Target Audience:
BMW M3 E30 owners, independent repair shops, automotive technicians specializing in classic BMWs
Value Proposition:
Essential resource for diagnosing and repairing complex electrical issues specific to the 1987 BMW M3 E30, often scarce in general repair manuals.
Ease Of Use:
Designed for ease of navigation with clear diagrams and structured troubleshooting steps.
Accuracy:
Official BMW documentation ensuring technical accuracy and completeness for electrical systems.
Powertrain Electrical:
Engine Control Unit (ECU), fuel injection, ignition system, starter, alternator
Chassis Electrical:
Lighting (headlights, taillights, interior), horn, wipers, washers, power windows, mirrors
Comfort Convenience:
HVAC controls, central locking, alarm system (if equipped), radio/audio system wiring
Instrumentation Gauges:
Speedometer, tachometer, fuel gauge, temperature gauge, oil pressure warning light, warning indicators
Safety Systems:
Brake warning lights, ABS wiring (if equipped), turn signals
Diagnostic Procedures:
Step-by-step troubleshooting flowcharts, symptom-based diagnostics, voltage drop testing, continuity testing
Component Testing:
Testing procedures for relays, solenoids, sensors, motors, switches
Wiring Diagrams:
Detailed, color-coded wiring schematics for all major electrical systems
Fuse Relay Identification:
Location and function of all fuses and relays
Connector Pinouts:
Identification of pin configurations for various electrical connectors
Depth:
Comprehensive diagnostic and repair information for advanced technicians and knowledgeable DIY enthusiasts
Engine Type:
Naturally Aspirated Inline-4
Displacement:
2.3 Liters (2302 cc)
Bore X Stroke:
91 mm x 84 mm
Compression Ratio:
10.5:1
Valve Train:
DOHC, 4 valves per cylinder
Horsepower Ps:
192 hp @ 6,500 rpm
Torque Lb-Ft:
170 lb-ft @ 4,750 rpm
Fuel Delivery:
Bosch L-Jetronic Fuel Injection
Fuel Type:
Unleaded Premium Gasoline (91 Octane or higher)
ECM Type:
Bosch Motronic (specific model varies)
Length:
4,330 mm (170.5 in)
Width:
1,680 mm (66.1 in)
Height:
1,370 mm (53.9 in)
Wheelbase:
2,565 mm (101.0 in)
Curb Weight:
Approx. 1,200 kg (2,646 lbs)
Gross Vehicle Weight Rating:
Approx. 1,750 kg (3,858 lbs)
NHTSA Rating:
Not explicitly rated under modern standards, considered robust for its era.
Braking System:
Front Ventilated Disc, Rear Solid Disc
ABS:
Optional (Bosch ABS II) on some models
Seatbelts:
3-point front seatbelts
Body Structure:
Reinforced passenger cell, crumple zones
Oil Change Interval:
Every 5,000-7,500 miles or annually, depending on usage.
Spark Plug Replacement:
Approx. 30,000 miles
Timing Belt Replacement:
N/A (Chain-driven engine)
Engine Oil Type:
SAE 15W-50 Synthetic or 20W-50 Synthetic (check owner's manual for specific ambient temp recommendations)
Coolant Type:
BMW Blue Antifreeze/Coolant (G48) or equivalent Ethylene Glycol based with corrosion inhibitors
Brake Fluid Type:
DOT 4 (low viscosity, high performance)
Transmission Fluid Type:
GL-4 Gear Oil (e.g., Castrol TAF-X or equivalent)
Differential Fluid Type:
SAE 75W-90 Synthetic Gear Oil (GL-5)
Common Electrical Faults:
Corroded wiring harnesses, failing fuel pump relays, dashboard illumination issues, starter solenoid problems, vacuum leaks affecting engine sensors.
Engine Related:
Head gasket issues, valve stem seals, idle control valve problems, injector failures.
Chassis Related:
Rust (especially wheel arches, sills), suspension bushings, seized brake calipers.
