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1991 BMW 735iL self-leveling stays jacked up. Tried bleeding the system at the ride height sensor above the left rear half axle. It sat down but pumped right back up to too high as soon as I started t

I know that if one loosens the U-bolt on the rear anti-sway bar and rotates it in the proper direction, it can raise or lower the rear end of the car to suite one's taste, but in this case this problem just suddenly showed up. The only provocation I can admit to is the road I was driving was especially bumpy.

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Posted on Jan 02, 2017

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SOURCE: 1995 bmw 525i

Very common BMW problem. The front lateral arms that support the front to rear motion of the wheel. BMW calls it the upper, lower support arm. Two arms connect there. one left to right (think typical lower control arm, and this arm) It has a ball joint that connects to the lower most part of the strut and extends rearward to the rear crossmember and has a large bushing pressed into the arm. You can replace just the bushing if the ball joint end is ok. Bushings are about $45 each and you will need a press.

Posted on Apr 01, 2009

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SOURCE: 89 bmw 735 il self leveling rear suspension is jacked up high

hi,i own a bmw 750i,and went over a hump back bridge to fast and left the ground a bit.since then the rear suspension is jacked right up high permanently and makes a screeching sound like gas is escaping...any ideas??

Posted on May 23, 2011

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Air supension stays too high


There could be a couple of problems, first and easiest is the rear height sensor became disconnected from its mount. This is common because the sponsor clips on by a kinda weak spring and can be easily disconnected.also where the sensor mounts is a small round metal ball that screws onto frame and rear suspension, the balls after time wear to the point that the sensor spring cannot hold on.there's also an adjustment on the lower mount, if you move it up the vehicle will lower....then you could have a concern with the air compressor vent not allowing it to vent down to ride height. Or the vent solenoid on top of each bag stuck also not allowing it to vent..to ck it yourself, go for a short ride around the block and when you come back park on a level surface, shut off car, exit and close door....listen for an auditable click in the rear, and front left corner of car and watch the distance between rite and wheel lip, see if it drops. If it does I would be leaning towards the simple adjustment...also check thr front ride height on level surface, if you have a suspension problem on 1side of the car and it sits lower,it will throw off rear ride height. ...

Jun 10, 2014 | 1995 Lincoln Town Car

1 Answer

The rear air ride in my 1991 licoln keeps pumping up. Is that normal. Is there away to manually bleed the system and get the rear to go down


I think there is a height level switch of some sorts. Maybe yours is malfunctioning and the car doesn't know when to stop

Aug 17, 2011 | 1991 Lincoln Town Car

1 Answer

I have a 2001 Pontiac Montana and the self leveling system has the van stuck in the up position. It has been that way 2 days and will not deflate. What could be the problem?


a faulty height sensor...it is located in the back of the van on the rear axle beam under the van connected to the frame to axle...when u place a load in the van the height sensor compresses sending a signal to the air pump to turn on to raise the van to level height

Jul 16, 2011 | 2001 Pontiac Montana

1 Answer

Replaced rear shocks and when you turn the key on the car jacks all the way up


Check the vehicle height sensor located at the rear trailing axle. It looks like a rod with 2 ball studs on both ends, this vehicle has air ride suspension, an air compressor operates as soon as the key is on, it gets feedback from the level sensor indicating the vehicle height via the height sensor, if it is disconnected, hanging down it thinks the vehicle is sitting low and keeps pumping air into the shocks until it sees a feedback from the sensor, it will eventually stop at its max travel.

Feb 01, 2011 | 2000 Buick LeSabre

2 Answers

Lift sensor for rear of 1988 Deville


To begin with, check the "ride level" fuse and make sure that the ride level compressor does work, and you should be able to hear that the ride level compressor is working when the ride level system is leveling the vehicle.

The ride level system uses an air compressor and either an air type of shocks or a type of air billow to raise and lower the vehicle, there is an adjustment to set the ride height and it is located under the vehicle and there is a control lever or rod that should be connected between the rear axle and a switch that is mounted on the body of the vehicle, and there will be an adjustment slot in the control lever between the switch and the body, and that is how you would adjust the ride level height, but be sure that the vehicle can not drop any further down if someone is under the vehicle trying to adjust the ride height.

However, you might find that the control lever to the ride level has fallen off from the switch on the body or it has come loose from the rear axle, and it is just hanging there not operating the switch on the body that controls the the ride level compressor, or there might be a blown out air shock or billow, or you might find that an air line from the compressor is leaking and the ride level compressor will just run continuously until it blows out the fuse, and if that is the case you might also find out that the air compressor has burned out from running continuously.

I hope that this information will help you to solve your ride level problem.

