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Bmw Bmw E23 7 Series

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BMW E23 7 Series: A Comprehensive Buyer's Guide

The BMW E23 7 Series, produced from 1977 to 1987, represents BMW's first foray into the full-size luxury sedan market. It was designed to compete with the Mercedes-Benz S-Class and set a new standard for driving dynamics in its segment. Combining comfort, performance, and advanced technology for its time, the E23 laid the foundation for the success of future 7 Series generations. It is considered a classic now, representing a more analog and connected driving experience compared to modern luxury cars.

Generations & Key Changes

  • First Generation (E23; 1977-1987): This single generation saw several refinements and engine updates throughout its production run.

Key milestones within the E23 generation:

  • 1977: Initial launch with models like the 730 and 733i, featuring the M30 inline-six engine with Bosch L-Jetronic fuel injection.
  • 1979: Introduction of the 735i, replacing the 733i, with an updated version of the M30 engine. Rear self-leveling suspension was introduced as an option.
  • 1980: Minor interior updates, including improved seating and trim options.
  • 1983: A significant facelift brought revised front and rear styling, including a lower hood line, updated bumpers, and revised taillights. The interior also received updates, and the high-performance 745i model was introduced (initially with the M102 turbocharged engine, later with the M106). The 732i replaced the 730 in some markets.
  • 1984: The 745i changed to the M106 engine, due to performance reasons and regulations.
  • 1986: Anti-lock Braking System (ABS) became standard on all models.

Reliability & Common Issues

The E23, while generally robust, has its share of age-related issues. Thorough inspection and maintenance are crucial for these classic BMWs.

Engine (M30 Inline-Six):

  • Oil Leaks: The M30 engine is notorious for oil leaks, particularly from the valve cover gasket, oil pan gasket, and rear main seal. Regular checks and timely gasket replacements are essential.
  • Timing Chain: The timing chain, although durable, can stretch over time, leading to timing issues. Listen for rattling noises, especially on startup.
  • Cooling System: Overheating is a common concern. Inspect the radiator, hoses, water pump, and thermostat for leaks and proper function. Replacing these components preventatively is highly recommended.
  • Fuel Injection (Bosch L-Jetronic): The L-Jetronic system can suffer from issues like faulty sensors (e.g., temperature sensor, throttle position sensor), fuel injector problems, and vacuum leaks. These can lead to poor running, rough idling, and decreased fuel economy.

Transmission (Automatic & Manual):

  • Automatic Transmissions: The automatic transmissions (typically ZF units) are generally reliable but can develop slipping issues with age and lack of maintenance. Fluid changes are crucial. Inspect for jerky shifts or delays in engagement.
  • Manual Transmissions: The manual transmissions are typically more robust but can experience clutch wear and synchro issues.

Suspension & Brakes:

  • Suspension: The suspension bushings and ball joints can wear out, leading to loose handling and poor ride quality. The rear self-leveling suspension (if equipped) can be prone to leaks and require specialized repairs.
  • Brakes: Ensure the brake system is functioning correctly, including the master cylinder, brake lines, calipers, and rotors. ABS (introduced later in the production run) can be sensitive and require proper diagnostics.

Electrical System:

  • Wiring: Age-related wiring issues are common, including brittle insulation and corroded connectors. This can lead to electrical shorts and malfunctioning components.
  • Central Locking System: The central locking system can be problematic, with door lock actuators failing.
  • Instruments: The instrument cluster can experience issues like faded displays and malfunctioning gauges.

Body & Interior:

  • Rust: Rust is a major concern, especially in areas prone to moisture, such as the rocker panels, wheel wells, and floor pans.
  • Interior: The interior can show signs of wear and tear, including cracked leather, faded trim, and broken switches. Reupholstering and replacing worn components can be costly.

Driving Experience

The E23 offers a unique blend of comfort, performance, and driver involvement that is hard to find in modern luxury cars.

Pros:

  • Smooth Engine: The M30 engine provides ample power and a smooth, refined driving experience.
  • Comfortable Ride: The E23 offers a comfortable ride, especially on long journeys.
  • Classic Styling: The E23's iconic design is timeless and turns heads.
  • Driver Involvement: The E23 provides a more analog and connected driving experience compared to modern cars. The steering is direct and responsive, and the chassis provides good feedback.

Cons:

  • Fuel Economy: Fuel economy is not a strong point, especially with the older fuel injection systems.
  • Maintenance: The E23 requires regular maintenance and can be expensive to repair.
  • Age-Related Issues: Age-related issues, such as rust and electrical problems, are common.
  • Availability of Parts: Some parts can be difficult to find and expensive.

Buying Advice

What to Look For:

  • Rust-Free Examples: Prioritize finding an E23 with minimal rust. A pre-purchase inspection by a qualified mechanic is essential.
  • Well-Maintained Examples: Look for cars with documented service history. Evidence of regular oil changes, coolant flushes, and other maintenance is a good sign.
  • Later Models (1983-1987): The facelifted models (1983-1987) generally offer improved features and reliability. The 735i and 745i (especially with the later M106 engine) are desirable models.
  • Originality: Cars with original components and minimal modifications tend to be more valuable and easier to maintain.

What to Avoid:

  • Rust Buckets: Avoid cars with significant rust, as repairs can be costly and time-consuming.
  • Neglected Examples: Cars with a lack of maintenance history are a red flag.
  • Extensively Modified Cars: Modifications can compromise reliability and resale value.
  • Early 730 Models (carbureted versions): The early carbureted 730 models can be difficult to maintain and are generally less desirable than the fuel-injected models.

Final Thoughts: The BMW E23 7 Series is a classic luxury sedan that offers a unique driving experience. While it requires careful inspection and maintenance, a well-preserved example can be a rewarding ownership experience. Be prepared for the realities of owning a classic car, including potential repairs and the need for specialized knowledge.

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