🏷️ Basic Information Identification Make: BMW Model: 7 Series Chassis Code: E32 Model Variants: 735i, 735iL, 750iL Model Years Covered: 1990, 1991 Codes Engine Codes 735I 735Il: M30B35 Engine Codes 750Il: M70B50 👋 Introduction Market Position Target Audience: Professional Automotive Technicians, BMW Enthusiasts, DIY Mechanics with electronic diagnostic experience Value Proposition: Essential resource for diagnosing complex electronic and electrical issues on the E32 7 Series Competitive Analysis Uniqueness: Specialized focus on electronic troubleshooting, complementing general repair manuals Key Features Diagnostic Focus: Emphasizes systematic fault finding, wiring diagrams, and component testing Electronic Systems Depth: In-depth coverage of early electronic control units and sensors prevalent in the late 1980s/early 1990s 📋 Manual Details Coverage Areas Coverage Scope: Electronic Troubleshooting and Diagnosis Page Count Estimated Page Count: Approx. 500-700 (typical for this type of specialized manual) Manual Type Manual Type: Electronic Troubleshooting Manual / Diagnostic Manual Language Language: English Format Format: Digital (likely PDF or similar electronic format) 📖 Manual Coverage Systems Covered Engine Management: DME (Digital Motor Electronics), ignition systems, fuel injection, emission controls, idle control Transmission Control: Electronic transmission control unit (e.g., for automatic transmissions), shift solenoids, hydraulic control Chassis Electronics: ABS (Anti-lock Braking System), ASC (Automatic Stability Control), EDC (Electronic Damper Control) Body Electronics: Central locking, power windows, mirrors, seats, climate control, lighting, instrument cluster, warning lights Diagnostics: Diagnostic trouble codes (DTCs), diagnostic connectors (e.g., OBD-I style), troubleshooting flowcharts, component testing procedures Wiring Diagrams: Detailed electrical schematics for all major systems Procedures Included Troubleshooting Methodology: Systematic diagnostic procedures, symptom-based troubleshooting, component testing Diagnostic Tool Usage: Guidance on using BMW-specific diagnostic tools or generic scan tools for fault code retrieval and live data analysis Sensor Testing: Procedures for testing various sensors (e.g., MAF, O2, crank/cam position, ABS sensors) Actuator Testing: Procedures for testing electronic actuators (e.g., fuel injectors, ignition coils, idle control valve, solenoids) Technical Depth Diagnostic Level: Advanced diagnostics, electronic system fault finding, component-level troubleshooting Repair Information: Focus on identifying faults and guiding repairs through diagnostic steps, less on physical repair procedures themselves 📊 Manual Specifications File Format File Type: PDF Searchable Text: Likely searchable text for quick access to information Print Quality Printability: Designed for digital viewing, printable for workshop use Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine 735I 735Il Engine Designation: M30B35 Engine Type: 3.5L Inline 6-cylinder, SOHC Bore X Stroke: 92 mm x 86 mm Compression Ratio: 8.0:1 or 9.0:1 (depending on market/year) Horsepower Est: 208 hp @ 5700 rpm (approx.) Torque Est: 225 lb-ft @ 4000 rpm (approx.) Primary Engine 750Il Engine Designation: M70B50 Engine Type: 5.0L V12, SOHC Bore X Stroke: 84 mm x 90 mm Compression Ratio: 8.8:1 Horsepower Est: 296 hp @ 5200 rpm (approx.) Torque Est: 332 lb-ft @ 4100 rpm (approx.) Fuel System Fuel Injection: Bosch Motronic electronic fuel injection (e.g., Motronic 1.2 for M30, Motronic 1.7 for M70) Fuel Type: Unleaded Premium Gasoline (91 Octane or higher) 🔧 Transmission Standard 735I 735Il Transmission Type: 4-speed Automatic (ZF 4HP-22) Optional 735I 735Il Transmission Type: 5-speed Manual (Getrag 265 - rare) Standard 750Il Transmission Type: 4-speed Automatic (ZF 4HP-24) Features Automatic Transmission Control: Electronic control for shift points and modes Fluid Specifications Automatic Transmission Fluid: BMW ATF LT-3 (or equivalent Dexron III/Mercon spec fluids) 📐 Dimensions Exterior 735I Length: 197.4 inches (5014 mm) Width: 71.7 inches (1821 mm) Height: 55.5 inches (1410 mm) Exterior 735Il 750Il Length: 202.1 inches (5133 mm) Wheelbase: 117.4 inches (2982 mm) Weights Curb Weight 735I: 3858 lbs (1750 kg) Curb Weight 750Il: 4387 lbs (1990 kg) 🛡️ Safety Features Ratings NHTSA Crash Test Ratings: Not readily available for this era of vehicles, focus on design features Active Features ABS: Standard (Bosch ABS III) Asc: Optional on 735i/iL, Standard on 750iL (Automatic Stability Control) Edc: Optional (Electronic Damper Control) for adaptive suspension Passive Features Airbags: Driver's airbag standard from 1990 onwards, passenger airbag optional Seatbelts: Front and rear seatbelts, pre-tensioners for front belts Body Construction: High-strength steel chassis and safety cage 💡 Technology Features Infotainment Audio System: BMW Professional Radio/Cassette with optional CD changer and premium sound systems (e.g., Bavaria C Professional RDS). Climate Control: Automatic climate control with dual-zone temperature settings. Driver Assistance Cruise Control: Standard electronic cruise control. Parking Sensors: Optional rear parking aid (Park Distance Control). Connectivity Onboard Computer: Check Control system providing status and warnings for various vehicle functions. Diagnostic Interface: OBD-I diagnostic port for accessing fault codes and live data. 🔧 Maintenance Service Intervals General Oil Change Interval: Every 7,500 to 10,000 miles (12,000 to 15,000 km) or annually, depending on driving conditions and oil type. Engine Oil Filter Interval: Replace with every oil change. Spark Plug Replacement M30: Typically every 30,000 miles (48,000 km) for standard plugs. Spark Plug Replacement M70: 12 spark plugs, typically every 30,000 miles (48,000 km) for...