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Have you checked all air lines, are they all tight & have the orange O-rings on them, this includes the one that goes to the top of the solenoid on the air bag that you're having the problem with, Then you might want to inspect the air bags itself, for leaks and cracks. Don't forget to turnoff the air ride system, the button is in the trunk before you jack up the car. Finally, there is a way to check the system without any special tools, just a jump wire. Let me know if you like to know how to do so.
Unfortunately, it sounds like the air compressor for your air ride system is not working. But before you replace make sure that the height sensors haven't gone out which would bleed deflate the bags. SunCore Industries has about the best prices for the air compressor, dryer and air struts and bags.
Changing them is no picnic, but there is plenty of information at SunCore on step by step instructions to do it.
I have a 96 Mark VIII and have had to replace the rear bags and two height sensors and the air compressor so far, but when they work as designed they are a very smooth ride. A friend went with the replacement non-air ride and there is a big difference in how it rides.
There are several ways to fix this. On some of the Air ride models you can put in regular springs and replace the Air bags. To work with what you have, you need to diagnose the bad parts and then make your decisions.
Your Air ride has a diagnostic plug like the kind you hear about for the engine. You need to take it to a Body shop or Independent or even a Dealer and see what parts you car needs. Some Autozones and Oreillys might have this specialized scanner for the Air ride.
The Air pump can be obtained used at Salvage yards. So can the Suspension bags and any switches you need. Some yards are now giving 1 year free exchange warranties. Others are 30days to 90days. You will need a Repair shop who is willing to use Used parts. But you may not have a bad pump with the other problems you are having. You can even get rebuilt Air bags.
You can expect the pump to be slow if the air is being released as fast as the pump is putting it in. There is an electric switch in each corner of your car which can bleed off the air. You may only have 1 bad switch. This is why an accurate Diagnosis is important to saving you money.
If anyone has jacked up your car without turning off the Air ride, it is very easy to throw the switches out of adjustment. You may only need to adjust and not replace the switches. The adjustment procedure needs to be done on a surface like the body shops use. This would be a verified flat surface or a Frame machine. If you had one wheel sagging it would be pretty easy to work on the one side. But with your symptoms it could be anything.
About the only thing you can do is look under the car while it is running and listen for escaping air. It is not going to be easy with the engine and pump running.
Cracked or broken hose to them (Does the compressor turn on with the key on when you start it, or first key-on without starting?)
Make sure on the driver's side of the trunk the air ride isn't switched "OFF". Something could have bumped it (unlikely, since theres a cover over it)
Experienced problem after problem with my suspension on my 1990 LSC. Finally contacted "Strut Masters" online and replaced my entire system with a conversion for less than 400 and an afternoon. Installation was simple.