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P38 air suspension

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v8kenny:
Evening Chaps
I have recently bought a Jap import 4.6 HSE which I am generally very happy with
I have some questions re the air suspension though
When the motor has been sat for a while the suspension ends up right down - is this normal or is there maybe a leak in the system ? - has to sit for a few days for this to happen - no problems if used daily
Once the suspension has gone right down then it can take up to 5 minutes for it to pump up to normal ride height (light on eas display stops flashing) - surely it should pump up the system far quicker than this even when sat down
I wonder if the compressor is on its way out - I can steal (borrow) a known fully working comp. from my brother in law's P38 to see if this is any better - any issues with me disconnecting/connecting compressors ?
If it the compressor has anyone tried the repair kits on ebay (piston, barrel and teflon seal )that are supposed to refurb the comp.? - at about £85 a lot less than a new comp.
There are no fault messages showing and once suspension is up to speed  everything works fine  -  any suggestions please

thermidorthelobster:
Sounds like you have a leak, and your compressor is not A1.

Easiest way to check for leaks is to spray water with fairy liquid in around the join between the plastic and the rubber in each spring, and around the unions at the top.  Look for bubbles.  If you find some, then that's good, because it's better to repair/replace a spring than the valve block.  The o-rings in the unions and in the valve block sometimes fail, and these can be replaced.

If your P38 has ever got mucky, the compressor may have sucked in some crud;  check the filter in the rear quarter post behind the lights.  You might want to pop the compressor out and check it for obvious signs of wear as it's quite easy.  If you can try a different compressor then do so, it should be problem-free.

On mine I just replaced the compressor, so I can't really comment on the fixing kits.

AndyCWB's page at http://www.p38a.co.uk is a great resource for troubleshooting your truck.  I have the RAVE cd which includes detailed diagrams and explanations for all the air suspension bits (and the rest of it) if you need it.

v8kenny:
Thanks David
So if I try my brother in law's comp. I won't induce any fault codes on his motor ?
Will try a leak test first as this won't be doing the comp. any good working more than it should
When you disconnect the comp. does this purge all the air out of the system
and make it drop quickly to the bump stops ?

Xtremeteam:
changing the comp "shouldnt" flash any fault codes up,

ull be looking in the rear 1/4 for a while if ur after the compressor filter,the pump is situated on the LHS of the engine bay & the filter is on the front of the pump,remove the filter & housing from the pump & with it running stick ur finger over the end o the inlet,it should have a fair sook to it,if not the comp is on its way out,

Also if ur rangie has ever had a burst exhaust id bet that the pipes have been melted on the rear chassis rail,also they chaff through betwen the chassis & the body & are an absolute brstd to fix,
air bags... check to see if they are perished,if they are spray some soapy water on them to check for leaks,does it go down if parked at a slight angle?

like 2 wheels up the kirb?

if so its a high posibility of the airbags have a leak

v8kenny:
Cheers Mikee
Found the diagrams for removing comp / air springs on rave
When you pull the outlet pipe off the comp to remove it does the air escape here or is it just like taking an air tool from the hose with no leaks
I'll try your sook test (oo'er missus !) at the weekend
It seems to drop down offside rear first then offside front - nearside stays up fine
When system is back to normal it rides even with no lean
Everything seems to be pointing at a leaky airbag - ok to do just one or do they need done in pairs ?
If I have to replace them all AND the comp I might as well bin the lot and fit coil spring kit !

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