🏷️ Basic Information Identification Make: Mazda Model: MX-5 Miata Generation: NA (First Generation) Codes Chassis Code: NA Engine Code: B630 (1.6L), BP (1.8L - later models) 👋 Introduction Market Position Original Market: Affordable, lightweight, rear-wheel-drive sports car targeting enthusiasts seeking pure driving pleasure. Competitive Analysis Key Competitors: Alfa Romeo Spider, Fiat Spider, Datsun Z-cars (earlier models), Triumph Spitfire (historically), MGB (historically). Key Features Driving Dynamics: Renowned for its balanced chassis, lightweight construction, and communicative steering, offering exceptional handling and driver feedback. Design Philosophy: Simple, elegant, and driver-focused design, often drawing parallels to classic British roadsters. Manual Value Proposition Utility: Indispensable tool for owners and technicians needing to accurately identify, order, and replace parts for the iconic 1990 Miata. 📋 Manual Details Coverage Areas Primary Focus: Parts identification and procurement for 1990 Mazda MX-5 Miata Component Scope: All mechanical, electrical, body, and interior components Page Count Estimated Pages: 500-700 (typical for comprehensive parts catalogs of this era) Manual Type Type: Parts Catalog / Parts Manual Language Language: English Format Format: Digital (likely PDF, historically printed) 📖 Manual Coverage Systems Covered Powertrain: Engine assembly, fuel system, cooling system, exhaust system, clutch assembly Drivetrain: Transmission, driveshafts, differential, rear axle components Chassis: Suspension (front and rear), steering system, braking system (front and rear disc) Electrical: Wiring harnesses, lighting (headlights, taillights, interior), ignition system, starting system, charging system, instruments, audio system Body Exterior: Body panels (hood, fenders, doors, trunk lid), bumpers, convertible top frame, glass, seals, trim, wheels, tires Body Interior: Dashboard, seats, carpeting, door panels, steering wheel, shift lever, HVAC components, seat belts Procedures Included Part Identification: Detailed exploded diagrams with corresponding manufacturer part numbers for every component Assembly Overview: Visual guides for understanding how components are assembled within larger systems Repair Reference: Implicit reference for part sourcing during repair and maintenance tasks Technical Depth Depth: Highly detailed for part identification and cataloging; does not typically include step-by-step repair procedures or torque specifications (these are usually found in a separate service manual). 📊 Manual Specifications File Format Digital Format: PDF (Portable Document Format) - likely OCR'd for searchability Print Quality Diagram Clarity: Professional quality, allowing enlargement for clear visibility of small parts and fastener details Binding Type Original Binding: Typically a sturdy spiral-bound or perfect-bound booklet for printed versions Paper Type Original Paper: Heavyweight, glossy paper suitable for detailed technical illustrations ⚙️ Engine Specifications Primary Engine Engine Type: Inline 4-cylinder, DOHC, 16-valve Displacement: 1.6 Liters (1597 cc) Bore X Stroke: 83.0 mm x 74.2 mm Performance Horsepower: 115 hp @ 6500 rpm (North American Spec) Torque: 100 lb-ft @ 5000 rpm (North American Spec) Fuel System Injection Type: Electronic Fuel Injection (EFI) Fuel Requirement: Premium Unleaded Gasoline (91 Octane or higher recommended) Lubrication Oil Capacity: 4.2 US Quarts (4.0 Liters) with filter change Recommended Oil Viscosity: 10W-30 or 5W-30 (depending on climate) 🔧 Transmission Standard Transmission Type: 5-speed Manual Optional Transmission Type: 4-speed Automatic (less common, often affects performance) Features Gear Ratios Manual: Refer to specific manual sections for exact ratios by gear; typically close-ratio for sporty feel. Transmission Fluid Type: GL-4 Gear Oil (e.g., 75W-90 or 80W-90) 📐 Dimensions Exterior Length: 155.7 inches (3955 mm) Width: 66.1 inches (1680 mm) Height: 48.8 inches (1240 mm) to top of windshield Wheelbase: 89.2 inches (2265 mm) Weights Curb Weight: Approx. 2,299 lbs (1043 kg) for manual transmission models Gross Vehicle Weight Rating: Approx. 3,000 lbs (1361 kg) 🛡️ Safety Features Ratings NHTSA Front Crash Rating: Not officially rated under current NHTSA methodology for this model year. Active Features Braking System: Front: Ventilated Discs, Rear: Solid Discs Parking Brake: Mechanical, rear caliper type Passive Features Airbags: Driver-side airbag standard for 1990 models in North America. Seat Belts: 3-point retractable front seat belts Rollover Protection: Reinforced windshield frame and optional pop-up roll bar behind seats. 💡 Technology Features Infotainment Audio System: Basic AM/FM stereo with cassette player, typically 4 or 6 speakers. Gauges: Analog tachometer, speedometer, fuel gauge, temperature gauge, oil pressure (on some models). Driver Assistance ABS: Optional on early models, became more common in later NA production years. Manual will specify if ABS components are covered. Connectivity Connectivity Features: None (pre-modern era connectivity) 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 miles or 6 months, whichever comes first. Air Filter Replacement: Inspect every 15,000 miles; replace as needed (typically every 30,000 miles). Spark Plug Replacement: Every 30,000 miles (NGK BP5E or equivalent specified in manual). Timing Belt Replacement: Every 60,000 miles or 5 years (CRITICAL maintenance item). Fluid Specifications Coolant Type: Ethylene Glycol based, Mazda Long Life Coolant or equivalent (50/50 mix with distilled water). Brake Fluid Type: DOT 3 or DOT 4 Hydraulic Brake Fluid Clutch Fluid Type: DOT 3 or DOT 4 Hydraulic Brake Fluid (shared reservoir with brakes) Known Issues Common Wear Items: Rear main seal leaks, clutch slave cylinder failure,...