P38 diesel air suspension

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gymboy

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hi there looking for some help with a 1999 p38 diesel ,the suspension wont pump up there are no warning lights on the dash,the compressor is running constantly which by the way is nearly new,i have checked for leaks on all air lines visualy and cant see or hear anything ,i have also filled each line with compressed air and every air bag goes up with no probs and cant see any leaks when up any help would be great thanks wayne.
 
gymboy said:
hi there looking for some help with a 1999 p38 diesel ,the suspension wont pump up there are no warning lights on the dash,the compressor is running constantly which by the way is nearly new,i have checked for leaks on all air lines visualy and cant see or hear anything ,i have also filled each line with compressed air and every air bag goes up with no probs and cant see any leaks when up any help would be great thanks wayne.
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With compressor running remove exhaust valve put your finger over opening, if there is air comming out of of it the diaphragm is split. If there is no pressure the suspension cannot lift.
 
my guess is the valve block, if the airlines are working and can be pumped manualy than it sounds like the valve block. as a last try i would leave the engine running and open eith a door or the boot and let the air cylinder refill then close it after 10-15 mins and it might rise up, if not then i would defo be on to ebay looking for a new valve block.
 
gymboy said:
hi there looking for some help with a 1999 p38 diesel ,the suspension wont pump up there are no warning lights on the dash,the compressor is running constantly which by the way is nearly new,i have checked for leaks on all air lines visualy and cant see or hear anything ,i have also filled each line with compressed air and every air bag goes up with no probs and cant see any leaks when up any help would be great thanks wayne.
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What are the various height level leds doing.Are they all illuminated or is the actual level illuminated and the requested level flashing.
 
Either the compressor is NBG, or the inlet filter is blocked, or you have a major leak, or as you have no lights on the level indicator and no "Slow 35mph" on the screen maybe you have a driver pack or ECU problem. No way of knowing what is actually going on until you read the fault codes.
 
high actual level light is lit and requested is flashing,no faults codes showing in ecu ,inlet filer a ok and compressor is a1 checked air pressure from it showing fine
 
gymboy said:
high actual level light is lit and requested is flashing,no faults codes showing in ecu ,inlet filer a ok and compressor is a1 checked air pressure from it showing fine
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You have no air pressure. Take intake filter off put your finger over it, with pump running there should be suction, if there is take blue pipe off pump put your finger over outlet air should be forced past it. If not pump is duff and will need looking at. If there is pressure remove exhaust filter put finger over outlet, with pump running if air is coming out diaphragm is split and will need changing. You must make sure you have air pressure before trying anything else. The air is going somewhere and it's obviously not the tank.
 
hi all right took out exhaust with comp running and heypresto air is pumping out so looks like the diagphram nxt question is where is it and how to change it thanks to u all wayne
 
gymboy said:
hi all right took out exhaust with comp running and heypresto air is pumping out so looks like the diagphram nxt question is where is it and how to change it thanks to u all wayne
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You will have to remove the valve block. Take off the block that the blue pipe goes into. Four allen bolts. Under that you will see diaphragm, a spring and an O ring. Look for a split or debris holding it open.
 
right its off no splits in o rings or debris but diagphram looks like its broken in some way as its just moving up and down when shaken
 
gymboy said:
right its off no splits in o rings or debris but diagphram looks like its broken in some way as its just moving up and down when shaken
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It's a split in the diaphragm your looking for it has to seal against exhaust port, pushed onto it by the spring. Take it out and examine it.
 
hi just driving p38 and down on stops alarm sounded mesage on dash 35mph and all lights on the switch up n down any sugestions what i can do before i take to garage ??
its a deisel r reg
 
nick22 said:
hi just driving p38 and down on stops alarm sounded mesage on dash 35mph and all lights on the switch up n down any sugestions what i can do before i take to garage ??
its a deisel r reg
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Yep, free EAS software, low cost cable I can supply and with the aid of a laptop you can read and clear the fault.
If you read the faults and come back to us we can probably tell you what needs fixing.:)
Garage will cost you an arm and a leg, most don't understand the system and often suggest putting it on coils, a very bad idea and more expensive than a fix.
Where are you located? There may be someone nearby with diagnostics.
 
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