1990 Acura Legend Service Manual

The 1990 Acura Legend is a luxury executive car featuring a 2.7L V6 engine, front-wheel drive, 4-speed automatic or 5-speed manual transmission, power steering, ABS brakes, air conditioning, power windows/locks, and premium audio system. This service manual covers maintenance procedures, specifications, troubleshooting, and repair instructions for all major systems including engine, transmission, suspension, brakes, electrical, and body components.

1. Vehicle Specifications 2. Maintenance Schedule 3. Engine System 4. Transmission 5. Brake System 6. Suspension & Steering 7. Electrical System 8. Heating & AC 9. Body & Interior 10. Troubleshooting Guide 11. Technical Service Bulletins

Vehicle Specifications

Complete technical specifications for the 1990 Acura Legend models including sedan and coupe variants.

Specification	Details
Engine Type	2.7L SOHC V6 (C27A)
Horsepower	160 hp @ 5800 rpm
Torque	162 lb-ft @ 4500 rpm
Transmission	4-speed automatic or 5-speed manual
Fuel System	Multi-point fuel injection
Brake System	Power-assisted disc brakes with ABS
Suspension	Independent double-wishbone
Fuel Capacity	18.0 gallons
Curb Weight	Approx. 3,200 lbs
Wheelbase	108.7 inches

Maintenance Schedule

Recommended maintenance intervals and service procedures for optimal vehicle performance.

Oil and filter change: Every 7,500 miles or 12 months
Tire rotation: Every 7,500 miles
Air filter replacement: Every 30,000 miles
Spark plugs: Every 30,000 miles
Timing belt: Every 90,000 miles
Brake fluid flush: Every 30,000 miles or 2 years
Coolant replacement: Every 60,000 miles or 5 years

WARNING! Always use genuine Acura parts for optimal performance and warranty compliance.

Engine System

Detailed service procedures for the 2.7L V6 engine including diagnostics and repair.

Compression: Standard 178 psi, minimum 142 psi
Oil Pressure: 50-65 psi at 3000 rpm
Valve Clearance: Intake 0.15-0.19 mm, Exhaust 0.20-0.24 mm
Ignition Timing: 15° BTDC at idle
Fuel Pressure: 35-40 psi with vacuum, 40-45 psi without vacuum
Idle Speed: 650 ± 50 rpm (automatic), 750 ± 50 rpm (manual)

CAUTION! Always disconnect battery before performing electrical work.

Transmission

Service procedures for both automatic and manual transmission systems.

Automatic transmission fluid change: Every 30,000 miles
Manual transmission fluid: Replace every 60,000 miles
Shift linkage adjustment: Check every 15,000 miles
Clutch system: Inspect every 15,000 miles

Fluid Specifications: ATF-Z1 for automatic, Honda MTF for manual transmission

Brake System

Complete brake system maintenance and repair procedures.

Component	Specification
Front Brake Pads	Minimum thickness 1.0 mm
Rear Brake Pads	Minimum thickness 1.0 mm
Rotor Thickness	Front min 20.0 mm, Rear min 9.0 mm
Brake Fluid	DOT 3 or DOT 4
Master Cylinder	Bore diameter 15/16 inch

WARNING! Always bleed brake system after component replacement.

Suspension & Steering

Alignment specifications and suspension component service.

Front Toe: 0 ± 2 mm
Front Camber: -0°30' ± 45'
Caster: +2°45' ± 45'
Rear Toe: 2 ± 2 mm
Rear Camber: -0°30' ± 30'
Steering Wheel Play: 0-10 mm

Electrical System

Wiring diagrams, component testing, and electrical system troubleshooting.

Battery: 12V 55Ah, maintenance-free
Alternator Output: 80A
Starter: 1.4 kW
Fuse Box: Located under dashboard and hood
Bulb Specifications: Headlight 60/55W, Brake light 21W

Tip: Always check fuses before diagnosing electrical issues.

Heating & AC

Climate control system service and refrigerant specifications.

Refrigerant: R-12 (CFC-12)
Refrigerant Capacity: 1.8 lbs (850 g)
Compressor Oil: 6.0 oz Suniso 5GS
Blower Motor: 12V DC
AC Pressure: Low side 25-35 psi, High side 150-250 psi

CAUTION! R-12 refrigerant requires certified technician for service.

Body & Interior

Body repair specifications and interior component service.

Paint Codes: Located on driver's door jamb
Body Panel Gaps: Standard 3-5 mm
Door Adjustment: Hinge bolt torque 16 ft-lbs
Window Regulator: Motor replacement procedure
Seat Belt Inspection: Check every 12 months

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Engine won't start	Battery, starter, fuel pump	Check battery voltage, fuel pressure, spark
Poor acceleration	Fuel filter, air filter, sensors	Replace filters, check TPS and MAP sensors
Transmission slipping	Low fluid, worn clutch	Check fluid level, inspect clutch plates
Brake vibration	Warped rotors	Resurface or replace brake rotors
Electrical issues	Bad grounds, corroded connections	Clean battery terminals, check ground points

Technical Service Bulletins

Common issues and factory-recommended solutions for the 1990 Acura Legend.

TSB 90-001: Cold start hesitation - ECU reprogramming
TSB 90-015: Power window regulator replacement
TSB 90-028: Automatic transmission shift improvement
TSB 90-042: ABS warning light diagnosis
TSB 90-055: Climate control display repair

Service Support: Contact Acura customer service at 1-800-382-2238 for technical assistance.