🏷️ Basic Information

Make:

BMW

Model:

750iL

Year:

1991

Chassis Code:

E32

👋 Introduction

Positioning:

The 1991 BMW 750iL (E32) represented the pinnacle of BMW's luxury sedan offerings, competing with other flagship models from Mercedes-Benz (S-Class) and other luxury marques.

Competitors:

Mercedes-Benz W140 S-Class, Lexus LS 400, Jaguar XJ series.

Vehicle Highlights:

V12 engine, long wheelbase (iL designation), sophisticated luxury amenities, advanced (for its time) technology, refined ride quality.

Value:

Provides essential information for owners and technicians to maintain and repair this complex luxury vehicle, preserving its performance and longevity.

📋 Manual Details

Covered Regions:

Global (primarily North American specifications but relevant to all E32 750iL)

Total Pages:

Hundreds (exact count varies by official print run, but described as comprehensive)

Type:

Factory Service Repair Manual

Language:

English

Format:

Download PDF

📖 Manual Coverage

Engine:

Detailed troubleshooting, repair, and overhaul for M70 V12 engine, including dual ignition and fuel injection systems.

Transmission:

Repair and maintenance of the 4-speed automatic transmission (e.g., ZF 4HP24).

Drivetrain:

Rear-wheel drive system, driveshaft, differential, axle shafts.

Suspension:

Front and rear suspension components, including struts, control arms, bushings, and potentially self-leveling rear suspension (if applicable to specific 1991 models).

Brakes:

Hydraulic brake system, ABS (Anti-lock Braking System) diagnostics and repair, front/rear brake assembly, parking brake.

Steering:

Power steering system, steering gear, steering column, wheel alignment specifications.

Electrical:

Complete wiring diagrams, fuse box locations, battery, alternator, starter, lighting systems, power accessories, instrument cluster, onboard diagnostics (OBD I).

Body:

Body shell repair, doors, windows, locks, body hardware, interior trim, exterior trim, paint specifications, rust prevention.

HVAC:

Climate control system, A/C compressor, refrigerant, heater core, blower motor, controls.

Fuel System:

Fuel tank, fuel pump, fuel lines, fuel injectors, fuel pressure regulator, emission control systems.

Cooling System:

Radiator, coolant, water pump, thermostat, cooling fan, hoses.

Exhaust System:

Exhaust manifolds, catalytic converters, mufflers, pipes.

Maintenance:

Routine maintenance checks, oil changes, filter replacements, spark plug replacement, fluid checks and top-offs.

Troubleshooting:

Diagnostic procedures for common and uncommon issues, fault codes interpretation (OBD I).

Repair:

Step-by-step repair instructions for all major vehicle systems.

Overhaul:

Complete engine and transmission overhaul procedures, including component specifications and tolerances.

Diagnostics:

Detailed diagnostic flowcharts and procedures for electrical and mechanical systems.

Installation:

Procedures for installing replacement parts and accessories.

Depth:

Comprehensive: Covers everything from basic maintenance to complete engine and transmission rebuilds, electrical diagnostics, and bodywork.

📊 Manual Specifications

Format Details:

Digital PDF, searchable text, bookmark functionality.

Quality:

High-resolution scans ensuring clarity of text and diagrams, suitable for printing.

Binding:

N/A (Digital PDF download)

Paper Type:

N/A (Digital PDF download)

⚙️ Engine Specifications

Engine Code:

M70

Engine Configuration:

V12, 60-degree bank angle

Displacement:

4.988 liters (304.4 cu in)

Horsepower SAE Net:

296 hp @ 5200 rpm

Torque SAE Net:

332 lb-ft @ 3900 rpm

Fuel Delivery:

Electronic multi-point fuel injection (Bosch Motronic DME)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher)

Ignition Type:

Dual ignition system (two spark plugs per cylinder)

Bore X Stroke:

84.0 mm x 90.0 mm

Compression Ratio:

8.8:1

Cooling Capacity:

Approx. 14.0 liters (14.8 quarts)

🔧 Transmission

Type:

4-speed Automatic

Manufacturer Model:

ZF 4HP24

Type:

None (only automatic was offered for 750iL)

Electronic Control:

Electronically controlled transmission with multiple shift modes (e.g., Economy, Sport).

Transmission Fluid:

BMW ATF LT-3 (or equivalent, consult manual for precise Dexron specification if applicable for this era).

Capacity:

Approx. 8.0 liters (8.5 quarts) for refill, higher for complete overhaul.

📐 Dimensions

Length:

5124 mm (201.7 in)

Width:

1800 mm (70.9 in)

Height:

1400 mm (55.1 in)

Wheelbase:

3070 mm (120.9 in)

Curb Weight:

Approx. 1920 kg (4233 lbs)

Gross Vehicle Weight Rating:

Approx. 2400 kg (5291 lbs)

🛡️ Safety Features

Crash Test Data:

No specific NHTSA/IIHS ratings for this 1991 model year in the modern sense, but built to high safety standards of the era. Manual provides structural repair information.

ABS:

Standard Anti-lock Braking System (ABS).

Airbags:

Driver's side airbag standard.

Seatbelts:

Front and rear seat belts, potentially with pre-tensioners.

💡 Technology Features

Audio System:

Premium Hi-Fi audio system, often with Nakamichi branding, cassette player.

Navigation:

Optional early GPS navigation system available on some models.

Traction Control:

Automatic Stability Control (ASC) available on some models.

Phone:

Optional integrated car phone system.

Onboard Diagnostics:

OBD I (On-Board Diagnostics I) system with proprietary BMW diagnostic connectors and procedures.

🔧 Maintenance

Oil Change:

Refer to manual for specific interval, typically every 7,500 - 10,000 miles or annually, depending on driving conditions. Use synthetic oil.

Spark Plugs:

Inspect at 30,000 miles, replace as needed. Dual plugs per cylinder require specific Bosch plugs.

Coolant Flush:

Every 2 years or 30,000 miles.

Engine Oil:

SAE 5W-30 or 10W-30 Synthetic (refer to manual for exact BMW approval).

Coolant:

BMW Blue Antifreeze/Coolant (or equivalent ethylene glycol-based coolant with corrosion inhibitors).

Brake Fluid:

DOT 4 Low Viscosity (LV) brake fluid.

Power Steering Fluid:

BMW Power Steering Fluid (Pentosin CHF 11 S or compatible).

Engine M70:

Coil pack failure (due to dual ignition), idle control issues, sensor failures (e.g., MAF), oil leaks, specific harness issues. The manual addresses diagnostics for these.

E32 Common:

ABS/ASC errors, climate control module faults, headliner sagging, door seal degradation, central locking issues, wear on suspension bushings.

Part Notes:

Specialized V12 parts may be scarce; manual helps identify correct part numbers for sourcing.

📚 Vehicle History

Bmw Legacy:

BMW has a long-standing reputation for building high-performance luxury vehicles with a focus on driving dynamics and engineering excellence.

E32 Generation:

The E32 generation (1986-1994) marked a significant advancement in BMW's flagship sedan design and technology, with the 750iL representing the ultimate expression of luxury and power within the range.

Production Years:

E32 7 Series produced from 1986 to 1994. The 750iL variant was introduced in 1987.

Manufacturing Location:

Germany

🏆 Awards & Recognition

Automotive Press:

While specific awards for the 1991 750iL are not widely documented in the way modern cars are, it was consistently praised by automotive journalists for its smooth V12 engine, luxurious interior, and refined ride.

Owner Satisfaction:

Known for owner satisfaction related to its luxurious feel and powerful performance, though maintenance costs can be higher than average.