in one direction only into the the system from the tank but not back out. NRV 3 allows exhausted air to pass into the gallery for exhaust to atmosphere. It also prevents high pressure air when the tank is being charged from flowing into the system. As the same gallery is used to fill the tank when compressor is running that is used to exhaust air from the system. Opened and closing for filling or exhausting controlled by diaphragm valve. The suspension can only rise when compressor is running it cannot drop, unless NRV 2 is duff and there is more pressure in the bags than in the tank, when solenoid valves and inlet valve open on initial start up, to raise car, if there has been normal air loss overnight, due maybe to a slight leak or auto leveling.


PS. You didn't use red O rings by any chance did you?

Datatek, I have some software and a cable that allows re-calibration of the EAS, it doesn't really have diagnostic facility as far as I can see. I also have a Hawkeye but that doesn't appear to do diagnostic either? Can you suggest a better software system?

Wammers, no red 'O' rings, all black. just a thought, it is going down at the back and I'm guessing that the reservoir is emptying too as the system comes up slowly, but a lot faster than it did with the old compressor.

merlinpjl said:

Datatek, I have some software and a cable that allows re-calibration of the EAS, it doesn't really have diagnostic facility as far as I can see. I also have a Hawkeye but that doesn't appear to do diagnostic either? Can you suggest a better software system?

Click to expand...

If your software allows re-calibration it should also read the faults? Is it from RSW solutions? If not download the free EAS software from www.rswsolutions.com

merlinpjl said:

Wammers, no red 'O' rings, all black. just a thought, it is going down at the back and I'm guessing that the reservoir is emptying too as the system comes up slowly, but a lot faster than it did with the old compressor.

Click to expand...

If just the back goes down I would still suspect a leak, have you checked the airlines for leaks and the engine exhaust for blows?

Engine exhaust for blows???

Datatek, yes it is the RSW one, I'll hook it up in the morning and see if there are any faults.

merlinpjl said:

Engine exhaust for blows???

Click to expand...

A pin hole in the exhaust in the wrong place will melt the airlines which often seems to show up as a very small air leak dropping the rear.