Lincoln Continental Air Suspension Fixes

The 1987 Lincoln Continental is a classic example of American luxury, and a key component of its renowned smooth ride was its advanced air suspension system. While these systems offered unparalleled comfort, they can, over time, develop issues that lead to a sagging ride height or uneven handling. If you're experiencing problems with your Lincoln's air suspension, understanding how it works and what can go wrong is the first step towards a successful repair. This guide will delve into the common culprits, diagnostic procedures, and repair methods for the air suspension on your 1987 Continental, aiming to get you back on the road in comfort and style.

Understanding the 1987 Lincoln Continental Air Suspension System

Before diving into repairs, it's essential to grasp the fundamental components of your Continental's air suspension. This sophisticated system typically comprises several key parts:

• Air Compressor: The heart of the system, this unit generates the pressurized air needed to inflate the air springs. It's usually located under the bonnet or in the boot area.
• Air Springs (Air Bags): These are rubber bellows filled with compressed air. They replace traditional coil springs and adjust their height based on the air pressure within them, thus controlling the vehicle's ride height.
• Air Lines: Flexible rubber or plastic hoses that transport the compressed air from the compressor to the air springs.
• Height Sensors: These sensors monitor the vehicle's ride height at each wheel and send signals to the control module.
• Control Module (ECU): The brain of the operation, this unit interprets signals from the height sensors and directs the compressor and valves to adjust air pressure as needed.
• Ride Height Valves: These valves regulate the flow of air into and out of the air springs, allowing for precise height adjustments.
• Air Reservoir: Some systems may include a small reservoir to store compressed air, allowing for quicker adjustments.

The system's goal is to maintain a consistent ride height regardless of passenger load or road conditions, providing a supremely comfortable and level experience. However, age and constant use can lead to wear and tear on these components.

Common Air Suspension Problems and Diagnosis

Several issues can plague an air suspension system. Identifying the symptom is crucial for pinpointing the faulty part:

Sagging Ride Height

This is the most common complaint. If one corner or the entire vehicle sags, especially after sitting for a period, it indicates a loss of air pressure. The usual suspects are:

• Leaking Air Springs: Over time, the rubber bellows of the air springs can crack or develop holes, allowing air to escape. This is often the primary cause of sagging.
• Leaking Air Lines: The hoses can become brittle, crack, or be damaged by road debris, leading to air leaks.
• Faulty Ride Height Valves: If a valve sticks open or closed, it can prevent proper inflation or deflation, leading to incorrect ride height or a constant leak.
• Compressor Issues: While less common for sagging, a weak compressor might struggle to maintain adequate pressure, especially if there are small leaks elsewhere.

Vehicle Not Lifting or Maintaining Height

If your Continental refuses to rise to its normal height or consistently drops after being inflated, consider these possibilities:

• Failed Air Compressor: The compressor may have simply given up the ghost, unable to build sufficient pressure.
• Leaking System: Even a small leak, if unaddressed, can overwhelm a struggling compressor.
• Electrical Issues: Problems with the control module, sensors, or wiring can prevent the system from functioning correctly.
• Blocked Air Lines: Debris or kinks in the air lines can restrict airflow.

Constant Compressor Running

If the air compressor runs continuously without shutting off, it's almost always a sign of a significant air leak. The compressor is trying to compensate for lost air, but if the leak is too large, it can't keep up, leading to overheating and premature failure of the compressor. Early detection of leaks is vital.

Warning Lights

Your Lincoln may have a dashboard warning light specifically for the air suspension. If this light is illuminated, it indicates a fault detected by the system's control module. The exact meaning of the light can vary, but it's a clear signal to investigate.

Diagnostic Steps for Your 1987 Continental

A systematic approach is best when diagnosing air suspension problems:

1. Visual Inspection

Start with a thorough visual check:

• Inspect all visible air lines for cracks, kinks, or signs of damage.
• Examine the air springs themselves for any obvious tears or punctures. You might need to jack up the vehicle (safely, using jack stands!) to get a good look underneath.
• Check the compressor for any physical damage or loose connections.

2. The Soapy Water Test

This is an effective method for pinpointing small air leaks:

1. Mix a generous amount of dish soap with water in a spray bottle.
2. With the system pressurized (you might need to run the compressor for a bit or let the car sit overnight if it’s only slightly sagging), spray the soapy water solution liberally over all air lines, connections, and the air springs.
3. Look for bubbles forming. Bubbles indicate a leak, as the escaping air will push the soapy water out.

3. Listening for Leaks

In a quiet environment, you might be able to hear a faint hissing sound if there's a significant leak. This is especially useful for checking connections.

