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Ride height is low on front and rear. No leaks found, and compressor runs.Front tires have rotational chunks missing out of them on inside and outside edges. Looks like rubber from tires is on upper cotrol arms. Does this veickle have a problem with ride height sensors?

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Check with the certificate of homoglonation for the correct tyre size ,have a feeling it has ocersize tyres on this vehicle which it wasnt designed for

Posted on Oct 16, 2010

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I changed tire size from low pro to 11/22.5 now have powertrain vibration on a 2010 peterbilt 388 with front air ride


You need to adjust the ride height on both drive axles to specs or you will get a vibration.

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1997 mark8 front air ride slamed


Have you checked the height sensor for the front, and the system for leaks ?

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Air suspension compressor sounds bad and wont pump up the rear on a 2003 mercury grand marquis


What is odd is the compressor stopping after so short a time. It may be your only problem.

When you have a leak in the system, the compressor keeps running because the sensors do not signal for it to shut off. On your vehicle it is either being told to shut off prematurely or the compressor is triggering a circuit breaker.

There are ride height sensors on the rear. If the vehicle was lifted without turning off the Air ride, the sensors may have been stretched.

You can check for air leaks in the suspension bags, and air lines using a spray bottle of soapy water. There is also a Master dump valve that should be ahead of the Drivers front tire/radiator well area. It is not a concern unless there is no pressure in the system.

Finally, just as the engine can express diagnostic Codes, so can the suspension. You need a better scanner to do this function. It is the quickest way to find the problem.

Please rate my info.

Jan 22, 2013 | 2003 Mercury Grand Marquis

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1991 Lincoln Mark VII air ride suspension trouble shooting


Most likely have a leak in the front air system. Could be a line or one o the air bags. Could also be a missing or misadjusted ride height indicator.

Dec 12, 2012 | 1991 Lincoln Mark VII

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2004 jaguar xj8 reads vehicle to low.. where do i put oil for the front shocks to solve this problem??


You can't add oil to the shocks. You may have faulty shocks but not likely. This vehicle uses a compressor and fills the gas shocks with air to adjust ride height. You could have a faulty compressor, an air leak in the system or the sensor which indicates the actual height is faulty. I'd recommend getting it diagnosed at a reliable alignment or tire shop. Sometimes scanning the suspension system may have a fault code that disables the system.

Jan 26, 2011 | 2004 Jaguar X-Type

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Air ride compressor runs when i shut off engine car is level no change in height when running just runs all the time had to unplug it to get it to quit but ride is still ok does this mean that the...


There is a switch under the rear of the car that actuates the compressor when the ride height falls below a preset level. The switch could be out of adjustment from being hit with road debris, causing the compressor to run al this time. Or there could be an air leak causing the air shocks to be constantly trying to raise the ride height. If there is an air leak, the back of the car would be much lower than the front, but still maintain ride quality.

Dec 30, 2010 | 1993 Buick Park Avenue

1 Answer

Back end of my 2001 Ford Expedition FWD, Eddie Bauer, was dragging. Had diagnostic test run and found out it needed a new air ride compressor. Had compressor installed, but compressor continues to run...


The compressor should only run until the rear suspension reaches the desired height. If it continues to run after the suspension has raised to ride height then you may have a leaking air bag/solenoid or line. If you dont have any leaks it is possible the EVO(air suspension module} or relay is at fault.

Nov 14, 2010 | 2001 Ford Expedition

1 Answer

Air Ride Sensors Corroded?


you buy a car with all these electronics. ride hieght sensors for each wheel. this is affecting that. then when you go to the dealership you want them to replace only the exact one piece that fails. that could take hours of diagnosis time. at damn near 100 per hour. go ahead and give them the car. let them do diag. total price 2000. or you have narrowed it down to brains or sensor. do it yourself 1000. problem solved it should cost 1000-2000 to fix. if u find parts cheaper. money in your pocket

Jan 22, 2009 | 2003 Lincoln Navigator

2 Answers

AIR SUSPENTION WORKS ABNORMALY


a lot of info here:
Principles of Operation
The 4-wheel air suspension (4WAS) module commands changes in vehicle height that are necessary for both the load leveling and the vertical height adjustment features.
The 4WAS load leveling feature automatically makes adjustments in vehicle height so that the vehicle is always at trim height, and that constant front-to-rear vehicle attitudes are maintained over the load range of the vehicle. Adjustments in height that are necessary to correct height differences between the vehicle left and right sides for the 4WAS system are restricted to what can be reliably achieved with three height sensors.
The height adjustment feature has three vehicle heights within a two-inch span:
Kneel height — improves the ease of entering and exiting by lowering the vehicle one inch below the trim height in the front and rear when the vehicle ignition is in the OFF or LOCK positions and the vehicle is stationary.
Trim height — normal vehicle ride position; vehicle moves to trim position when the ignition is ON, when the transmission is initially shifted to DRIVE or REVERSE mode, when all doors are closed or when speed of more than 24 km/h (15 mph) is detected.
Off-road height — improves ground clearance by raising the vehicle one inch above trim height in the front and rear when the vehicle is at 4x4 low modes and the vehicle speed is less than 40 km/h (25 mph).
The 4WAS module uses the universal bus protocol, (UBP), module communications network for sending and receiving various signals with the exception of speed, information from the three height sensors, and the air suspension service switch. For additional information about UBP, refer to Section 418-00 .
The 4WAS system holds vehicle height when any door or rear hatch is opened. The system stores front and rear vehicle height the moment any door is detected open. The system then maintains this height regardless of the addition or removal of a load. The system returns to its commanded height when all doors are closed or vehicle speed exceeds 24 km/h (15 mph).


