The 1991 Mazda Miata (chassis code NA) represents a modern interpretation of the classic British roadster, offering a lightweight, rear-wheel-drive, two-seater convertible experience. This vehicle embodies pure driving enjoyment with its agile handling, near-perfect 50/50 weight distribution, and iconic pop-up headlights. Powered by a 1.6-liter DOHC inline-4 engine producing 115 horsepower, the Miata was celebrated for its accessible entry into sports car ownership and its renowned reliability, earning a spot on '10Best' lists for multiple years. Its design philosophy, inspired by vehicles like the Lotus Elan, has ensured its timeless appeal and status as an automotive icon that revitalized the affordable sports car market. This comprehensive factory service manual provides complete repair and maintenance information for the 1991 Mazda Miata. It covers all mechanical and electrical systems, including detailed engine overhaul procedures for the 1.6L B6ZE engine, transmission service for both manual and automatic options, suspension, brakes, steering, and drivetrain components. The manual also details electrical system diagnostics, including wiring diagrams and OBD-I trouble codes, as well as body and chassis repairs, and climate control servicing. With step-by-step instructions, torque specifications, and factory maintenance schedules, this manual is an indispensable resource for owners and technicians seeking to maintain, diagnose, and repair their vehicle with accuracy and confidence. 🏷️ Basic Information Identification Make: Mazda Model: Miata Year: 1991 Chassis Code: NA Codes OBD System Coverage: OBD-I (On-Board Diagnostics I) 👋 Introduction Market Position Vehicle Class: Lightweight, rear-wheel-drive, two-seater sports convertible. Philosophy: Embodied the spirit of the classic British roadster, offering pure driving enjoyment at an accessible price point. Competitive Analysis Competitors 1991: Ford Capri, Toyota MR2, Fiat Spider, Alfa Romeo Spider. Key Features Design: Lightweight construction, excellent weight distribution (near 50/50), pop-up headlights, agile handling. Value Proposition: Affordable entry into sports car ownership, renowned for reliability and driving fun. 📋 Manual Details Coverage Areas General Coverage: Complete factory service and repair Mechanical Systems: Engine overhaul, brakes, timing belt, suspension, transmission, air conditioning, U-joints, CV-joints, front end alignment Electrical Systems: Wiring diagrams, trouble codes, computer diagnostic trouble tree charts Body And Chassis: Sunroof Maintenance: Factory maintenance schedules and charts, driving concerns, serpentine belt routings Page Count Estimated Pages: Estimated 1000+ pages (typical for a comprehensive factory service manual of this era) Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul and rebuilding procedures for the 1.6L DOHC inline-4 engine. Engine Performance: Detailed analysis of engine performance, including tuning and diagnostics. Fuel System: Coverage of fuel injection system components, diagnostics, and repair. Cooling System: Radiator, fan, thermostat, coolant flow, and associated components. Lubrication System: Oil pump, oil filter, oil pan, and lubrication passages. Ignition System: Ignition coils, spark plugs, ignition control module, and timing. Exhaust System: Manifold, catalytic converter, mufflers, and piping. Transmission Manual: Removal, installation, in-car servicing, and complete overhaul procedures for the 5-speed manual transmission. Transmission Automatic: Coverage for automatic transmission models if equipped, including removal, installation, and servicing. Drivetrain: Propeller shaft, differential, axle shafts, U-joints, and CV-joints. Suspension Front: Double wishbone, shock absorbers, springs, anti-roll bar, ball joints, and alignment specifications. Suspension Rear: Multi-link independent suspension, shock absorbers, springs, and trailing arms. Steering System: Steering rack, tie rods, steering column, and power steering system (if applicable). Brake System: Front disc brakes, rear disc brakes (typical for Miata), calipers, rotors, pads, master cylinder, brake lines, and bleeding procedures. Wheel And Tires: Tire specifications, wheel bolt patterns, and mounting procedures. Body Exterior: Body panel removal and installation, bumper components, fenders, hood, trunk lid. Body Interior: Dashboard, seats, door panels, carpeting, and trim. Sunroof: Specific service and repair procedures for the manual or power sunroof. Climate Control: Air conditioning system service, capacities, refrigerant types, and component testing. Electrical Power Distribution: Battery, alternator, starter motor, and charging system. Lighting System: Headlights, taillights, interior lighting, and signal lights. Instrumentation: Gauges, warning lights, and instrument cluster diagnostics. Chassis Electrical: Horn, wipers, washer system, power windows (if equipped). Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks, spark plug replacement, belt inspections. Engine Repair: Complete engine rebuild, head gasket replacement, piston ring replacement, valve service. Timing Belt Service: Specific step-by-step procedures for timing belt replacement, including tensioner and water pump recommendations. Brake Repair: Pad replacement, rotor resurfacing/replacement, caliper overhaul, brake line repair. Suspension Service: Component replacement (shocks, struts, bushings, ball joints), alignment procedures. Transmission Service: Fluid changes, clutch replacement, transmission overhaul. Electrical Troubleshooting: Diagnostic procedures for electrical faults using wiring diagrams and trouble codes. Ac Service: Recharging, leak detection, component replacement, evacuation. Drivetrain Service: U-joint replacement, CV-joint boot replacement and repair. Diagnostic Charts: Computer diagnostic trouble tree charts for systematic fault finding. Torque Specifications: Comprehensive list of all critical torque specifications for engine, chassis, and suspension components. Wiring Diagrams: Detailed, high-quality wiring diagrams for all electrical systems. Vacuum Diagrams: Detailed...