This comprehensive service and repair manual is specifically designed for the BMW 7-series E23 model year 1979. It provides in-depth technical information and step-by-step instructions to help you maintain, service, diagnose, and repair your vehicle. The manual is identical to the one used by BMW technicians at dealerships, ensuring you have access to the most accurate and up-to-date information. The manual covers a wide range of topics, including: * **Maintenance:** Routine maintenance procedures like oil changes, filter replacements, and fluid checks. * **Engine:** Detailed information on engine components, operation, troubleshooting, and repair procedures. * **Control System:** Comprehensive coverage of the vehicle's electronic control system, including sensors, actuators, and diagnostics. * **Mechanical:** Information on the vehicle's mechanical systems, such as the transmission, suspension, brakes, and steering. * **Fuel Service Specifications:** Detailed specifications for fuel systems, including fuel injection, fuel lines, and fuel tanks. * **Emission Control:** Information on the vehicle's emission control systems and how to maintain and troubleshoot them. * **Intake Exhaust Cooling:** Detailed information on the intake and exhaust systems, including cooling systems. * **Lube:** Lubrication requirements for all vehicle components, including recommended oils and fluids. * **Ignition Starting Charging:** Procedures for servicing and repairing the ignition, starting, and charging systems. * **Auto Transmission Clutch:** Information on automatic transmission systems, including operation, maintenance, and repair. * **Manual Transmission:** Detailed coverage of manual transmission systems, including operation, maintenance, and repair. * **Transfer Propeller Shaft:** Procedures for servicing and repairing the transfer case and propeller shaft. * **Drive Shaft:** Information on drive shaft components, operation, maintenance, and repair. * **Differential:** Detailed coverage of the differential, including operation, maintenance, and repair. * **Axle Suspension:** Comprehensive information on the suspension system, including components, operation, and repair. * **Tire & Wheel:** Information on tires and wheels, including sizing, maintenance, and repair. * **Brake Control:** Detailed coverage of the brake control system, including components, operation, and troubleshooting. * **Brake:** Comprehensive information on brake systems, including components, operation, maintenance, and repair. * **Parking Brake:** Detailed coverage of parking brake systems, including operation, maintenance, and repair. * **Steering Column:** Information on the steering column, including components, operation, and repair. * **Power Steering:** Detailed coverage of the power steering system, including components, operation, maintenance, and repair. * **Air Condition:** Information on the air conditioning system, including components, operation, maintenance, and repair. * **Suppl Restraint System:** Detailed information on the supplemental restraint system, including operation and maintenance. * **Seat Belt:** Information on seat belts, including operation, adjustment, and repair. * **Engine Immobilizer:** Detailed coverage of the engine immobilizer system, including operation and troubleshooting. * **Cruise Control:** Information on cruise control systems, including operation, maintenance, and repair. * **Wiper & Washer:** Detailed information on windshield wipers and washers, including operation, maintenance, and repair. * **Door Lock:** Information on door locks, including operation, maintenance, and repair. * **Meter Audio/Visual:** Information on the vehicle's instrument cluster, including operation and troubleshooting. * **Horn:** Information on the vehicle's horn, including operation, maintenance, and repair. * **Windshield/Glass Mirror:** Information on the windshield, glass, and mirrors, including replacement and repair. * **Instrument Panel:** Detailed information on the instrument panel, including components, operation, and repair. * **Seat:** Information on vehicle seats, including operation, adjustment, and repair. * **Engine Hood/ Door:** Information on the engine hood and doors, including operation, maintenance, and repair. * **Exterior & Interior:** Information on the vehicle's exterior and interior, including components, operation, and repair. * **Electrical:** Comprehensive coverage of the vehicle's electrical system, including wiring diagrams, troubleshooting, and repair. * **Multiplex/ Can Communication:** Detailed information on the vehicle's multiplex and CAN communication systems. This manual contains numerous illustrations, diagrams, and wiring schematics to help you visualize and understand the repair process. The clear and concise language makes it easy to follow and understand, even for those without extensive automotive experience. This manual will empower you to perform a wide range of repairs on your BMW 7-series E23, saving you time and money in the long run.

The BMW 7-Series E23, introduced in 1977, marked the beginning of the iconic 7-Series lineage, establishing BMW as a force in the luxury car segment. This first generation of the 7-Series was a significant departure from BMW's previous offerings, aiming for a larger, more luxurious, and comfortable driving experience. The E23 was based on a new platform, featuring a longer wheelbase and a wider track compared to its predecessors. It offered a choice of powerful six-cylinder and V8 engines, ranging from the 3.0-liter M30 inline-six to the 3.2-liter and 3.5-liter V8s, all mated to a four-speed automatic or a five-speed manual transmission. The E23 further introduced advanced features for its time, including power steering, power windows, air conditioning, and an optional cruise control system. Its focus on luxury was evident in the plush interior, featuring high-quality leather upholstery, wood trim, and a high level of sound insulation. Beyond its comfort and refinement, the E23 7-Series maintained the renowned BMW handling characteristics. With independent suspension on all four wheels and precise steering, the E23 offered a surprisingly sporty driving experience for a car of its size. The E23's sophisticated design, coupled with its emphasis on comfort and driving pleasure, solidified its position as a formidable player in the luxury car market. Its success laid the foundation for the subsequent iterations of the 7-Series, which have continued to evolve and redefine the luxury sedan segment for decades. The E23, often regarded as a significant turning point in BMW's history, remains a coveted classic, appreciated for its timeless design, elegant styling, and driving dynamics.