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Registered
1991 Deville
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34 Posts
Discussion Starter #1
ELC system symptons.
1. Turn the key on, the compressor does come on after 45 seconds and then shuts off after about 3 seconds.
2. Loading weight into trunk the compressor does not come on.
3. If I remove ELC Height Sensor Link and move the lever manually the compressor does come on.
4. When the compressor is running the shocks do not inflate.
My next test would be to remove one of the air lines and see if the compressor is pumping out any air.
However reading up on this system, it would seem the shock bladders are leaking, probably due to age, and won’t raise the car.
Question; are there any more test to pin down the problem? I have also read that if the bladders are leaking the compressor will run continuously, mine doesn't.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,289 Posts
Re: Elc, 5/6/15

ELC system symptons.
1. Turn the key on, the compressor does come on after 45 seconds and then shuts off after about 3 seconds.
2. Loading weight into trunk the compressor does not come on.
3. If I remove ELC Height Sensor Link and move the lever manually the compressor does come on.
4. When the compressor is running the shocks do not inflate.
My next test would be to remove one of the air lines and see if the compressor is pumping out any air.
However reading up on this system, it would seem the shock bladders are leaking, probably due to age, and won’t raise the car.
Question; are there any more test to pin down the problem? I have also read that if the bladders are leaking the compressor will run continuously, mine doesn't.
======================
other problem areas could be

a failed exhaust solenoid -

leaking air lines -

leaking bladders -
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,793 Posts
Re: Elc, 5/6/15

2. Loading weight into trunk the compressor does not come on.
3. If I remove ELC Height Sensor Link and move the lever manually the compressor does come on.
Maybe you're not putting enough weight into the trunk.

4. When the compressor is running the shocks do not inflate.
Question; are there any more test to pin down the problem?
Get the compressor to run and then spray down all the fittings and shock boots with soapy water. The leak will start to foam.
 

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Registered
1991 Deville
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34 Posts
Discussion Starter #4
Re: Elc, 5/6/15

I though if the lines leaked the compressor would run constantly to try and pressurize the lines?
 

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Registered
98 DeVille, 97 DeVille d'Elegance
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7,345 Posts
I though if the lines leaked the compressor would run constantly to try and pressurize the lines?
The computer shuts off elc after around a total 8 minutes of run time between ignition cycles to prevent it from being destroyed.
 

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Registered
1991 Cadillac Sedan deVille
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591 Posts
Re: Elc, 5/6/15

When I still had my old shocks the rear was not at an adequate level, however my compressor did not run all the time. Maybe mine had most of their oil leaked out and the bladders were actually not leaking. Anyway, one of them failed seized up and I just had them replaced. Good replacement shocks are not that expensive, and given the age of your car they might be at the end of their useful life.
 

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Registered
1991 Deville
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34 Posts
Discussion Starter #7
Re: Elc, 5/6/15

This car has been sitting with very LOW mileage over its lifetime; it only has 50000 miles on it. I will assume the bladders in the rear shocks are bad due to age, but here is another question, since the car was not driven that much and sat in the garage most of the time the shocks would not have been exercised that much. Don't most shocks ware out from use?
 

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Registered
98 DeVille, 97 DeVille d'Elegance
Joined
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7,345 Posts
This car has been sitting with very LOW mileage over its lifetime; it only has 50000 miles on it. I will assume the bladders in the rear shocks are bad due to age, but here is another question, since the car was not driven that much and sat in the garage most of the time the shocks would not have been exercised that much. Don't most shocks ware out from use?
My rear shocks leaked at less than 50k just due to age. One of the pitfalls of low mileage cars is things just age out.
 
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