Air ride help 1997 Mark VIII

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My car has always had the driver's side rear at least 3/4" lower than the passenger side rear.
I tried adjusting the rear ride height sensor down all the way but it didn't make any difference.
I replaced the solenoid valve on the drivers rear bag but that didn't change anything.
I replaced the drivers side rear bag yesterday and that's when the real problem begins.
After replacing the bag the car came up to the ride height before the bag was replaced which I could live with.
The problem now is after the car sits for 1-2 hrs the rear bags both deflate and the rears are
19 1/2" on the drivers side and 21 1/2" on the passenger side measuring from the bottom lip of the wheel to the bottom of wheel opening on the fender. I didn't touch the passenger side so I don't understand why it is now deflating. When aired up the rear drivers is 23 7/8" and rear passenger side is 24 1/4".
I'm taking these measurements after the car is raised back up and I turn the air ride switch off in the trunk. My understanding is that by turning the switch off the bags are isolated from the system and the bags should hold the air that's in them. I guess my question is, is there something common that would cause both rear bags to deflate if there is problem on one side?
If anyone could provide an air line routing diagram that would help.
I have the star II tester and the car passes all the tests.
Car has 33000 miles and bag I removed had firestone sticker on it so don't know if was factory original or a replacement.
Thanks
 
I'm sorry to hear that thing's been giving you so much trouble!

Having that tester is a nice perk. Since everything passes, I'd definitely be looking for a slow leak of some kind. The solenoid O rings (on both units) seem to me like the most likely culprit.

Many of us have been burned by trying to reuse the o-rings, only to be be facing leaking bags as you are. They definitely have to be replaced every time.
 
I'm sorry to hear that thing's been giving you so much trouble!

Having that tester is a nice perk. Since everything passes, I'd definitely be looking for a slow leak of some kind. The solenoid O rings (on both units) seem to me like the most likely culprit.

Many of us have been burned by trying to reuse the o-rings, only to be be facing leaking bags as you are. They definitely have to be replaced every time.
Thanks for the quick reply!
Last night after posting my message I decided to replace the o-rings and 10 hours later car is back to normal!
Sometimes the obvious is the answer. I didn't replace them because I had replaced the solenoid only 2 years ago.
My next project will be adjusting the left front height sensor to raise car up 1/4" on drivers side.
Thanks again, this is a great forum!
 
Glad to hear it was an easy fix.

Please keep us posted on your "leveling" efforts. I was scratching my head on that one too. "opposite corner" isn't a bad idea. I was wondering if it was more of a mount or bushing thing on one side of the rear. You'd think something like that would be spotted in the process of replacing the air springs though.
 
Glad to hear it was an easy fix.

Please keep us posted on your "leveling" efforts. I was scratching my head on that one too. "opposite corner" isn't a bad idea. I was wondering if it was more of a mount or bushing thing on one side of the rear. You'd think something like that would be spotted in the process of replacing the air springs though.
I've been playing with the height sensors in the front and after adjusting them both to 24 1/2" the rears are now both the same.
I raised the rears to 24 3/4" so car sits a little higher than stock.
A fun afternoon crawling around under the car!
I did use dielectric grease on the orings as billcu suggested.
 
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