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Your car has an air ride system. This means that you have an air bag at every wheel. When you start your car a system compressor starts to work and blows up each air bag evenly for a smooth ride. The noise you hear is from the rear air bag. You most likely need to replace the air bag. I will say to you shop around for best price, since this job could get expensive. Good Luck Friend.
The Stock Air Bags self Leveled, your new System should have come with PAperwork or is there a Air Nozzle that you have to fill? The Bags should come with a Pressure Window for a Firmer Ride or Softer Ride.
EACH MANUFACTURER has their Own Particular limits and ranges...
This is not a difficult job for a specialist shop used to doing the conversion but doing it yourself is NOT recommended unless you have a hoist, special tools (like spring compressors) and experience of what to remove.
Do NOT go to a dealer to be ripped off. A specialist Land Rover shop will do this job for around $1000 and save you a lot of angst
Hello, You need to find the leak in the Air-ride system. Your vehicle is trying to maintian its height and is made to cycle like it is doing. You can shut-off the system, usually from a switch located on the drivers' side rear cargo area behind a plastic access panel. DO NOT DRIVE the vehicle with the Air-ride shut off. I am only telling you about this switch to keep the battery from running down and causing starting problems, if the condition worsens.
If you are trying to fix this yourself, you can use a spray bottle and make a soapy solution to put in it. Then spray the suspension bags and air lines and look for bubbles. Then fix the leaking part.
There is a Diagnostic plug for the Air-ride system. It takes a scanner with the correct programming to read this special system. Autozone, Advance, or Oreilys give free scans, but you should call ahead to ask if they have the correct scanner to read your Air-ride. The Diagnostic plug is useful but may not find all faults unless they are within the switches.
Be careful with the air pressure if you are attempting to remove any line or bag sensor because it has High pressure unless bled down. The vehicle body can shift on jacks if the Air-ride is not shut off when working under the vehicle.
There are some aftermarket firms which repair the bags and some Spring shops which remove the Factory system and put in regular springs. I hope you find my solution very helpful.
Unfortunately, it sounds like the air compressor for your air ride system is not working. But before you replace make sure that the height sensors haven't gone out which would bleed deflate the bags. SunCore Industries has about the best prices for the air compressor, dryer and air struts and bags.
Changing them is no picnic, but there is plenty of information at SunCore on step by step instructions to do it.
I have a 96 Mark VIII and have had to replace the rear bags and two height sensors and the air compressor so far, but when they work as designed they are a very smooth ride. A friend went with the replacement non-air ride and there is a big difference in how it rides.
I assume you mean the suspension air bags. They are an absolute nuisance......failure items include the compressor, eveling sensors (several) and the bags themselves. An easy and cheap fix is just to replace them with steel springs. The job should take about an hour and the springs will cost about $50 used from a savage yard, or you can get new ones at any auto parts store.
Jack the vehicle up and set on jack stands with both rear wheels off the ground. Perform the following one side at a time: Remove the rear wheel and tire, remove the shock absorber from the lower bracket. Remove the keeper pin at the top of the air bag that secures the bag to the frame bracket. Push down on the axle and pull the bag toward you. Unhook the air line and sensor wiring and tape them anywhere on the frame crossmember so they won't rattle. Push the new steeel spring up into the frame cavity and compress it enough to clear the spring pad on the axle and it will seat itself on the pad. Repeat the operation on the other side.
This solves the air bag probem permanently. The air suspension warning light will stay lit on the dash, and that can be turne off by removing a wire from the cowl connector. You will have to see tthe correct Ford Wiring manual for that vehicle to find which one to remove.
I have just competed the spring change as described above on my 98 Lincoln Navigator and the ride quality and load carrying capacity has not suffered.
Hi, those have air bags (air ride) and one or both of the air bags has a hole in it and is leaking out,they have a pump that fills them up with air but when the bag goes bad the pump will fill it,then it leaks out, and back and forth. you just need to replace the faulty suspension air bag. or e-bay sells kits to eliminate the air ride and replace with springs. good luck. yz-maniac....
Experienced problem after problem with my suspension on my 1990 LSC. Finally contacted "Strut Masters" online and replaced my entire system with a conversion for less than 400 and an afternoon. Installation was simple.
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