1989 Acura Integra D16 Service Manual

The 1989 Acura Integra D16 Service Manual provides comprehensive technical information for the 1.6L D16A1 engine used in the second-generation Acura Integra. This manual covers engine specifications, maintenance procedures, troubleshooting, repair instructions, and technical data for proper servicing of the fuel-injected SOHC 16-valve engine producing 118 horsepower. Below are key sections for specifications, maintenance, repair procedures, and troubleshooting.

1. Engine Specifications 2. Maintenance Schedule 3. Engine Repair Procedures 4. Fuel System 5. Ignition System 6. Cooling System 7. Lubrication System 8. Electrical System 9. Torque Specifications 10. Troubleshooting

Engine Specifications

Technical specifications for the D16A1 1.6L engine used in the 1989 Acura Integra.

Specification	Value
Engine Code	D16A1
Displacement	1.6L (1595 cc)
Configuration	Inline 4-cylinder
Valvetrain	SOHC 16-valve
Bore x Stroke	75mm x 90mm
Compression Ratio	9.3:1
Horsepower	118 hp @ 6250 rpm
Torque	103 lb-ft @ 5500 rpm
Fuel System	PGM-FI (Programmed Fuel Injection)
Oil Capacity	4.2 quarts (with filter)

Maintenance Schedule

Recommended maintenance intervals for optimal engine performance and longevity.

Oil and filter change: Every 7,500 miles or 12 months
Spark plugs: Replace every 30,000 miles
Timing belt: Replace every 60,000 miles
Coolant flush: Every 30,000 miles or 24 months
Air filter: Inspect every 15,000 miles, replace as needed
Fuel filter: Replace every 30,000 miles

WARNING! Always use genuine Honda/Acura parts for optimal performance and reliability.

Engine Repair Procedures

Step-by-step procedures for common engine repairs and component replacement.

Valve adjustment: Cold engine procedure with feeler gauge
Timing belt replacement: Align timing marks before removal
Water pump replacement: Replace with timing belt service
Cylinder head removal: Follow torque sequence for reassembly
Oil pan removal: Requires subframe lowering for access

CAUTION! Always disconnect battery before performing electrical work. Use proper safety equipment.

Fuel System

Fuel Pressure: 35-40 psi (key on, engine off)
Injector Resistance: 1.5-2.5 ohms
Fuel Pump: In-tank electric pump
Fuel Filter: Replace every 30,000 miles
Idle Speed: 700 ± 50 rpm (warm, in neutral)
Throttle Body: Clean every 60,000 miles
Fuel Pressure Regulator: Maintains constant rail pressure

Ignition System

Distributor-based ignition system with electronic advance.

Components: Distributor, ignition coil, spark plug wires, spark plugs.

Specifications: Spark plug gap 0.039-0.043 inches, ignition timing 16° BTDC at 700 rpm, coil primary resistance 0.6-0.8 ohms, secondary resistance 12,000-16,000 ohms. Distributor cap and rotor should be inspected every 30,000 miles.

Cooling System

Pressurized cooling system with thermostat and electric fan.

Coolant capacity: 6.3 quarts (including reservoir)
Thermostat opening: 180°F (82°C)
Radiator cap pressure: 13-15 psi
Coolant type: 50/50 Honda All Season Antifreeze/Coolant

Tip: Always bleed air from cooling system after service to prevent overheating.

Lubrication System

Engine oil specifications and lubrication system components.

Oil type: 5W-30 or 10W-30 API SG or higher
Oil capacity: 4.2 quarts (with filter change)
Oil pressure: 50-60 psi at 3000 rpm (warm)
Oil pump: Trochoid-type, driven by crankshaft
Oil filter: Use genuine Honda/Acura filter for proper bypass pressure

WARNING! Never exceed 5,000 miles between oil changes for severe service conditions.

Electrical System

Charging and starting system specifications.

Component	Specification
Battery	12V, 45 Ah minimum
Alternator	70 amp output
Starter	1.0 kW reduction type
Fusible Links	Main 80A, Alternator 70A
Ground Locations	Transmission, thermostat housing

Torque Specifications

Critical torque values for engine components (in ft-lbs).

Cylinder Head Bolts: 45 ft-lbs + 90° turn
Main Bearing Caps: 40 ft-lbs
Connecting Rod Caps: 23 ft-lbs
Spark Plugs: 13 ft-lbs
Oil Pan Bolts: 9 ft-lbs
Timing Belt Cover: 7 ft-lbs
Water Pump Bolts: 16 ft-lbs
Flywheel Bolts: 76 ft-lbs

Troubleshooting

Symptom	Possible Cause	Corrective Action
Hard starting	Fuel pressure, spark, timing	Check fuel pressure, spark quality, ignition timing
Rough idle	Vacuum leaks, dirty injectors	Inspect vacuum hoses, clean throttle body, check EGR
Overheating	Coolant level, thermostat, fan	Check coolant, test thermostat, verify fan operation
Oil consumption	Valve seals, piston rings	Perform compression test, inspect PCV system
Loss of power	Fuel filter, timing, compression	Replace fuel filter, verify timing, compression test

Diagnostic Codes: Use paperclip method to read ECU flash codes from service connector.

Technical Support: Contact Acura dealer service department for complex diagnostics.