Air suspension problem, I know not that again

[captiva]

Originally Posted by Ricky Bobby

Your accumulator 74 code dictates an air compressor (pump) burnt out of spec. Did you actually replace the whole pump? Explain this overhaul you did? Did you use the seal repair kit available to refurbish the pump, or did you just buy a used pump and swap them out?

Did you reset the faults in the module with GT1/DIS/INPA after "overhauling the pump"? If you didn't, your old faults will be stored and you'll still have an error on the dash.


Explain these questions and I should be able to help you figure it out, I swear I should make a sticky thread about repairing the air suspension, I must get pm's once a week about it ever since mine was fixed.

I got the piston ring and seal from England and fitted that and there was an improvement so went on to buy replacement pump from Arnott and although the light has not come on YET pump goes crazy when I try to select high level. Have a DIS 44 so cleared any codes

[captiva]

Originally Posted by Ricky Bobby

This is the key statement which tells me your air pump, whether replaced with a new one or not, still has issues. When I replaced mine a year and a half ago, I bought a used pump off a member on here which came off a 30k mile X, so it was fairly new. however, I would not recommend a highly used air pump because the seal does have a tendency to degrade and that is why it can't fill the bags quick enough.

Here is a link to the air pump repair kit that you need to install on your air pump to hold the pressure better, it comes from jolly ol' England:

Mercedes E Class s Class Wabco Air Suspension Compressor Pump Seal Repair Kit | eBay

Install it on your pump, reinstall in the car, and reset the faults. Your air suspension should be fine after that (with any issues relating to the above)

That is the exact repair kit that I fitted before buying the new pump

[Ricky Bobby]

OK so you refurbished one pump, and bought a new Wabco from Arnott as well? The Arnott pump is fitted now, yes? And there is still "self level susp inact" on the dash, ride height LED is not working?

Or does the ride height control work fine it just makes the "pump go crazy" when trying to go to offroad height?

FWIW, if I try to raise the vehicle via the switch you can visibly hear the pump working and it does take quite a few to get up there. The ride height changes are not quick either when lowering or raising, but definitely longer time to take to raise the vehicle in my experience.

Since you have DIS, have you run a ride height re-calibration lately?

[captiva]

Originally Posted by Ricky Bobby

OK so you refurbished one pump, and bought a new Wabco from Arnott as well? The Arnott pump is fitted now, yes? And there is still "self level susp inact" on the dash, ride height LED is not working?

Or does the ride height control work fine it just makes the "pump go crazy" when trying to go to offroad height?

FWIW, if I try to raise the vehicle via the switch you can visibly hear the pump working and it does take quite a few to get up there. The ride height changes are not quick either when lowering or raising, but definitely longer time to take to raise the vehicle in my experience.

Since you have DIS, have you run a ride height re-calibration lately?

That is correct , I fitted the new pump as I thought I was on the right track with the repair kit on the old pump improving things but not curing problem . Inact susp light has not come on yet but repaired pump went a few days without light coming on then came on again when weather was below zero as this seems to be a common thing. Ride height LED works but the vehicle gains a little height but not fully, when moving button from normal to off road pump is going all the time. Have done many ride height calibrations but not one since repairing old pump or fitting new Arnott pump.

As a side note do you know if the rear ride height sensors should be at an angle unlike the front ones which are dead level. Wondering if this has any bearing on problem as they may be reporting wrong info to module/DME

[Ricky Bobby]

You have new bags on all four corners?

Is it possible the ride height links are possibly frozen and/or swapped? Although if you had a problem with the sensor linkage you almost certainly would have the error glaring at you intermittently.

I would plug in to DIS and see what errors you have thrown since installing the new pump, if any. My only intermittent error I had since replacing my pump, was due to a ride height deviation error (one corner was 1/2" higher than the other corner, the system gives a deviation allowment of I believe 3/8")

[bcredliner]

Originally Posted by captiva

That is correct , I fitted the new pump as I thought I was on the right track with the repair kit on the old pump improving things but not curing problem . Inact susp light has not come on yet but repaired pump went a few days without light coming on then came on again when weather was below zero as this seems to be a common thing. Ride height LED works but the vehicle gains a little height but not fully, when moving button from normal to off road pump is going all the time. Have done many ride height calibrations but not one since repairing old pump or fitting new Arnott pump.

As a side note do you know if the rear ride height sensors should be at an angle unlike the front ones which are dead level. Wondering if this has any bearing on problem as they may be reporting wrong info to module/DME

The angle of the ride height sensors depends on the calibration. Therefore, the angle of the front and rear arms can differ. Regardless of the height setting the sensor arms should be toward the outside of the vehicle. If a sensor arm is reversed which can happen when the X is let down from a hoist or jack, the air suspension light will come on within a few miles of driving. When the light comes on because of a reversed sensor arm it will not go off until the arm is in the correct position and it may take a few miles of driving before the light goes out.

Not sure my understanding is correct but it sounds like the light is intermittent, if so, it is not a reversed sensor arm though I would take a peek anyway.

[captiva]

Originally Posted by Ricky Bobby

You have new bags on all four corners?

Is it possible the ride height links are possibly frozen and/or swapped? Although if you had a problem with the sensor linkage you almost certainly would have the error glaring at you intermittently.

I would plug in to DIS and see what errors you have thrown since installing the new pump, if any. My only intermittent error I had since replacing my pump, was due to a ride height deviation error (one corner was 1/2" higher than the other corner, the system gives a deviation allowment of I believe 3/8")

No just fronts but have thoroughly tested rears and are in good shape.I should have explained myself better, when I was asking about the rear sensors I mean the fitment of the black square box to the frame , the sensor itself, not the arm I understand they should be level and pointing to the outside of the car.

[captiva]

Originally Posted by bcredliner

The angle of the ride height sensors depends on the calibration. Therefore, the angle of the front and rear arms can differ. Regardless of the height setting the sensor arms should be toward the outside of the vehicle. If a sensor arm is reversed which can happen when the X is let down from a hoist or jack, the air suspension light will come on within a few miles of driving. When the light comes on because of a reversed sensor arm it will not go off until the arm is in the correct position and it may take a few miles of driving before the light goes out.

Not sure my understanding is correct but it sounds like the light is intermittent, if so, it is not a reversed sensor arm though I would take a peek anyway.

I should have explained myself better, when I was asking about the rear sensors I mean the fitment of the black square box to the frame , the sensor itself, not the arm I understand they should be level and pointing to the outside of the car.

[xRide]

Im having the same issue as yours.

I read somewhere that these things happen when the weather gets to be very cold.

Im not sure what my problem is. I cant hear the pump from the cabin. Ive only done the front bags.

I cleared the code the first time and it came back few days after. I cleared it again on I think friday so im waiting to see what happen.

Today I noticed one side of my reear was about 1/2 inch higher than the other. Lowered the truck and raised it back to normal and it was 1/4 inch off.

i dont know right now. all I know is im getting headaches from this truck that i got in june with 57k miles.

[xRide]

Is this the "repair kit" ya'll use?