🏷️ Basic Information

Make:

GMC

Model:

Jimmy

Year:

1986

Model Code:

K5/K1500 Blazer (though the product refers to Jimmy, GMC often used Blazer nomenclature for 4WD equivalents)

Generation:

Third Generation (1973-1991) - Specifically the updated styling and mechanicals of the later half of this generation.

👋 Introduction

Market Position:

The 1986 GMC Jimmy was a popular full-size sport utility vehicle (SUV), competing with models like the Chevrolet K5 Blazer, Ford Bronco, and Dodge Ramcharger. It appealed to buyers seeking ruggedness, off-road capability, and utility for towing and cargo. This manual positions itself as the definitive resource for owners and independent repair shops aiming for dealership-level repair accuracy.

Target Audience:

Owners of 1986 GMC Jimmys, independent repair shops, automotive technicians, and restoration enthusiasts looking for authentic, factory-quality repair information.

Competitive Analysis:

In 1986, the SUV market was maturing, with the Jimmy offering a blend of truck-based utility and passenger vehicle comfort. Competitors focused on similar attributes, but GMC's reputation for robust powertrains and comfortable interiors gave it a strong standing. This manual is crucial for maintaining the integrity and performance of these vehicles.

Key Features:

Vehicle-specific, factory-authorized content, comprehensive A-Z coverage, detailed step-by-step instructions, high-quality diagrams and illustrations, wiring schematics, digital format for easy access and printing, compatibility with various operating systems.

📋 Manual Details

Coverage Areas:

All models & all repairs A-Z, including maintenance, engine, control systems, mechanical components, fuel service, emissions, cooling, lubrication, ignition, starting, charging, automatic transmissions, clutches, manual transmissions, transfer cases, propeller shafts, drive shafts, differentials, axles, suspension, tires, wheels, brake control, brakes, parking brakes, steering columns, power steering, air conditioning, supplemental restraint systems, seat belts, engine immobilizers, cruise control, wipers, washers, door locks, meters, audio/visual systems, horns, windshields, glass, mirrors, instrument panels, seats, engine hoods, doors, exterior and interior components, electrical systems, multiplex/CAN communication.

Page Count:

Not explicitly stated in product information, but implied to be comprehensive covering all A-Z repairs.

Manual Type:

Factory Service and Repair Manual

Language:

English

Format:

Digital (PDF), Printable

Compatible Os:

Windows Vista (32 and 64-bit), XP, ME, 98, NT, 2000, and Mac compatible.

Accessibility:

Easy to use, searchable PDF allows users to print only necessary pages and blow up images for detail.

📖 Manual Coverage

Systems Covered:

Comprehensive coverage of all major vehicle systems including powertrain (engine, transmission, drivetrain), chassis (suspension, steering, brakes), electrical system (starting, charging, ignition, accessories, lighting), HVAC, body and interior. Specific mention of advanced electronic systems for the era like cruise control and potential early multiplex communication systems.

Emission Control Systems:

Detailed information on emission control components such as catalytic converters, EGR valves, and PCV systems, along with diagnostic and repair procedures for meeting emissions standards of the era.

Procedures Included:

Step-by-step repair instructions, diagnostic procedures, maintenance schedules, component removal and installation, adjustments, troubleshooting, wiring schematics, illustrations, and detailed specifications.

Diagnostics Included:

Diagnostic flowcharts, troubleshooting guides for common symptoms, ignition system testing, fuel system pressure testing, electrical circuit diagnosis using multimeter and wiring diagrams.

Technical Depth:

Factory-level detail, equivalent to that used by dealership technicians. Covers everything from routine maintenance and fluid changes to complex diagnostics, component overhauls, and electrical system troubleshooting. Includes detailed diagrams and schematics for accurate repairs.

Electrical Diagnostics Depth:

Extremely detailed electrical schematics covering all circuits, component locations, and diagnostic troubleshooting procedures for the entire electrical system.

📊 Manual Specifications

File Format:

PDF

Print Quality:

High-resolution, printable pages with clear text and diagrams. Images can be blown up for larger views.

Binding Type:

Digital (no physical binding)

Paper Type:

N/A (Digital Format)

Requirements:

Adobe PDF Reader and Winzip (or similar decompression utility) are required, both are available free online.

⚙️ Engine Specifications

Primary Engine:

4.3L (262 cu in) V6 'Vortec' (LG2 code)

Horsepower:

Approx. 160-165 hp @ 4000 rpm (factory spec varies slightly by configuration)

Torque:

Approx. 230-235 lb-ft @ 2000 rpm (factory spec varies slightly by configuration)

Fuel System:

Throttle Body Injection (TBI) for the 4.3L V6. Carbureted options (e.g., 305 V8) may have been available in certain configurations, but TBI was becoming standard for efficiency and emissions.

Fuel Pressure Tbi:

Typical TBI fuel pressure specification for GM vehicles of this era is in the range of 9-13 psi. Manual will provide exact spec.

Engine Options:

Likely included the 5.0L (305 cu in) V8 and potentially the 5.7L (350 cu in) V8 engine in some configurations. The 4.3L V6 was a very common and capable powerplant for this model.

Engine Codes:

LG2 (4.3L V6 TBI), L03 (5.0L V8 TBI), L05 (5.7L V8 TBI) - verify based on specific VIN.

Ignition System:

Electronic Ignition (HEI - High Energy Ignition) system, typically with a distributor.

Cooling System:

Pressurized system with engine-driven fan, typically a 4-row or 5-row radiator depending on engine and option package.

Engine Block Material:

Cast Iron

Cylinder Head Material:

Cast Iron

🔧 Transmission

Standard:

GM TH700-R4 (4-speed automatic)

Optional:

Manual transmissions (e.g., SM465 4-speed heavy-duty, NV4500 5-speed if introduced early) and a New Process NP208 transfer case for 4WD models were common options.