Jun 04, 2010 | 1988 Cadillac Sedan DeVille

1 Answer

I have a 1992 BMW 735IL and when i start the car coolant level


your level is to low the coolent sensor can't read steam so it turns on the light... or your sensor is bad
or you have a short in the pigtail to the sensor

Feb 24, 2010 | 1992 BMW 7 Series

2 Answers

I just got a 96 Lincoln Continental... the REAR air seems to be fully inflated... jacked up rear end, and very ruff ride. I read that you have to shut the switch off in the trunk, and then manually bleed...


you have to remove the slenoid valve or just the line( to remove push in the orange ring aorund the air line,to hook back just press it in) after the reset the ride control switch and let the car run on a level surface,this will reset the ride control height.

Sep 07, 2009 | 1996 Lincoln Continental

1 Answer

1996 lincon town pump works and cuts off before airing up


I am new at the Air Suspension issue myself. My 96 is beginning to have some issues. But, have you had the Height Leveling sensor above the rear axle checked out? The position of this sensors 'arm' is what tells the system to turn on and off the Air Compressor in order to maintain a level ride height. From what I have read. these sensors wear out. A faulty sensor could be telling the compressor to kick off to soon.

Aug 06, 2009 | 1996 Lincoln Town Car

1 Answer

Rear air suspension holding air not venting, staying up to high


The air suspension uses the same vent solenoid to vent front so that will be ok. The problem will either be the rear height sensor which mounts on/near left side of rear axle. Or the air suspension module itself.
I would suspect it is the rear height sensor,the link may have come unhooked or it may be sticking or just bad.

Apr 10, 2009 | 1998 Lincoln Mark VIII

1 Answer

EXPEDITION REAR AIR RIDE PROBLEM


do you have just rear air suspension? here's rear only. 4 wheel different. Deler an run a diagnostic test with WDS machine and get fault codes.
-------------------------------------------------------------------------------------
The air suspension system is designed to improve ride, handling and general vehicle performance for static, on-road and off-road driving conditions:
  • Ride is improved by using an air type spring (the soft ride is inherent).
  • Handling is improved by maintaining constant vehicle attitude.
The system consists of unique rear air springs, the air compressor, air lines, air spring solenoids, height sensor, air suspension control module, attachments and associated signals derived from both driver and road inputs. With these components and signals, the air suspension control module commands changes in vehicle height that are necessary for the load leveling features.
The load leveling feature rear air suspension (RAS) systems shall automatically make adjustments in vehicle height so that the vehicle is always at trim height and constant front-to-rear vehicle attitudes are maintained over the expected load range of the vehicle. Adjustments in height that are necessary to correct height differences between the vehicle's left and right sides for the RAS system shall be restricted to what can be reliably achieved with one air suspension height sensor.
The system uses one air suspension height sensor, a steering sensor, generic electronic module (GEM) and other vehicle sensors to measure driver and road inputs. The system changes vehicle height using an air compressor, two air lines and the use of air springs with air spring solenoids.
The air suspension system holds vehicle height when the rear hatch or any door is opened. The system stores rear vehicle height the moment any open door is detected. The system then maintains this height regardless of the addition or removal of a load. The system will return to its commanded height when all doors are closed or the vehicle speed exceeds 16 km/h (10 mph).
----------------------------------------------------------------------------------------
Air Suspension Height Sensor
One air suspension height sensor is mounted on the vehicle. The air suspension height sensor sends a voltage signal to the air suspension control module. The output ranges from approximately 4.75 volts at minimum height (when the vehicle is low or in full jounce), to 0.25 volts at maximum height (when the vehicle is high or in full rebound). The air suspension height sensor has a useable range of 80 mm (3.2 in) compared to total suspension travel of 200-250 mm (8 to 10 in) at the wheel. Therefore, the air suspension height sensor is mounted to the suspension at a point where full rear suspension travel at the wheel is relative to 80 mm (3.2 in) of travel at the air suspension height sensor. The air suspension height sensor is attached between the No. 5 frame crossmember (upper socket) and the panhard rod (lower socket).
When the air suspension height sensor indicates that the rear of the vehicle is lower than trim under normal driving conditions, the air compressor will turn on and pump compressed air to the air springs. When the sensor indicates that the rear of the vehicle is raised above trim under normal driving conditions, this will cause the air to be vented from the air springs to lower the vehicle back to its trim height level
------------------------------------------------------------------------------
  • Uneven vehicle height
  • Circuitry.
  • Rear pneumatic fault.
  • Air compressor assembly.
  • Air suspension control module.
  • Go To Pinpoint Test I .

Feb 21, 2009 | 2001 Ford Expedition

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