1986 Oldsmobile 98 Service and Repair Manual

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Factory-Grade Data

1986 Oldsmobile 98 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

  • Regency Brougham Sedan 4-Door
  • Regency Sedan 4-Door
  • Regency Brougham Sedan 2-Door
  • Regency Sedan 2-Door

Engines covered

  • 3.8L 3800CC 231Cu. 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

1986 Oldsmobile 98 Recalls & Complaints

NHTSA #86V14500003/11/1986Component: STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS

THERE MAY NOT BE ENOUGH CLEARANCE BETWEEN THE POWER STEERING PUMP RETURN HOSE AND THE ENGINE EXHAUST MANIFOLD.

Remedy

REPLACE AND CORRECTLY ROUTE HOSE, AS NECESSARY.

No service bulletins No technical service bulletins on file with NHTSA for the 1986 Oldsmobile 98.
20080102Component: SUSPENSION

TL*THE CONTACT OWNS A 1986 OLDSMOBILE 98. THE CONTACT STATED THAT HE BOUGHT AFTER-MARKET BALL JOINTS (MODEL # FA1478) FOR A ROUTINE REPLACEMENT. AS A RESULT, THE VEHICLE FAILED THE STATE SAFETY INSP

20031001Component: SERVICE BRAKES, HYDRAULIC

BRAKES DO NOT WORK PROPERLY, THEY FELT VERY SPONGY IN THE MORNING. *AK THE BRAKES WERE FIXED AND REMAINED INOPERATIVE WHEN FIRST STARTED IN THE MORNING. *SCC *JB

19980205Component: SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED

WHEN COMING TO A STOP THE ABS SYSTEM FAILED, RESULTING IN EXTENDED STOPPING DISTANCE. THE DEALER HAS BEEN CONTACTED. *AK

19970807Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, A

BRAKE LINE (HOSE) BROKE, CAUSING BRAKE FAILURE.

19961002Component: ELECTRICAL SYSTEM:IGNITION

WHILE DRIVING VEHICLE WOULD STOP WHILE TURNING CORNERS OR WHILE GOING DOWN THE ROAD, WOULD LOSE POWER COMPLETELY, VEHICLE WOULD ALSO JERK, THIS IS AN INTERMITTENT PROBLEM. *AK

Showing the 5 most serious of 13 complaints filed with NHTSA.

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