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1991 Buick Roadmaster Problems: 1 Known Issue

1991 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1991 Buick Roadmaster has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. Across all issues with published estimates, repair costs range from $250 to $800. DIY maintenance guides at au7o.io.

In This Article

  • Roadmaster Suspension1
  • Recalls12
  • FAQ
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In This Article

  • Suspension1
  • Recalls12
  • FAQ

All 1 Known Issue

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ALL YEARS199619951994199319921991

On the 1991-1996 Buick Roadmaster, the Roadmaster Estate Wagon (and some sedans equipped with the F41 package) uses an Electronic Level Control (ELC) system with rear air-adjustable shocks (GM PN 22064630), a height sensor under the driver's side rear seat, and a hood-mounted air compressor. The rubber air bladders on the shocks crack and leak with age, the connector wiring under the body corrodes and breaks, and the height sensor fails — all of which cause the compressor to run continuously (sometimes after engine shutoff), pumping the rear of the car so high that ride and handling are ruined, or leaving the rear sagging. The original PN 22064630 shock is discontinued, complicating repair.

Common Symptoms

  • Rear of vehicle sagging or sitting too high
  • Air compressor runs continuously or cycles every few minutes
  • Compressor continues running after engine is shut off
  • Harsh, bouncy ride with poor handling when over-inflated
  • Audible air leak from rear shocks
  • Broken wiring at connector under driver-side rear seat

How to Fix

Diagnose first: inspect the height sensor wiring under the driver-side rear seat for broken/corroded wires, test the sensor, and check the air lines for leaks at the shock fittings. If the shocks themselves leak, the most common modern fix is a conversion kit (Strutmasters CADR3 or similar) that replaces the air shocks with passive gas shocks and either deletes the air system or splits compressor output to aftermarket air bags via a T-fitting. Replace the compressor relay or compressor if it sticks on. Many owners simply unplug the compressor and run conventional shocks to eliminate the system entirely.

Typical repair cost:$250 - $800

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Jun 2026
NHTSA Recalls12 recalls

EQUIPMENT

CERTAIN HONEYWELL FRAM RACING BRAND HP4 AND HP8 OIL FILTERS THAT WERE MANUFACTURED FROM MAY 25, 2006, THROUGH SEPTEMBER 14, 2007, AND SOLD FOR USE AS REPLACEMENT EQUIPMENT FOR VEHICLES LIST ABOVE. THE AFFECTED FILTERS ARE MARKED WITH A DATE CODE A61451 THROUGH A72571 SEQUENTIALLY. THE DATE CODE AND PART NUMBER APPEAR ON THE FILTER HOUSING. FRAM RACING HP4 AND HP8 OIL FILTERS NOT BEARING A DATE CODE IN THIS RANGE ARE NOT AFFECTED BY THIS RECALL. THE GASKET OF THE OIL FILTER BECOMES MORE PLIABLE UNDER HIGH TEMPERATURES AND PRESSURES.

Campaign #07E08800024/10/2007

WHEELS:LUGS/NUTS/BOLTS/STUDS

PAINT ON THE WHEEL MOUNTING SURFACES CAN ACT AS A SHIM BETWEEN THE WHEEL AND THE ROTOR/DRUM. AS THE VEHICLE IS DRIVEN, THE WHEEL IMBEDS INTO THE PAINT, LOOSENING THE LUG NUT AND CAUSING A LOSS OF CLAMP LOAD.

Campaign #94V07600016/04/1994

ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS

THE ENGINE OIL COOLER INLET HOSE MAY HAVE BEEN INSTALLED TOO CLOSE TO THE STEERING GEAR CAUSING CHAFING. THE CHAFING CAN EVENTUALLY WEAR THROUGH THE HOSE'S PROTECTIVE SLEEVE RESULTING IN ENGINE OIL LEAKING ONTO THE ENGINE.

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Frequently Asked Questions

What are the most common Buick Roadmaster problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1991 Buick Roadmaster has 1 documented issue. The documented issue is: Estate Wagon Rear Self-Leveling Air Shock and Compressor Failure. None are rated critical, but regular maintenance is recommended.

Is the Buick Roadmaster reliable?

The 1991 Buick Roadmaster has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Buick Roadmaster problems?

Repair costs for known Buick Roadmaster issues range from $250 to $800, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 1991-1996 Buick Roadmaster Estate Wagon Rear Self-Leveling Air Shock and Compressor Failure?

The Roadmaster Estate Wagon (and some sedans equipped with the F41 package) uses an Electronic Level Control (ELC) system with rear air-adjustable shocks (GM PN 22064630), a height sensor under the driver's side rear seat, and a hood-mounted air compressor. The rubber air bladder… Repairs typically run $250-$800. Severity: medium.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

Campaign #94V04900021/03/1994

FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:MOUNTING

THE FUEL TANK ATTACHMENT STRAP FASTENERS WERE NOT PROPERLY TIGHTENED. THE FASTENERS CAN COMPLETELY DETACH, EVENTUALLY ALLOWING THE FUEL TANK TO SAG AND THE BOTTOM OF THE TANK TO STRIKE THE ROADWAY.

Campaign #94V21000025/10/1994

VEHICLE SPEED CONTROL:SPRINGS

THESE VEHICLES FAIL TO CONFORM TO FMVSS NO. 124, "ACCELERATOR CONTROL SYSTEMS." AT LOW TEMPERATURES, EXCESSIVE FRICTION CAN OCCUR IN THE ACCELERATOR PEDAL ASSEMBLY.

Campaign #95V08200024/04/1995

+ 7 more recalls. Check all on NHTSA.gov

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