Mechanics

AIR SUSPENSION DUMPING PRESSURE

2003 GMC Envoy

Suspension problem
2003 GMC Envoy 6 cyl Two Wheel Drive Automatic ~60000 miles

This is an odd problem for me in that the problem is not persistent. We have the load-leveling package with the air suspension. What is happening is that we'll come back to the vehicle after it's been sitting, and find the rear air bags completely deflated, with the rear end completely lowered. But after we put the keys in the ignition, it will inflate just fine and ride just fine. The compressor doesn't have to turn back on (to re-inflate) while we're driving it. It seems to hold air.

Now the odd part. We can leave the vehicle sit for DAYS, and it doesn't deflate a quarter inch. Yet other times, we can come back in a hour and it's completely deflated. I have NEVER seen, or heard it losing air. But it obviously does, as I said it can completely deflate in an hour. Originally, this happened once or twice a week. Now, it's about 5-7 times a week, so it does appear to be getting worse. I'm thinking of putting a webcam on it overnight so I can see if it's a gradual or fast dump of pressure.

I can't understand what could be wrong where it would retain air indefinitely sometimes, but other times completely deflate, like the system purged air.

I've done a quick check for leaks, and didn't find anything, but didn't have much room under there. I plan to lift it and try again. But I need more ideas.

Help!
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Swindler
April 24, 2008.




That describes my car exactly! About a year ago, I had the pump replaced, and I don't want to do that again. It is a sporadic problem, but it is occuring more frequently. And I don't think it is a leak because it does not happen all the time. Did you find a solution?
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Tiny
Jacksondad
Aug 20, 2008.
This is the same problem I have with my 2002 Envoy

Tiny
Lockie1
Oct 21, 2008.

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