I keep seeing people go straight to "you need to replace them". I don't believe this is always the case, and I'm wondering if anyone has figured out if there can be a module, or controller going on some of these. Here's what I know about my 1990 LS400: The rear end are the only ones to leak down. If they leak down to "bottom" I can unhook the positive battery cable for a while (hour?) and reconnect to resolve the issue. I hear the air only hissing out of the driver side wheel well when the car dumps. If I grab the fender and lift, or place a jack under the body in front of the rear driver's wheel, the hissing stops and it will begin to lift, but only for a short while. When I lift the car high enough, the hissing stops. This makes me think that I'm overcoming something like a valve/solenoid. When I disconnect/reconnect the positive terminal, it takes about 75-85 miles to dump again. This leads me to believe the bags are not leaking, but something that controls the fill is resetting, then failing. So, to sum it up;
Bags do not truly seem to leak (air bleed only on driver side, though both rears dump)
Resetting the electronics via battery disconnect resolves it temporarily (similar to a computer reset)
Air bleed occurs from the rear driver side area (perhaps the location of a solenoid/valve)
I can raise the rear driver side with a jack to overcome the bleed (as if there's a point where I've relieved the pressure that's keeping the valve open)
Anyone have a clue what to start working on to keep my air?
