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Old 11-06-2012, 11:00 PM
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QSilver7 QSilver7 is offline
Officially Welcomed to the 'Fest
Location: Northeast Indiana
Join Date: Aug 2008
Posts: 9,045
Mein Auto: 1997 740iL / 2006 X5 4.4
On the e39 Tourings with air springs...your symptoms sound like it time to replace the air springs. If you do a quick search on that forum or google search for failed BMW air may see lots of past posts with similar issues as you've expressed here.

Have you had a chance to take a look at them? Sometimes it's obvious that its time to change them because the air bag (spring) is cracked where the rubber folds as the bag expands and contracts (see item #1 in diagram below)...and you should be able to find images on the internet of old/cracked air springs.

Below is a quote from 2010 from a discussion on the e39 forum (the Touring wagon has the same pneumatic airbag/air spring set-up)..and you can see how the rubber off the airbag on the left is cracked where it folds over near the top:

Originally Posted by ND4SPDLSC View Post
You can always check the condition of air springs by looking at the condition of the rubber at the base of the spring as it fold over itself. If you see cracking/dry rubber, your springs will go at some point in the near future. When exactly is difficult to pinpoint, but usually you do get one corner or end of the car sinks overnight. If it leaks down over time, you usually have a leaking spring that will need replacement very shortly. The sooner the better as leaking springs leads to additional wear on the compressor.

Good luck.
Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

Last edited by QSilver7; 11-07-2012 at 03:59 AM.
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