Features:

The TH700-R4 provided a significant overdrive gear for improved fuel economy on the highway. Transfer case options allowed for 2WD, 4WD High, and 4WD Low range operation.

Transmission Fluid Capacity:

TH700-R4: Approximately 12-13 quarts (dry fill) / 5-6 quarts (pan drop and fill). Verify with manual.

📐 Dimensions

Wheelbase:

106.5 inches (2705 mm) for the standard wheelbase K10/K1500 chassis.

Overall Length:

Approx. 175-180 inches (4445-4572 mm) depending on body style (e.g., with removable top).

Overall Width:

Approx. 79.4 inches (2017 mm).

Ground Clearance:

Varies by tire size and suspension, but generally significant for off-road capability, typically over 8 inches.

Curb Weight:

Approx. 4,200 - 4,800 lbs (1905 - 2177 kg) depending on engine and options.

Gross Vehicle Weight Rating:

GVWR typically ranged from 6,000 lbs to 6,500 lbs.

Towing Capacity:

Varies significantly by engine, axle ratio, and chassis configuration, but typically rated for towing between 5,000 to 7,000 lbs.

Seating Capacity:

Typically seats 4-6 occupants, depending on configuration (front bucket seats with console, or bench seat).

🛡️ Safety Features

Crash Test Ratings:

As an older vehicle, formal NHTSA or IIHS crash test data for this specific 1986 model year is not readily available in modern formats. However, the robust body-on-frame construction provided a degree of inherent structural integrity.

Active Features:

Four-wheel drive (optional), anti-lock brakes (ABS) might have been an option on some later 1986 models or specifically on heavier duty variants, power steering.

Passive Features:

Lap and shoulder belts, reinforced door beams, potentially padded interior surfaces. Supplemental Restraint System (SRS) for airbags was not standard or widely available in 1986 SUVs.

Rollover Protection:

The removable 'top' on some Jimmy models (especially 2-door versions) meant structural integrity was primarily in the fixed cab structure and pillars. This manual would detail any specific reinforcement or inspection points related to this.

💡 Technology Features

Infotainment System:

Basic AM/FM radio with cassette player was common. Optional premium sound systems were available. HVAC controls were typically manual sliders or rotary knobs. No digital displays or touchscreens.

Driver Assistance:

Cruise control was an optional feature. ABS was becoming available on some GM vehicles by this year, but likely not standard on most Jimmy models.

Connectivity:

No modern connectivity features like Bluetooth or USB. Analog gauges and controls dominated the dashboard.

Electrical Features:

Power windows, power locks, and intermittent wipers were available as options on higher trim levels. Basic lighting systems, including sealed beam headlights, were standard.

🔧 Maintenance

Oil Change Interval:

Typically every 3,000 to 5,000 miles or 3 to 6 months, depending on driving conditions and oil type used. Refer to manual for specific recommendations based on oil viscosity.

Transmission Fluid Change:

Recommended every 30,000 to 60,000 miles for automatic transmissions, or as specified by GM for the TH700-R4. Filter changes often recommended concurrently.

Transfer Case Fluid Interval:

Recommended check/change every 30,000 to 50,000 miles, depending on use (especially off-road). Refer to manual for specific type (e.g., Dexron II or similar) and capacity.

Engine Oil:

API SF or SG service classification, viscosity grade typically 10W-30 or 10W-40, depending on ambient temperature. Check manual for exact specs.

Transmission Fluid:

Dexron II (or equivalent) for TH700-R4 automatic transmission. Manual transmission fluid (e.g., GL-4 80W-90) for manual gearboxes.

Coolant:

Ethylene Glycol based antifreeze. Typically a 50/50 mixture with distilled water. Check manual for specific type and capacity. GM may have specified specific coolant formulations for their engines.

Power Steering Fluid:

GM Power Steering Fluid (PSF) or Dexron II (or equivalent) for hydraulic power steering systems.

Common Issues:

Common issues for this era include carburetor or TBI fuel delivery problems, ignition system wear (especially the HEI module), exhaust manifold leaks, differential pinion seal leaks, U-joint wear, and rust (particularly in rocker panels and floorboards). Automatic transmission shifting issues can also arise with age and mileage.

Oil Filter Part Number:

Examples: AC Delco PF2, Fram PH8A, Wix 51085 (verify exact fitment).

Air Filter Part Number:

Examples: AC Delco A384C, Fram CA140 / CA2066 (verify exact fitment).

📚 Vehicle History

Brand Heritage:

GMC has a long history of producing robust trucks and utilitarian vehicles. The Jimmy nameplate, shared with Chevrolet's K5 Blazer, represents a significant part of GM's legacy in the SUV market, emphasizing durability and capability.

Gmc Brand Identity:

GMC has always positioned itself as 'Professional Grade,' implying a focus on durability, capability, and commercial-grade features, even in its consumer vehicles like the Jimmy.

Model Evolution:

The 1986 Jimmy represented the third generation of the full-size Jimmy (which shared its platform with the Chevrolet K5 Blazer). This generation, introduced in 1973, saw significant updates over its long run, including aerodynamic improvements and powertrain advancements like the TBI fuel injection for 1985/1986.

Styling Updates For 1986:

The 1986 model year saw minor styling refreshes, including updated grille designs, bumper treatments, and potentially new interior trim options. The move to TBI fuel injection on many engines was a significant functional update for efficiency and emissions.

Production Locations:

General Motors assembly plants in North America, most notably Janesville, Wisconsin (historically a primary GM truck/SUV plant).

Production Years:

Full-size Jimmy: 1970-1991. This manual specifically covers the 1986 model year within this generation.