Air-spring suspension 1995 Mark Vlll Lincoln Continental.When car is turned off fornt air-springs stay inflated but sometimes rear air-springs slowly lose air but inflate after ignition switch is turned to on or started. System check indicates air-ride system is ok.

AIR COMPRESSOR TO AIR RIDE IS POWERED DOWN.

Or for under $400 you can buy a coil spring conversion kit from a company like
Arnott. Look for coil spring conversion kit exclusively designed for the Lincoln Mark VIII. The kit converts the entire vehicle to a reliable coil spring/strut suspension system. Also look for a kit the required no special tools and comes with detailed installation instructions.

http://www.arnottindustries.com/part_LINCOLN_yid2_pid7.html

This is a common problem for all Lincolns. Since the front rises but can't hold the air, it's a good sign that you don't have any compressor problems. You probably hear the compressor constantly clicking on to try to keep the front end inflated.
The most common cause is a leak in the air spring. It is often referred to an "air bag" which is basically a cartridge that fills and releases air based on the load. The most common repair is to replace the air spring (it's advisable to replace 2 at a time). There is another solution to replace the air spring(s) with a conventional aftermarket shock type spring setup. It's a matter of personal preference. You would still get a nice ride from a conventional shock absorber setup. Although more expensive, I've always preferred to go with the air spring replacement to keep the classic "Lincoln" ride intact.

YOU NEED A STAR 2 TESTER 007 - 0041 - A OR DIAGNOSTIC EQUIPMENT THAT IS EQUIVALENT TO TURN ON AIR COMPRESSOR TO TEST AND REGULATE AIR TO AIR SPRINGS. ALSO RESET THE AIR SPRING COMPUTER.IF YOU NEED TO RELEASE AIR FROM AIR SPRINGS TURN OFF AIR SUSPENSION SWITCH.THEN REMOVE AIR SPRING SOLENOID RETAINING CLIP,ROTATE THE SOLENOID COUNTERCLOCKWISE TO FIRST STOP, THEN PULL SOLENOID STRAIGHT OUT SLOWLY TO THE SECOND STOP UNTIL ALL AIR BLEEDS OUT AIR SPRING, THEN REMOVE THE SOLENOID. YOU COULD HAVE DAMAGED FRONT AIR SPRINGS WHEN YOU CHANGED OIL WITH OUT TURNING OFF AIR SUSPENSION.WHICH CAUSED AIR SPRINGS OVER EXPAND DAMAGING THEM.

CHECK AIR SPRINGS SOLENOID O- RINGS FOR LEAKS.LISTEN FOR AIR LEAKS AROUND EACH AIR SPRING. WHILE CAR ON GROUND. IF YOU SPOT A LEAK.TURN OFF AIR SUSPENSION OFF FIRST.THEN SAFELY RAISE VECHICLE.REPLACE ALL AIR SPRINGS SOLENOID O - RINGS BUT FIRST BLEED AIR OUT OF AIR SPRINGS FIRST BY REMOVING AIR SPRING SOLENOID CLIP THEN SLOWLY PULL AIR SPRING SOLENOID TO SECOND STOP DONT PULL ALL THE WAY OUT.TO SAFELY LOCK OUT VECHICLE REMOVE NEGATIVE BATTERY CABLE TO KEEP AIR COMPRESSOR FROM TURNING ON.YOU DONT WANT AIR IN SPRINGS WITH VECHICLE IN THE AIR. DONT TRY REMOVE AIR SPRING UNTIL ALL THE AIR IS OUT.YOU NEED A FORD TESTER TO DO A FUNCTIONAL TEST ON AIR SPRINGS.

No. they are different platforms and could result in a serious accident. they make conversion kits to eliminate the air ride suspension and are designed specifically for this particular car.

the height sensors work as relays. it lets the computer know when an air spring needs air. if one air spring needs air, but all the others are level, the air spring needs replacing. it means it's leaking.

there are 2 ways of fixing that problem you can replace whats broken which is more than likely the air bags, which is expensive, or you can get an aftermarket set up with regular springs and do away with the air bag system completely it's not hard to convert it over just unplug the compressor jack up the car to lift the weight off of the suspension put a jack under the rear end housing and loosen the the shocks and lower the rearend housing remove the air bags put springs in their place jack up the rear end bolt shocks back up and your done.

new springs need by the sound of it

If you failed to shut off the air suspension switch (located in the trunk) you may have blown an air line when you jacked the car up. All Lincolns equipped with air suspension should have it shut off whenever jacking up the car. You can try to turn the switch off and back on to see if the air springs refill but if not, trace the air lines from the compressor to both the front and rear to check for a blown line. If you don't detect a blown line, you may have damaged the air springs.