4. Checking Compressor Operation

Listen to the compressor when the system is supposed to be active. Does it engage? Does it sound healthy, or is it strained and noisy? If it doesn't run at all, check the fuse and relay for the compressor. If it runs constantly, suspect a major leak.

5. Testing Ride Height Sensors and Valves

This often requires a multimeter and some knowledge of electrical testing. You'll need to consult a service manual for the specific resistance or voltage readings expected from the sensors and valves. Testing ride height valves can involve manually manipulating them to see if they seal correctly.

Repairing Your Air Suspension

Once you've identified the faulty component, the repair can proceed. The most common repairs involve replacing leaking parts.

Replacing Air Springs

This is a moderately difficult DIY job. The general process involves:

1. Safely lift and support the vehicle, ensuring the suspension is at its normal ride height or slightly compressed.
2. Disconnect the air line from the old air spring.
3. Carefully remove any retaining clips or bolts holding the air spring in place.
4. Compress the old air spring (if necessary, depending on the design) and remove it.
5. Install the new air spring, ensuring it's correctly seated and secured.
6. Reconnect the air line.
7. Lower the vehicle and allow the compressor to inflate the new air spring. Check for leaks.

Important: Always use high-quality replacement air springs designed specifically for your 1987 Lincoln Continental. Universal parts may not fit correctly or perform as expected.

Replacing Air Lines

If you find a damaged air line:

1. Ensure the system is depressurized.
2. Disconnect the faulty line at both ends.
3. Route the new line, ensuring it's secured properly and won't rub against any moving parts or sharp edges.
4. Connect the new line securely.

You can often purchase pre-formed air lines, which makes installation much easier. If you have to use bulk line, ensure you use the correct diameter and type of air suspension hose.

Replacing the Air Compressor

This is usually a more involved process:

1. Locate the compressor.
2. Disconnect the electrical connector and any air lines attached to it.
3. Unbolt the compressor from its mounting bracket.
4. Install the new compressor, reattaching all lines and electrical connections.

After replacing the compressor, you may need to bleed the system and allow the new unit to fill the air springs. Ensure the new compressor comes with the necessary seals or mounting hardware.

Replacing Ride Height Valves and Sensors

These repairs often require more specific diagnostic tools and can be more complex. Consult a service manual for detailed instructions on testing and replacement procedures. Incorrect installation of sensors can lead to the system not functioning at all or operating erratically.

When to Seek Professional Help

While many air suspension issues can be tackled by a determined DIY mechanic, some situations warrant professional attention:

• Complex Electrical Faults: If you suspect issues with the control module or intricate wiring, a specialist can diagnose these more efficiently.
• Lack of Confidence or Tools: Air suspension systems operate under pressure, and mistakes can be costly or dangerous. If you're not comfortable, leave it to the experts.
• Persistent Problems: If you've tried the common fixes and the problem persists, a professional mechanic will have the advanced diagnostic equipment to find the root cause.

A Note on Air Suspension Conversion Kits

For some classic vehicles, particularly those with aging and problematic air suspension, conversion kits are available that replace the air system with conventional coil springs. While this eliminates the complexity of air suspension, it also removes the unique comfort and ride quality that made the 1987 Continental so special. This is generally considered a last resort for those who want to avoid the ongoing maintenance of an air system.

Frequently Asked Questions (FAQs)

Q1: Can I drive my Lincoln Continental if it's sagging?
It's generally not recommended. Driving a vehicle with significantly sagging air suspension can put undue stress on other components, such as the CV joints and exhaust system, and can compromise steering and braking. It's best to address the issue promptly.

Q2: How much does it cost to repair air suspension?
Costs vary wildly depending on the specific problem and whether you DIY or use a professional. Replacing a single air spring can range from £200-£500 for parts and labour, while a new compressor could be £500-£1000+. Leaks in lines might be cheaper to fix.

Q3: How long do air springs last?
With proper maintenance and no leaks, air springs can last for many years and miles. However, they are a wear item, and exposure to road salt, debris, and extreme temperatures can accelerate degradation. Expect to replace them at some point in the vehicle's life.

Q4: Where can I find replacement parts?
Specialist automotive parts suppliers, online retailers focusing on suspension components, and Lincoln Continental enthusiast forums are excellent places to source genuine or high-quality aftermarket parts for your 1987 model.

Conclusion

The air suspension system on a 1987 Lincoln Continental is a marvel of automotive engineering that contributes significantly to its luxurious driving experience. While it requires more attention than conventional suspension, understanding its components and common failure points empowers you to diagnose and, in many cases, repair it yourself. By following a methodical diagnostic process and using the correct parts, you can restore your Continental's smooth, level ride and continue to enjoy this magnificent vehicle for years to come. Remember, safety first when working on any vehicle, especially when dealing with pressurized systems.