1991 Buick Regal Service and Repair Manual

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Factory-Grade Data

1991 Buick Regal service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Built for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and use wiring diagrams and system sections to diagnose problems faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical coverage with wiring diagrams
  • Coverage across key systems: engine, transmission, brakes, steering, suspension, HVAC, and more

Trims covered

  • Gran Sport Sedan 4-Door
  • Custom Coupe 2-Door
  • Limited Coupe 2-Door
  • Custom Sedan 4-Door
  • Limited Sedan 4-Door
  • Gran Sport Coupe 2-Door

Engines covered

  • 3.8L 3800CC 231Cu. In. V6 GAS OHV Naturally Aspirated
  • 3.1L 189Cu. In. V6 GAS OHV Naturally Aspirated

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

1991 Buick Regal Recalls & Complaints

NHTSA #95V15200008/08/1995Component: EXTERIOR LIGHTING

INCORRECT CLEAR FRONT SIDE MARKER BULBS WERE INSTALLED RATHER THAN AMBER BULBS. THIS DOES NOT CONFORM TO THE REQUIREMENTS OF FMVSS NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT."

Consequence

CONSEQUENCE OF NON-COMPLIANCE: DURING ILLUMINATION, THE BULBS WILL SHOW CLEAR RATHER THAN AMBER AND

Remedy

DEALERS WILL REPLACE THE CLEAR BULBS WITH THE CORRECT AMBER BULBS.

NHTSA #93V14500003/09/1993Component: FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS

THE FUEL FEED HOSE CAN PULL OUT OF THE CRIMPED COUPLING AT THE ENGINE END OF THE HOSE ASSEMBLY, CAUSING FUEL LEAKAGE.

Consequence

IF THE COUPLING WERE TO SEPARATE AND AN IGNITION SOURCEIS PRESENT, AN ENGINE COMPARTMENT FIRE COULD

Remedy

INSTALL A NEW FUEL FEED HOSE.

TSB #10246631

Expanded Availability for Remanufacture and Return (R&R) Electronic Control Modules

TSB #615073

SOME V6 ENGINES MAY, ON A VERY INFREQUENT BASIS, HAVE AN OIL ODOR CONDITION THAT IS GENERALLY ENCOUNTERED AFTER THE ENGINE'S OIL HAS BEEN CHANGED.TYPICALLY THE ODOR LASTS APPROXIMATELY 1000 MILES AFTER THE CHANGE OF OIL AND THEN DOES NOT RE

TSB #6088680

CUSTOMERS MAY COMPLAIN OF GRINDING / SCRAPING / GROANING NOISE FROM REAR SUSPENSION. *TT

TSB #51497

COLD START RATTLE NOISE (DIAGNOSIS/SERVICE PROCEDURE). *TW

TSB #50571

COLD START RATTLE NOISE. *TW

TSB #39308

COLD START RATTLE NOISE. *TW

TSB #39072

ABS WARNING LIGHT IS ON. *TW

TSB #39080

REAR STRUT RELATED THUMPING/SQUEAKING NOISE. *TW

Showing the 8 most recent of 9 technical service bulletins on file with NHTSA.

20140521Component: SEAT BELTSCrash reported1 injured

FEDERAL AUTHORITIES ARE INVESTIGATING WHETHER GENERAL MOTORS HID AN IGNITION SWITCH DEFECT WHEN IT FILED FOR BANKRUPTCY IN 2009,THE JUSTICE DEPARTMENT'S INVESTIGATION OF THE AUTOMAKER INCLUDES A PROBE

20140521Component: AIR BAGSCrash reported1 injured

FEDERAL AUTHORITIES ARE INVESTIGATING WHETHER GENERAL MOTORS HID AN IGNITION SWITCH DEFECT WHEN IT FILED FOR BANKRUPTCY IN 2009,THE JUSTICE DEPARTMENT'S INVESTIGATION OF THE AUTOMAKER INCLUDES A PROBE

20140521Component: POWER TRAINCrash reported1 injured

FEDERAL AUTHORITIES ARE INVESTIGATING WHETHER GENERAL MOTORS HID AN IGNITION SWITCH DEFECT WHEN IT FILED FOR BANKRUPTCY IN 2009,THE JUSTICE DEPARTMENT'S INVESTIGATION OF THE AUTOMAKER INCLUDES A PROBE

20140521Component: STRUCTURECrash reported1 injured

FEDERAL AUTHORITIES ARE INVESTIGATING WHETHER GENERAL MOTORS HID AN IGNITION SWITCH DEFECT WHEN IT FILED FOR BANKRUPTCY IN 2009,THE JUSTICE DEPARTMENT'S INVESTIGATION OF THE AUTOMAKER INCLUDES A PROBE

20011106Component: VISIBILITY:WINDSHIELD WIPER/WASHER:SWITCH/WIRINGCrash reported1 injured

WHILE DRIVING DRIVER'S SEAT BROKE AND COLLAPSED BACKWARDS WHEN IMPACTED WITH ANOTHER VEHICLE THAT RAN STOP SIGN. DRIVER SUFFERED SHOULDER INJURY, BUT NO EMERGENCY ROOM TREATMENT.*AK

Showing the 5 most serious of 303 complaints filed with NHTSA.

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