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P38, New EAS troubles

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So I had the EAS all working nicely, and then it let me down after a few weeks , there were some slow leaks but nothing I thought the system couldn't cope with, for example if unused for a couple of days the height would drop an inch  or so.

After getting the engine running again yesterday I thought I would look at it and see if the trouble could be.

Dusted off the home-made cable and fired up the free software from RSWsolutions.com which has served well in the past and attempted to reset the system.

As of the present moment I have not succeeded  in sorting anything out. (It has been a rubbish day actually, although the engine runs I now have at least three leaking injectors which I didn't have before!)

But there is a question I would like to ask if anyone knows why..... on starting even when running OK before the last malfunction, it would dump  air from the rear before refilling and then finding level. This undoubtedly wastes air and increases the workload on the compressor and I would like to stop it if possible. At present it just dumps the air and doesn't refill anything.

Also (OK two questions) it has failed twice now while on the move, once shortly after I bought it and the most recent occurrence, why on Earth does it dump the remaining air in the system under failure conditions, that just makes the situation 10 times worse at 60 or 70 miles an hour!

I have the EAS relay swopped out already for a 4 pin standard relay as per threads on that subject.(ie I dont think the auto-levelling function is the cause of it)  Airbags are now 2 years old and should still be OK. I have tried to find and repair leaks and there isn't anything major. Valve block had all new seals, and the compressor was working well when I last tested it but after it's latest trials that may no longer be the case. I seem to get a different fault list everytime I reset, but I'll have another crack at it maybe tomorrow afternoon and see if I can get a consensus of likely faults.

As ever all suggestions welcomed

 

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You could have a leaking NRV, that will allow air to escape from the bags if the pressure in the tank is lower. Try running the compressor with the door open to build some pressure first, or better yet, fill the tank with a mains compressor (via the pipe to the top of the dryer).

It does make some sense for the system to try and level the car as soon as possible, because a level ride height will give better handling (and looks), provided there aren't any (big) leaks resulting in too low a ride height. If a hard fault occurs, getting the car on the bumpstops may not be the most comfortable option, but it is the safest. It will force the driver to slow down and avoid handling problems that could arise when one corner or one side is significantly lower than the other(s).

Filip

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Thanks Filip, on the NRV front I had two valve blocks and picked the best 3 from the 6 but the cones are marked on all of them although the seats seemed fine and the seals of course were new.  Has anyone sourced new NRV's I wonder?

Prior to trying it each time I have been charging the reservoir and setting all 4 corners at the standard height to save the compressor. If the storm isn't too bad tomorrow I might get a chance to tinker.

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Had a tinker with it this afternoon, found one pretty significant omission in the re-build, .......... forgot to put the spring back behind the diaphragm! sorted that and managed to reset the system. All good now except that the compressor is not pressuring up the system.  Probably it overheated the piston last time :unsure: They do seem to be very fragile the compressors.

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You can check the compressor via the blue line. If you get pressure there, put the shop compressor on the blue line to check for leaks and correct operation.

One step at a time, you'll get there. 😉

Filip

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Well, I checked on the compressor using my finger and reckoned it was down on pressure, not very scientific but as I had only recently tested it that way when I was reasonably confident it was working well,  it was good enough.

ordered new seal and cylinder kit which turned up yesterday and went straight in last night. (You get quicker at it!). Fitted up this morning and the system was immediately happy, I didn't even have to get the laptop out, very happy.

Since the last post, the leak situation has been much improved, the front has stayed 100% leak free in the interim, the back settled slightly but that is probably 50/60 litres diesel, I haven't had to add air to any corner.

The only leak I haven't been able to trace is a slow leak from the reservoir, in the 10 days or so it has gone from about 85psi down to 40, I am hoping the system can live with that kind of leak, fingers crossed.

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