This comprehensive **1978 BMW 7 Series (E23) Service and Repair Manual** is your ultimate guide to maintaining, servicing, diagnosing, and repairing your vehicle. It is the same manual used by technicians at dealerships to ensure your BMW is in top condition. This manual covers all models and all repairs, providing you with detailed, step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications. You'll have everything you need at your fingertips to tackle any repair. The manual covers a wide range of topics, including: * **Maintenance**: Regular maintenance schedules, fluid checks, and routine services. * **Engine**: Detailed information on engine components, troubleshooting, repair, and rebuild procedures. * **Control System**: Explanations and repair procedures for engine control systems. * **Mechanical**: In-depth coverage of the mechanical systems, including the transmission, drivetrain, brakes, steering, and suspension. * **Fuel Service Specifications**: Detailed information on fuel systems, including injection, carburetor, and fuel lines. * **Emission Control**: Explanations and troubleshooting steps for emission control systems. * **Intake Exhaust Cooling**: Detailed information on cooling systems, intake manifolds, and exhaust systems. * **Lube**: Lubrication specifications and procedures. * **Ignition Starting Charging**: Comprehensive information on ignition systems, starting systems, and charging systems. * **Auto Transmission Clutch**: Detailed information on automatic transmissions and clutches. * **Manual Transmission**: Comprehensive information on manual transmissions. * **Transfer Propeller Shaft**: Information on transfer cases and propeller shafts. * **Drive Shaft**: Information on drive shafts and axles. * **Differential**: Detailed information on differential units and repair procedures. * **Axle Suspension**: In-depth coverage of axles and suspension systems, including troubleshooting and repair. * **Tire & Wheel**: Information on tires, wheels, and related components. * **Brake Control**: Explanations and repair procedures for brake control systems. * **Brake**: Detailed information on brake systems, including disc brakes and drum brakes. * **Parking Brake**: Information and repair procedures for parking brakes. * **Steering Column**: Detailed information on steering columns and components. * **Power Steering**: Information and repair procedures for power steering systems. * **Air Condition**: Comprehensive information on air conditioning systems, including troubleshooting and repair. * **Suppl Restraint System**: Detailed information on supplemental restraint systems, such as airbags. * **Seat Belt**: Information and repair procedures for seat belts. * **Engine Immobilizer**: Explanations and troubleshooting steps for engine immobilizer systems. * **Cruise Control**: Information and repair procedures for cruise control systems. * **Wiper & Washer**: Detailed information on windshield wipers and washer systems. * **Door Lock**: Information and repair procedures for door locks. * **Meter Audio/Visual**: Explanations and repair procedures for instrument clusters and audio/visual systems. * **Horn**: Information and repair procedures for horn systems. * **Windshield/Glass Mirror**: Detailed information on windshields, windows, and mirrors. * **Instrument Panel**: Information and repair procedures for instrument panels. * **Seat**: Detailed information on seats and seat mechanisms. * **Engine Hood/ Door**: Information and repair procedures for engine hoods and doors. * **Exterior & Interior**: Detailed information on exterior and interior components, including trim, body panels, and upholstery. * **Electrical**: Comprehensive information on electrical systems, wiring diagrams, and troubleshooting. * **Multiplex/ Can Communication**: Explanations and troubleshooting steps for multiplex and CAN communication systems. This manual empowers you to understand your car better and perform repairs with confidence.

The 1978 BMW 7 Series (E23) marked the debut of the luxury sedan that would become synonymous with refined driving and opulent comfort. The E23, BMW's first official "7 Series," was a significant departure from its predecessors, ushering in a new era of sophistication and engineering prowess. This generation of the 7 Series was available in several configurations, including the 728i, 730i, and the performance-oriented 735i. The E23 boasted a sleek, boxy design, characterized by sharp lines and a prominent kidney grille, a design language that would influence subsequent BMW models for years to come. Under the hood, the E23 featured a range of powerful and refined six-cylinder engines, paired with a smooth-shifting automatic transmission or a responsive manual gearbox. The E23 was also ahead of its time in terms of safety, offering features like a driver's airbag and crumple zones designed to absorb impact energy in a collision. Beyond its performance and safety, the E23 emphasized luxury and comfort, featuring plush leather interiors, generous legroom, and an array of innovative amenities. The 1978 BMW 7 Series (E23) represented a pivotal moment in automotive history. It cemented BMW's position as a leading manufacturer of luxury vehicles, showcasing its commitment to engineering excellence, innovative design, and unwavering focus on the driver's experience. The E23's legacy continues to resonate today, influencing modern BMW models in terms of its focus on performance, comfort, and technology. Its classic design and refined driving characteristics have earned it a place among the most desirable and sought-after vintage BMWs. For enthusiasts and collectors, the E23 remains an icon of automotive history, a testament to BMW's dedication to creating vehicles that are both luxurious and capable.