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22nd September 2008, 08:28 AM
#1
D2 SLS Operation - advice please
I have the SLS on my 1999 D2, in the last 3 months have fitted two new airbags, new compressor and new SLS filter. All good.
Everthing works well, takes 20 seconds to pump up to Off Road Mode, does not sag or lose air overnight.
However, over the weekend, I noticed through the rear view mirror that every time I stopped at lights or junctions, the rear would lower about 20mm then the compressor would kick in and pump it straight back up to normal road height. I cannot say for certain this is a new thing, but I've certainly never noticed it before.
On stationary idle (level driveway) the SLS remains unnafected and does not "hunt", its seems to be only after slowing to a standstill that it happens.
Is this normal fellow SLS people? should I be checking fault codes? checking the height sensors? (I sprayed them with WD40, no change)
Any advice welcome,
thanks
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22nd September 2008, 09:07 AM
#2
From memory this is pretty normal, my compressor seemed to work a lot so it is always moving and changing the heights. I am not sure why it does it when you come to a stop but mine did the same thing.
Also, you talked about "off-road" mode. You might already know this but there is no need to pump up the back all the time off-road. It is really just a special "extra extension" mode for when you need to clear a very high step or you dont want to hit your rear bumper on a drop off.
The problem is that when you have it pumped up to extended height, you are not getting as much articulation from the car and the ride is a lot harsher.
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22nd September 2008, 01:57 PM
#3
Hi Simon,
Its funny you should mention that, I was only thinking about posting something the other day!! Mine raises & lowers sometimes as well. You stop at the lights & notice the car lowers or raises. I wondered if there was a different ride height for different speeds. I know some of the more newer air susp 4wds raise & lowers depending on the speed.
Dave.

Dave.
Hi.
96 Disco 1 V8.
99 Disco 2 TD5.
LROCV.
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22nd September 2008, 07:55 PM
#4
Hi Simon
I have a 1999 D2 with SLS and it does exactly the same thing at lights or after coming to a stop - always has and I'm yet to replace any component.
L322 3.6TDv8 Lux
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22nd September 2008, 08:35 PM
#5
So by the responses I read, it appears my D2 is doing what it's suppose to and now that I have the new air bags and compressors it's become noticable.
Thanks guys, I apprecaate the responses.
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23rd September 2008, 03:20 PM
#6
I think it's because as you've pulled up you've been on the brakes for just enough time for the SLS to think the rear is too high, and it dumps a little bit of pressure. I've heard of someone putting a restrictor in the outflow valve of the SLS, stops the compressor from working so hard to level out minute by minute height changes.... A quick search and you might be able to find the thread about it.
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