Covered Years:
1984-1991 (specifically listing 1984, 1985, 1986, 1987, 1989, 1990 as per product description)
Engine Codes:
M10 (e.g., M10B18), M20 (e.g., M20B25, M20B27)
Vehicle Segment:
Compact Executive Sports Sedan/Coupe/Convertible
Key Competitors:
Mercedes-Benz W201 (190E), Audi 80/90, Alfa Romeo 75, Ford Sierra, Peugeot 405
Driving Dynamics:
Renowned for excellent handling, rear-wheel drive dynamics, driver-focused cockpit, balanced chassis
Engineering Philosophy:
BMW's signature 'ultimate driving machine' ethos, robust German engineering
Mechanical Systems:
Engine, Fuel System (Fuel Injection), Lubrication System, Cooling System, Exhaust System, Transmission (Automatic & Manual), Drivetrain, Steering System, Suspension System, Brake System, Clutch System
Electrical Systems:
Ignition System, Charging System, Starting System, Lighting System, Instrumentation, Wiper/Washer System, Airbag System (though often limited on early E30s, check manual specifics), ABS (Anti-lock Braking System)
Body And Interior:
Body Panels, Doors, Windows, Seats, Interior Trim, HVAC (Heating & Air Conditioning)
Maintenance Procedures:
Routine maintenance, oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspections and replacement, brake pad/rotor service
Repair Procedures:
Engine overhaul (including cylinder head removal, valvetrain service, camshaft timing), transmission overhaul, differential service, suspension component replacement, brake caliper rebuild, radiator and cooling system repair, fuel system component replacement, exhaust system repair, starter and alternator replacement, HVAC system diagnosis and repair
Troubleshooting And Diagnostics:
Diagnostic procedures for engine performance, electrical faults, fuel system issues, transmission problems; fault code interpretation (where applicable)
Diagnostic Capabilities:
Advanced diagnostics, wiring diagrams, component testing procedures, specifications for measurements and tolerances
Rebuild Information:
Detailed procedures for engine and transmission rebuilds, including torque specifications, assembly sequences, and critical tolerances
Wiring Diagrams:
Complete electrical wiring diagrams for all major systems
Engine Variants Covered:
318i (M10B18, 1.8L I4), 325e (M20B27, 2.7L I6 'Eta'), 325i/325is (M20B25, 2.5L I6)
318I Power:
Approx. 101-114 hp (depending on market and year)
325E Power:
Approx. 121-124 hp (focused on torque)
325I Power:
Approx. 168-171 hp
325Is Power:
Approx. 168-171 hp (often with sport suspension and LSD)
Injection System:
Bosch Motronic (various versions depending on engine and year)
Standard Transmission Type:
Getrag 260 5-speed manual (common on 325i/is)
Optional Transmission Type:
ZF 4HP22 4-speed automatic
Drivetrain:
Rear-wheel drive (RWD)
Differential:
Open differential standard; Limited-slip differential (LSD) optional on some models (e.g., 325is)
Body Styles:
2-door sedan (E30), 4-door sedan (E30), Convertible (E30), Touring (E30 - less common in North America), M3 (E30 - specific models)
Curb Weight Range:
Approx. 2600-3000 lbs (1180-1360 kg) depending on body style and engine
Crash Test Information:
E30 models predate modern stringent crash testing standards. However, they were known for robust unibody construction for their era.
Anti Lock Brakes:
ABS was optional on most models and standard on some later/higher trims (e.g., 325is). Covered in manual.
Airbag System:
Driver airbag became available in later production years (late 80s/early 90s). Covered in manual if equipped.
Seat Belts:
Standard 3-point front and rear seatbelts.
Audio System:
Factory-installed radios were basic AM/FM, often with cassette players. Aftermarket upgrades are common.
Instrument Cluster:
Clear, driver-oriented dashboard with tachometer, speedometer, fuel gauge, and temperature gauge. Check control panel for system warnings.
Cruise Control:
Optional on many models.
Factory Connectivity:
None (no Bluetooth, USB, or smartphone integration from factory).
Oil Change Interval:
Typically 5,000-7,500 miles (8,000-12,000 km) or annually, depending on driving conditions and oil type used. Manual will specify.
Timing Belt Chain:
M10 engines use a timing chain (low maintenance). M20 engines use a timing belt, typically requiring replacement every 30,000-50,000 miles (48,000-80,000 km). Critical to follow manual's recommendation.
Engine Oil Type:
Varies by engine and temperature. Typically 20W-50, 10W-40, or 15W-50. Manual will specify exact BMW approval and viscosity.
Coolant Type:
Ethylene glycol-based coolant. Manual will detail mixture ratio and specific BMW coolant specifications.
Transmission Fluid Type Manual:
Manual transmissions typically use SAE 75W-90 or 80W-90 gear oil. Manual will specify type and capacity.
Transmission Fluid Type Auto:
Automatic transmissions require specific ATF (Automatic Transmission Fluid), e.g., Dexron III or equivalent. Manual will specify.
Common E30 Issues:
Rust (especially around shock towers, jacking points, rocker panels), cooling system leaks (hose failures, plastic expansion tank cracking), oil leaks (valve cover gasket, oil pan gasket, rear main seal), fuel distributor issues (on M20 engines), door panel separation, sagging headliner, worn suspension bushings, headlight switch failure.
Engine Management:
Bosch Motronic systems require careful diagnosis. Ensure proper air intake sealing, fuel pressure, and sensor function.
Bmw History:
Bayerische Motoren Werke AG, a German luxury and performance automotive manufacturer, known for its inline-six engines and sporting heritage.
E30 Introduction:
Launched in 1982 as the successor to the E21 3 Series. The E30 defined the modern compact executive sport sedan segment and is one of BMW's most iconic models.
E30 Body Styles:
Initially introduced as a 2-door sedan, followed by a 4-door sedan, convertible, and later the renowned M3 variant. Touring (wagon) was also produced for some markets.
Production Years:
1982-1994 (though the manual focuses on the earlier part of this range).
