Air suspension/04/XJ8
#1
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I don't think I've read this problem. My car drops an inch or two every night. I've disconnected the battery, same thing. Changed the relay, still the same thing. Ordered the shocks from Arnett. Over Christmas the car was not used for two days. Then the shocks arrived and the car did not drop or if it did it pumped itself up before turning on. Last night it dropped again. Now I'm not sure whether to install the shocks. If it has a leak they would have been down after 2 days. Any idea?
Thank you in advance.
Thank you in advance.
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rhodietwo (01-12-2011)
#3
#4
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I feel like when you are in the car, you are weighing it down. If you shut the car off, and then get out, that weight is being lifted. So the car naturally rises up as you get out. To return the car to a normal level, the air suspension releases air. This gives you the impression that it is sinking as you get out. AT least that's what I imagine!
#5
![Default](/forum/images/icons/icon1.gif)
I don't think I've read this problem. My car drops an inch or two every night. I've disconnected the battery, same thing. Changed the relay, still the same thing. Ordered the shocks from Arnett. Over Christmas the car was not used for two days. Then the shocks arrived and the car did not drop or if it did it pumped itself up before turning on. Last night it dropped again. Now I'm not sure whether to install the shocks. If it has a leak they would have been down after 2 days. Any idea?
Thank you in advance.
Thank you in advance.
It would be good to fully understand all of the "modes" the ACM uses before assuming there is a problem and changing very expensive parts for nothing. The ACM utilizes 5 different modes of operation based on "activity" and ride hieght is monitored differently through these modes. They are:
Sleep Mode
Preliminary
Post
Stance and
Drive Mode
It is too detailed and complex to rewrite this but I have posted complete explanations and what happens to ride height in each of these modes. The search feature should find it for you.
Also, a phenomenom for which you should be aware - In very cold weather, air pressure is often lost in these air springs causing the car to be lower over night. In sleep mode, the ACM only checks ride height every 24 hours, so, if the car was used in the afternoon, then again by next morning, the system will not have replenished air pressure in that time. Therefore, when the car is started, the system will restore the ride height which you will physically feel as the car is started and the ACM moves from sleep to stance through drive modes.
Last edited by steve11; 12-29-2010 at 09:19 AM.
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#7
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#9
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I feel like when you are in the car, you are weighing it down. If you shut the car off, and then get out, that weight is being lifted. So the car naturally rises up as you get out. To return the car to a normal level, the air suspension releases air. This gives you the impression that it is sinking as you get out. AT least that's what I imagine!
#10
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When you exit the car in any mode other than sleep mode (which is impossible to do), the same occurs, the ACM maintains ride height by reducing air pressure in the rear air springs. Bottom line, you really shouldn't notice much change in ride height, even when paying close attention, when entering or exiting the car during Drive mode.
Last edited by steve11; 12-29-2010 at 11:29 AM.
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amcdonal86 (12-29-2010)
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eastsidejp (01-19-2011)
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