P38 4ltr 2002 thor 35mph EAS

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listerdiesel said:
As a relative newcomer to Rangie air suspension, I can understand Wammers' comment about when and why the system operates, as I've worked on truck air suspensions in my days as a Scania mechanic.

The height sensors tell the ECU about the attitude of the car, but there is a time delay between that signal coming in and the ECU directing air or releasing air to make a change.

The compressor is purely keeping the reservoir topped up as directed by a pressure switch, I don't see anything in the operating modes that enables the ECU to directly operate the compressor on its own.

My P38 is level and steady on its wheels, while we are working on it, it has not gone down at all, which is what we would expect.

Peter
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Correct, no adjustment is made whilst the vehicle is being driven. Other than the standard to motorway above 50 MPH for 30 seconds or the return to standard below 35 MPH for 30 seconds. The only time any valve should open is when the vehicle speed falls below 1 MPH then both front valves open to equalise pressure across the axle. That is why it is important to have the front bit count within 2 side to side.
 
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wammers said:
Correct, no adjustment is made whilst the vehicle is being driven. Other than the standard to motorway above 50 MPH for 30 seconds or the return to standard below 35 MPH for 30 seconds. The only time any valve should open is when the vehicle speed falls below 1 MPH then both front valves open to equalise pressure across the axle. That is why it is important to have the front bit count within 2 side to side.
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I will check my traces. I am sure the pump runs way more than just at height changes. You can hear it. It seems to do it more with low battery volts.

I can think of a reason why it might open a valve. As it goes around a bend it will shift its centre of gravity and start to lean. The sensor will change and the car will try to level, either pumping air into the low side or letting air out of the high side. This will keep the car reasonably level. Certainly it seems to wallow more if you have driven using the emergency inflation kit. If ever it opens a valve it tops up the reservoir.
 
Grrrrrr said:
I will check my traces. I am sure the pump runs way more than just at height changes. You can hear it. It seems to do it more with low battery volts.

I can think of a reason why it might open a valve. As it goes around a bend it will shift its centre of gravity and start to lean. The sensor will change and the car will try to level, either pumping air into the low side or letting air out of the high side. This will keep the car reasonably level. Certainly it seems to wallow more if you have driven using the emergency inflation kit. If ever it opens a valve it tops up the reservoir.
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In the words of a legend. "You cannot be serious"
 
Stand easy, men. This time, I (you) have definitely cracked it. Honestly. Someone posted weeks ago that an exhaust blow might have shot at the airlines over the chassis rail. As time went on I replumbed the rear nearside which helped the list to port. I should have clocked it then. What kidded me was I got no bubbles with the engine stopped or not. I worked it out, thanks to the landyzone troups, true and many, in my remaining unlabotomised brain cell that the compressed air receiver or line must be up the chute. The tanks OK but I renewed the airline over the chassis rail and joined to my previous replumbing. Voila. Pump redundant, sulking. To be on the safe side I replumbed the remainder.i think someone was a bit over zealous with a blow torch. I needed major surgery to part company with lambdas someone had stuck in with liquid metal.matron says you'll all get your reward in heaven. I've had syrup on my porridge this morning instead of salt for being a good fellow. I'm off to find my first L322 now to share the good news with him. He MUST be in here somewhere. Thank you all so much.
 
The penny just hasn't dropped yet with the pulling of the delay timer technique.im failing to see the logic altogether. I'll do a bit more homework in fairness and in view of the effort everyone's put in.i doubt this is goodbye for ever, somehow.
 
supapete said:
The penny just hasn't dropped yet with the pulling of the delay timer technique.im failing to see the logic altogether. I'll do a bit more homework in fairness and in view of the effort everyone's put in.i doubt this is goodbye for ever, somehow.
Click to expand...

It just eliminates a lot of variables at once. Put her on high, open a door and switch off. Pull the delay timer. If a corner goes down the leak is more than likely on that bag / line. If all 4 go down it is unlikely to be all 4 bags gone (unless they're all very old) so you need the check the valve block.
 
Grrrrrr said:
I will check my traces. I am sure the pump runs way more than just at height changes. You can hear it. It seems to do it more with low battery volts.

I can think of a reason why it might open a valve. As it goes around a bend it will shift its centre of gravity and start to lean. The sensor will change and the car will try to level, either pumping air into the low side or letting air out of the high side. This will keep the car reasonably level. Certainly it seems to wallow more if you have driven using the emergency inflation kit. If ever it opens a valve it tops up the reservoir.
Click to expand...

In a 644 data point trace at the same height setting I caught 10 instances of topping a bag up, almost always the front. It doesn't do it a lot but it does do it.
 
It was my pump! All the faults we're there ie. Damaged airlines which caused the pump to go west. Riding on the bump stops for 500 miles which wiped the bags out. I put a new pump on and got back but, with ongoing Faults. I did the 1750 miles with the pump running non stop virtually. All the faults blinded me to what you will all be screaming were the basics. I've overhauled my original pump which hasn't run since I put it on. I had to fire it up with (dare I mention the war) my Hawkeye to make sure it worked. I've ate humble pie all over the forum now. You chaps can now take a well earned rest. Goodbye but not forever. Very best regards. Peter.
 
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