stock air suspension problems
#1
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Thread Starter
stock air suspension problems
The symptoms I'm getting are with the rear, front is fine. The back shocks drop like there's no air. If I switch the control to "high" nothing happens but if I drive it for about 10 miles they will raise up and stay good for a while, sometimes 1 day, sometimes 2 or more. I can't hear if the compressor is working b/c I have a very loud noise coming from a servo motor on the heater assembly. No codes come up when I check it. I've never worked on this system before and I don't have my manual. Question is, what and how do I check? Any input is appreciated.
#2
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Thread Starter
I figure it's a loose electrical connection somewhere b/c it's intermitent. I can turn on the compressor from the ECU so I know that's good but it still wont pump up the rear shocks. I need to check more when I get a shot but from what I've read elsewhere it might be the connection on the alternator. (Of course the PS fluid is leaking on it) Everything is starting to go wrong at the same time with this car.
#3
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Thread Starter
Well,.......it has done it again. I went out this morning and the rear was dropped to the ground. It's been fine all week so I didn't think about it. But now I'm almost convinced the rear height sensors are effected by the heat somehow. It was 98 and very humid yesterday, same as when it happened last week. Has there been any common problems with these sensors, over the years or maybe condensation in the air lines?
#5
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Thread Starter
Thanks for the idea, I'll give that a shot. Anyone ever ride with the air ECU unhooked? Just wondering how the ride feels w/o it adjusting itself. Will that do anything to the shocks themselves, not letting the air release from the relief valve? I just dont want to blow a shock and have myself some more problems.
#6
Well,.......it has done it again. I went out this morning and the rear was dropped to the ground. It's been fine all week so I didn't think about it. But now I'm almost convinced the rear height sensors are effected by the heat somehow. It was 98 and very humid yesterday, same as when it happened last week. Has there been any common problems with these sensors, over the years or maybe condensation in the air lines?
#7
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Thread Starter
update
I can't believe it, a year went by with it working pretty much normal.
Now, its acting up again. I never fixed anything on it b/c it was working. For a while now (8-9 months) if the car sits about 10 hrs the rear lets out more air then the front. But it always pumped up to normal when I started the car. The past couple days the compressor hasn't come on. I haven't checked anything yet due to a work injury. (Rotator cuff, right shoulder) But I am more convinced the problem IS due to the heat and the height sensor. It has been very hot and
humid the past couple weeks.
Just figured I would give an update incase anyone searches for the same problem in the future.
Now, its acting up again. I never fixed anything on it b/c it was working. For a while now (8-9 months) if the car sits about 10 hrs the rear lets out more air then the front. But it always pumped up to normal when I started the car. The past couple days the compressor hasn't come on. I haven't checked anything yet due to a work injury. (Rotator cuff, right shoulder) But I am more convinced the problem IS due to the heat and the height sensor. It has been very hot and
humid the past couple weeks.
Just figured I would give an update incase anyone searches for the same problem in the future.
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#8
Moderator
I know a Japanese guy who has experienced a similar problem with you. But his problem was at the front side only. Both driver and passenger side of air suspensions were too low time to time. But the rear was always OK.
To make a long story short, it was caused by an O-ring used at the height control valve for the front. There are 2 different valves for the front and the rear. The O-ring of his 98 Celsior had a minor scratch and it caused the problem intermittently.
Those two are controlled by the ECU for the air suspension. Other than those two, there are "suspension control actuators" that are also controlled by that ECU but those are related only for a single suspension.
Since you have the problem for rear two suspensions and I assume that the height control valve for the rear has some problem.
To make a long story short, it was caused by an O-ring used at the height control valve for the front. There are 2 different valves for the front and the rear. The O-ring of his 98 Celsior had a minor scratch and it caused the problem intermittently.
Those two are controlled by the ECU for the air suspension. Other than those two, there are "suspension control actuators" that are also controlled by that ECU but those are related only for a single suspension.
Since you have the problem for rear two suspensions and I assume that the height control valve for the rear has some problem.
#10
Pole Position
Thread Starter
I'll check the O-rings out when my shoulder is better and as for the compressor, it works now. Something intermitent with the electrical. I can't figure it out. Oh well, one of these days maybe.
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zippinbye
GX - 1st Gen (2003-2009)
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03-07-17 07:12 AM