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Hate to beat a dead horse but....air suspension issue

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Old 01-08-2014, 07:32 AM   #1
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Default Hate to beat a dead horse but....air suspension issue

Hello All,

I have a 2004 Audi A8. Since I got it I have noticed the ever persistent solid orange light after about 15 minutes of driving. I figured it was a small leak and I need to get it in before the compressor decides it's had enough and dies one me. As long as I kept it in dynamic there was no issues, trying to go any higher and the compressor couldn't keep up. Once the cold hit I got the flashing orange and green lights, my front end was completely flat. Parked it in the heated garage, once it thawed I was able to turn it on and it pumped up fine. I have an appt the 18th of this month to get it inspected. Was hoping it wouldn't be a strut....

Now here is the weird thing, I got my tires replaced about a week ago and on the way home the flashing green and orange lights came on again...i thought great the front end is down again. I limped her home to notice the front was perfectly fine....but the back was all the way down to the floor. Now I have never ever heard of this happening on the A8 as they are suppose to have an air reserve in the struts.

Let the car warm up turned it on and it pumped up to normal height and it hasn't happened since (been about a week).

So now i'm thinking it is probably not the struts that are bad since the front ones that normally fully deflate stayed up fine while the backs went flat. Is this starting to point at the combi valve as being the culprit?
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Old 01-08-2014, 08:14 AM   #2
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I did have a tech tell me he had seen some problems with the valve block on 2004's.
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Old 01-08-2014, 08:20 AM   #3
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It looks like Valve Block problem. You have to scan it first.
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Old 01-08-2014, 09:17 AM   #4
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Thank you for the quick replies! Mishar I don't know how you get to every post on these forums but I have followed a lot of your advice since owning this car. So thank you.

I got codes

01583 - Leak in System Detected - frequency 89
01400 - suspension level control; lower limit exceeded - frequency 89
01772 - level control pressure sensor G291 - frequency 70
00776 - Level Control System Sensor; Front Left (G78) - frequency 1

I am thinking the last one is just a fluke due to the extremely cold weather here.
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Old 01-08-2014, 11:29 AM   #5
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First thing is that leak. It is probably one of front struts. You have to find it with soapy water.

Rest of it may be OK but you will see once there is no leak.
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Old 01-08-2014, 11:36 AM   #6
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You would still think it could be a strut leak? It just seems odd, if a strut was leaking wouldn't that one always deflate before/when another deflates? normally the front two are the ones to fully deflate, but when I had the back two fully go down and the fronts were fine....it made me rethink if there was an air leak in one of the struts since if so it would have went down before the back two did.


I could be completely wrong but it would just make sense. :/
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Old 01-08-2014, 01:17 PM   #7
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You are right. Leak could be from Valve Block. May be difficult to detect it if it is intermittent. It could be caused by freezing if there is any amount of water in the system. Compressor has dehumidifier but I don't think it can last forever. I don't have experience with that but it may be good to check it. I should do that too. It might prevent other problems.
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Old 01-09-2014, 05:38 AM   #8
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That would make sense, it didn't really fully deflate until it got to the negative temps, and would not inflate until i got the car in a heated garage. So there is definitely water in the lines somewhere. I read some other post where the owner took apart his compressor to find it was full of water which leaves me worried. :/

Is the dehumidifier integrated into the compressor, or completely separate component?
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Old 01-09-2014, 07:14 AM   #9
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Dehumidifier is part of the compressor.
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Old 01-09-2014, 07:34 AM   #10
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I'm experiencing the left front leak overnight issue now.
Sometimes also after a 12hr day at work also. I am thinking strut at this point, but will have to do some leak checking come spring time. Pumps right up when comes out of sleep mode via the reservoir.
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Old 01-09-2014, 07:39 AM   #11
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Yeah if it is just that corner then more than likely a strut. I have found that you can get a pair of new struts from 1a auto for about 900 bucks. They are out of stock until about April though. or so they tell me anyways.
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Old 01-09-2014, 07:50 AM   #12
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Quote:
Originally Posted by 1Wasserwerks View Post
I'm experiencing the left front leak overnight issue now.
Sometimes also after a 12hr day at work also. I am thinking strut at this point, but will have to do some leak checking come spring time. Pumps right up when comes out of sleep mode via the reservoir.
You should not wait spring to attend this. It can kill your compressor by than.
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Old 01-09-2014, 07:51 AM   #13
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If you don't mind limping around you can leave your car in jack mode. Then the compressor never turns on


*This is not advised! Just a joke *
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Old 01-09-2014, 08:54 AM   #14
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Quote:
Originally Posted by mishar View Post
You should not wait spring to attend this. It can kill your compressor by than.
I was afraid you were going to say that Mishar.
I've read up on the whole leak/relay/compressor issues. I'm not thrilled already. Luckilly it still is holding under regular operation, I am only driving 13 miles per day and I have other vehicles to drive. 65hr work week cuts into my testing/wrenching time and I am not going to bring it to the stealership if this is something I can do myself.
Nick, thanks for the heads up, I'll be doing some price shopping for sure. (And NOT driving around in jack mode)
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Old 01-09-2014, 09:10 AM   #15
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Quote:
Originally Posted by Nick Conlon View Post
If you don't mind limping around you can leave your car in jack mode. Then the compressor never turns on


*This is not advised! Just a joke *
Unfortunately it wont work. Jack mode. Joke works. It goes off at 5 mph (8 km/h).
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Old 01-09-2014, 09:44 AM   #16
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For all its ups and downs, there is an example of your Audi saving your butt once again. :P
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Old 01-10-2014, 05:35 AM   #17
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The $900 seems like a very good deal. I just did this replacement (front passenger side) a few weeks ago. I bought my strut through Partsgeek and it is an Arnott Industries rebuilt strut. I paid ~$675, and I am still waiting on my core charge refund. The repair took me around 4 hours, and it would have been a good hour shorter but I had problems getting the pinch bolt out in order to free the upper control arms.

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Old 01-10-2014, 03:29 PM   #18
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Quote:
Originally Posted by 1Wasserwerks View Post
I'm experiencing the left front leak overnight issue now.
Sometimes also after a 12hr day at work also. I am thinking strut at this point, but will have to do some leak checking come spring time. Pumps right up when comes out of sleep mode via the reservoir.
Chris, are you seeing anything in your VAGCOM scans?

i am pretty consistently getting a drop on both front and rear for that matter over night. not a complete drop by measurements, and they all seem to be equally dropping. i get nothing on my scans and haven't seen the yellow or green light yet.

i would have expected to see that 01583 come up if there was a leak, but again nothing on the scans.
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Old 01-11-2014, 01:56 AM   #19
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Zed,
Hopefully between today and tomorrow I will run a vag-com scan on the car. I am suspecting I won't find a leak error. Yesterday with it snowing in the morning I left the car in "lift" mode for the drive to work. Came out to left front low (but not slammed), right front was also lower. Now I am thinking metering block as well, or both struts? I'll do the scan first then some leak checking. Not sure when I'll get the the leak check. Rears appear to be unaffected at this point.
Oh. Drove home in "dynamic" readjusted to "lift", allowed it time to adjust and then parked it in jack mode, same results at 5am.
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Old 01-11-2014, 09:38 AM   #20
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Scanned when I got home, no errors. I think I went in the right area and checked compressor pressure and temp. Cycled the suspension up and down, watched the vavling open and closing etc.
Both front were noticeably lower when I got out of work. Damn.
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Old 01-11-2014, 09:38 AM
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