EAS (Electronic Air Systems) on the LWB Range Rover Classic, the P-38 Range Rover, and on the rear of the Discovery II--are complex systems that seem to behave up until about 60-75K miles of usage. More often that not, it is necessary to have a Land Rover repair facility with a scanner (they cost about $15K) plug into your vehicle and extract the fault codes that are stored. There are many electrical/pneumatic parts to the system. The Compressor, Valve Block/Driver, Ride Height Sensors, and Air Springs themself are all available from eurotek apg. The Air Springs develop fine cracks that ultimately cause the component to not hold pressure and they must be replaced. A Compressor fighting to maintain pressure will be overworked and fail. We have seen many cases where one of the four ride height sensors has failed and the repair is rather straightforward. If the accumulating cost of replacing marginal components gets excessive, you may want to convert to a coil spring system. On the Discovery II model, this is required on the rear only. We supply the kits for this purpose.
The standard shocks are good for about 60K miles under normal operating conditions. We can supply the replacement Shock, but recommend fitting Bilstein units as a upgrade that is well worth the cost in better performance and longer life. It should be said that new Shocks and Springs will not guarantee a return to a tight handling vehicle if the suspension bushings are worn out. The Radius arms, Panhard Rod(s), and Trailing arms all have rubber bushings that simply wear out over time. The vehicle design is such that slop in any of these locations contributes to a "looseness" easily felt on such a heavy vehicle with-- a relatively high center of gravity. To restore the "soft" road-dampening drive quality to your Land Rover, fit the as-stock specification bushings. There are also three grades of poly bushings (Blue,orange,and red) that are available in kit form from eurotek apg. If your model is fitted with anti-sway bars, we also recommend changing the bushings at this location to Poly ones. Blue is firmer than stock, but still adequate for street use. Orange bushings are more dense than the Blue and transmit more road-induced resonance. The Red bushings are typically used for off-road use only. In any case, the longevity of these Poly bushings means you will not have to replace them again for a long time.
While we are not in the business of supplying parts to drastically change the ride height and subsequent suspension geometry of your Land Rover (There are many Specialists- on-line- both sides of the pond that cater to this market), we do have Coil Springs available that will yield a small rise in ride height--- if desired. A Land Rover is a little different Beast in requiring Springs with different lengths (free-height) on the corners to compensate for the axial off-set of the drivetrain. By all means replace your Springs when the miles pile up-- as they are like any other component and have a life-cycle.
Unusual "pops" heard when turning on slow corners has been traced to the "dog-bone" sway bar links on the Range Rover. Also check the radius arm bushings as mentioned earlier.
