1986 Jeep Comanche Service and Repair Manual

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Factory-Grade Data

1986 Jeep Comanche 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.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

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

Trims covered

  • XLS Standard Cab Pickup 2-Door
  • Custom Standard Cab Pickup 2-Door
  • X Standard Cab Pickup 2-Door

Engines covered

  • 2.8L 173Cu. In. V6 GAS OHV Naturally Aspirated
  • 2.5L 150Cu. In. l4 GAS OHV Naturally Aspirated
  • 2.1L 126Cu. In. l4 DIESEL SOHC Turbocharged

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 Jeep Comanche Recalls & Complaints

NHTSA #85V13900029/10/1985Component: FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS

JEEPS MAY HAVE AN IMPROPERLY CONNECTED FUEL LINE FITTING WHICH COULD BECOME DISCONNECTED AND CAUSE GASOLINE TO BE SPILLED.

Remedy

RECONNECT FUEL LINE FITTING, AS REQUIRED.

NHTSA #86V03100025/02/1986Component: EQUIPMENT:OTHER:LABELS

GROSS WEIGHT RATINGS AND TIRE PRESSURES INFORMATION ON THE CERTIFICATION LABEL ARE INCORRECT, THESE DO NOT COMPLY TO FEDERAL REGULATION PART 567.

Remedy

REPLACEMENT LABELS WITH CORRECT INFORMATION WILL BE MAILED TO OWNERS.

NHTSA #86V14700014/11/1986Component: PARKING BRAKE

PARK BRAKE ASSEMBLY PAWL MAY BE IMPROPERLY HARDENED. CONSEQUENCE OF DEFECT: PAWL COULD YIELD UNDER LOAD RESULTING

Remedy

REPLACE PARK BRAKE ASSEMBLIES.

NHTSA #86V15900009/12/1986Component: STEERING:LINKAGES

STEERING LINKAGE COUPLERS REMAINED IN ACID ETCHING BATH TOO LONG.

Remedy

REPLACE OUT OF TOLERANCE STEERING LINKAGE COUPLERS.

NHTSA #86V14600007/11/1986Component: VEHICLE SPEED CONTROL:CABLES

ACCELERATOR CABLE BUSHING COULD DISCONNECT FROM THE ACCELERATOR LEVER ASSEMBLY.

Remedy

REPLACE ACCELERATOR PEDAL BRACKET AND LEVER ASSEMBLIES.

NHTSA #88V10600001/07/1988Component: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC

BRAKE BOOSTER VACUUM RESERVOIR CANISTERS MAY DEVELOP LEAKS DUE TO BUMPER IMPACT.

Consequence

THIS WOULD RESULT IN LOSS OF POWER BRAKE ASSIST AND ANINCREASE IN STOPPING DISTANCE.

Remedy

REPLACE BRAKE BOOSTER VACUUM CANNISTERS WITH NEW TYPE CANNISTERS; ALSO, INSTALL A RESTRICTION ORIFIC

No service bulletins No technical service bulletins on file with NHTSA for the 1986 Jeep Comanche.
20031124Component: ENGINE AND ENGINE COOLING:ENGINE

ENGINE KNOCKS , BEARINGS BAD. *LA

20031124Component: SUSPENSION:FRONT:WHEEL BEARING

ENGINE KNOCKS , BEARINGS BAD. *LA

19980210Component: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE

VEHICLE CONTINUOUSLY STALLS, SEVERAL REPAIRS MADE AND STALLING STILL OCCURRS.

19980119Component: EQUIPMENT:MECHANICAL:CARRIER/RACK

CABLE THAT SUPPORTS SPARE TIRE UNDER BED OF PICKUP IS CORRODED AND FAILED. SPARE TIRE DROPPED INTO INTERSECTION AND NEARLY CAUSED A CRASH.

19961221Component: SEAT BELTS:FRONT:BUCKLE ASSEMBLY

PURCHASED JEEP USED, SEAT BELT BUCKLES INOPERATIVE. *AK

Showing the 5 most serious of 7 complaints filed with NHTSA.

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