Vehicle Height Modes Ignition State Transfer Case Mode Speed or Speed Range Resulting Vehicle Height OFF 4x2, A4WD, 4x4 HI N/A Kneel (TRIM - 25 mm) ON and RUN 4x2, A4WD, 4x4 HI All speeds TRIM ON and RUN 4x4 Low Below 40 km/h (25 mph) Off-Road (TRIM + 25 mm) ON and RUN 4x4 Low Above 40 km/h (25 mph) TRIM OFF 4x4 Low N/A Stays at current position (prior to ignition transition)
Air Suspension Service Switch
The air suspension service switch signal is needed to wake up the 4WAS module. Without the module receiving this signal, the 4WAS system is inoperative at speeds below 24 km/h (15 mph) and will not react when the vehicle is raised or lowered. At speeds above 24 km/h (15 mph), the system will be active as if the air suspension service switch is in the ON position.
Vehicles without message center When the air suspension service switch is in the OFF position and the ignition switch is in the RUN position, a "CHECK SUSP" will appear in the RH corner of the instrument cluster.
Vehicles with message center When the air suspension service switch is in the OFF position and the ignition switch is in the RUN position, the message center will display "SUSPENSION SWITCHED OFF"
Air Compressor
The air compressor:
  • consists of the compressor and vent solenoid; neither are replaceable as individual items.
  • is a single cylinder electric motor driven unit that provides pressurized air as required.
  • is powered by a solid state relay, which is controlled by the 4WAS module.
  • passes pressurized air through the compressor air drier that contains silica gel (a drying agent). Moisture is then removed from the compressor air drier when vented air passes out of the system during vent operation.
  • has a single port drier that can be replaced separately.
The vent solenoid:
  • allows air to escape from the system during venting actions.
  • is part of the air compressor cylinder head.
  • shares a common electrical connector with the air compressor motor.
  • is enclosed in the cylinder head casting, which forms an integral valve housing that allows the valve tip to enter the pressurized side of the system.
  • has an O-ring seal that prevents air leakage past the valve tip.
  • opens when the 4WAS module determines that lowering is required.
  • provides an escape route for pressurized air when system pressures exceed safe operating levels.
  • has a 1034 kPa (150 psi) internal relief valve.
  • is installed with the air compressor as a unit.
Air Spring
The 4WAS system has front and rear air springs. The air springs provide a varying spring rate proportional to the system's air pressure and volume. The air suspension system regulates the air pressure in each air spring by compressing and venting the system's air. Increasing air pressure (compressing) raises the vehicle; decreasing air pressure (venting) lowers the vehicle. Vehicle height is maintained by the addition and removal of air in each air spring through an air spring solenoid installed in the upper spring cap and energized through the 4WAS module command.
Air Lines and Fittings
NOTE: Apply a soapy water solution to the air lines to verify the location of air leaks. If the air lines are cut, ruptured or leaking, a service repair kit is available.
Nylon air lines with quick connect fittings connect to the air compressor and air spring solenoids. The compressor assembly output line is divided by the use of a fitting to supply the front and rear air springs. Fittings are also used to divide the air supply to the RH and LH air spring solenoids.
Air Suspension Height Sensors
There are two sensors used for the front suspension and one sensor used for the rear suspension. The sensors send a voltage signal to the 4WAS module. The output ranges from approximately 4.50 volts at minimum height (when the vehicle is low or in full jounce) to 0.50 volt at maximum height (when the vehicle is high or in full rebound). The sensors have a usable range of ± 45° compared to total suspension travel of 196 mm (7.84 in) at the front wheels and 240 mm (9.6 in) at the rear wheels. Therefore, the sensors are mounted to the suspension at a point where full suspension travel at the wheel is relative to the travel at the height sensor. The front height sensors are mounted to the frame and the links are attached to the upper arm ball studs. The rear height sensor is mounted to the frame and the link is attached to the rear lower arm ball stud.
When the height sensor indicates that the vehicle is lower than trim under normal driving conditions, the air compressor will turn on and pump compressed air to the system. When the sensor indicates that the vehicle is raised above trim under normal driving conditions, this will cause the air to be vented from the system to lower the vehicle to its trim height level.
Compressor Relay
A solid state relay is used in the air suspension system for compressor control. The relay incorporates a custom power metal oxide semi-conductor field effect transistor (MOSFET) and ceramic hybrid circuitry. The relay switches high current loads in response to low power signals and is controlled by the logic of the 4WAS module.
The compressor solid state relay is energized by the 4WAS module to have high current flow from the battery to the compressor motor.
4-Wheel Air Suspension (4WAS) Module
NOTE: The 4WAS module must receive a ride height adjustment calibration and must pass a pneumatic test when it is installed new or swapped.
The 4-wheel air suspension (4WAS) module controls the air compressor motor (through a solid state relay), all air spring solenoids, and provides power to front and rear height sensors. The 4WAS module also controls vehicle height adjustments by monitoring the three height sensors and other universal bus protocol (UBP) signals. The 4WAS module conducts all fail-safe and diagnostic strategies, and contains self-test and communication software for testing the vehicle and related components.

Jan 06, 2009 | 2003 Lincoln Navigator

2 Answers

Air Ride on 1994 Buick Park Avenue


You have what is called a height/load leveler switch located on rear axle of vehicle .Check to see if the arm (which moves and kicks on compressor when ride height is low) Is connected and moving freely..You then might want to make sure that the air supply lines atatched to air shocks or air bags are not leaking.. If all checks out fine and you decide to disable compressor you can do this by unplugging harness that connects to compressor...And then you can manually adjust your ride height by adding air to the valve on compressor (it resembles a tire valve stem) this will adjust your your ride height and you can let air out at same location if lower height is desired.. This is a little inconveinient but will bypass automatic system as you requested.

Dec 26, 2008 | 1991 Buick Park Avenue

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