[TxBuicks]

Thanks for all the comments and suggestions. I went back with the original style air shocks. I took it to a Buick dealership and asked them to determine the real cause of the problem. Basically, I asked them if the air compressor and lines were good. When they said that was all good, I then had them replace all 4 shocks and purchased new tires, too. The car drives like it did brand new and, so far, I'm happy with the decision to keep it original. My faith in the design has been restored.

[sosuzguy]

Gee I'm glad to finally find out someone else has trouble with these. While I absolutely refuse to switch my system to the manual method of adding air I can't seem to get my system to maintain the 15-20psi in the system that the service manual says it should. Within an hour or two it leaks down. I know I have a leak on the shock end but with this handy tool I made it is also showing a leak down on the compressor side but I can't hear any air escaping nor does any bubbles show up with a spray of water and soap. Here is my most recent posting. Paul I've already sent you an email tonight about this one!
Cupping of rear tires on the 85 Riviera

If anyone would like a nice overview of why this system is on our cars I found this today. http://www.hemmings.com/hcc/stories/...feature17.html

I also found this tech article which states "To ensure system is operating with at least minimum air pressure, height sensor commands an air replenishment cycle each time ignition is turned on. " SO maybe it's not uncommon for small air leaks between drive cycles? But then again this article was in response to a question about a 98 Deville.
http://www.2carpros.com/forum/viewtopic.php?p=469372