1988 4Runner Manual

The 1988 Toyota 4Runner is a versatile 4x4 SUV featuring a 2.4L 4-cylinder engine, 5-speed manual transmission, part-time 4WD system, rear-wheel drive capability, manual locking hubs, and durable body-on-frame construction. This manual covers operation, maintenance, specifications, and troubleshooting for the 1988 model year. Below are key sections for features, operation, maintenance, specifications, and troubleshooting.

Features at a Glance

Key components: 2.4L 22R-E engine, 5-speed manual transmission, part-time 4WD system, manual locking hubs, removable hardtop, rear fold-down seats.

Feature	Description
Engine	2.4L 22R-E 4-cylinder fuel-injected
Transmission	5-speed manual
4WD System	Part-time with manual locking hubs
Drive Modes	2WD, 4WD High, 4WD Low
Body Style	SUV with removable fiberglass top
Seating Capacity	5 passengers
Cargo Space	Rear fold-down seats for expanded storage
Fuel System	Electronic fuel injection
Suspension	Front independent, rear leaf spring
Brakes	Front disc, rear drum

Vehicle Operation

Familiarize yourself with controls before driving.

1. Starting: Insert key, depress clutch, turn ignition.
2. Shifting: Use clutch pedal for smooth gear changes.
3. 4WD Engagement: Stop vehicle, shift transfer case, lock front hubs manually.
4. Parking: Engage parking brake on inclines.

WARNING! Do not engage 4WD on dry pavement. Always come to complete stop before shifting between 2WD and 4WD.

First-Time Setup

Initial vehicle inspection and preparation.

1. Fluid check: Verify engine oil, coolant, brake fluid levels.
2. Tire pressure: Inflate to recommended PSI (see door jamb).
3. Battery: Check terminals for corrosion.
4. Lights: Test headlights, turn signals, brake lights.
5. 4WD system: Practice engagement/disengagement in safe area.

CAUTION! Always perform pre-drive inspection. Never operate vehicle with warning lights illuminated.

Specifications

• Engine: 2.4L 22R-E 4-cylinder, 116 hp @ 4800 rpm
• Transmission: 5-speed manual
• Transfer Case: Part-time 4WD, 2-speed
• Drivetrain: Rear-wheel drive, selectable 4WD
• Fuel Capacity: 17.2 gallons
• Towing Capacity: 3,500 lbs
• Ground Clearance: 8.7 inches
• Curb Weight: 3,650 lbs
• Wheelbase: 103.0 inches
• Overall Length: 174.0 inches

Controls and Settings

Dashboard controls: Ignition, headlights, wipers, climate control.

Instrument Cluster: Speedometer, tachometer, fuel gauge, temperature gauge, warning lights (oil, battery, brake).

4WD Controls: Transfer case shifter (2H, 4H, 4L), manual hub locks. Climate: Manual heating/ventilation system. Audio: AM/FM radio (optional cassette). Lighting: Headlight switch, dimmer, turn signal stalk.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

1. Oil change: Every 3,000 miles or 3 months
2. Filter replacement: Air filter every 15,000 miles, fuel filter every 30,000 miles
3. Tire rotation: Every 6,000 miles
4. Brake inspection: Every 12,000 miles
5. Coolant flush: Every 30,000 miles
6. Spark plugs: Every 30,000 miles
7. Timing chain: Inspect at 60,000 miles

Tip: Keep detailed maintenance records for warranty and resale value.

4WD System Operation

Proper use of part-time 4WD system.

1. 2WD mode: For normal dry pavement driving.
2. 4H engagement: Stop vehicle, shift transfer case to 4H, exit vehicle and turn hub locks to LOCK position.
3. 4L engagement: Come to complete stop, shift transmission to neutral, shift transfer case to 4L.
4. Disengagement: Reverse engagement procedure.
5. Manual hubs: Always lock/unlock when stationary.

WARNING! Never operate in 4WD on dry pavement. Avoid high-speed operation in 4L mode.

Safety Features

Standard safety equipment: 3-point seat belts, collapsible steering column, side impact protection, rear window defroster.

Care & Cleaning

Exterior: Wash with mild soap, avoid abrasive cleaners. Interior: Vacuum regularly, use vinyl protectant. Undercarriage: Rinse after off-road use to remove mud and debris.

CAUTION! Do not use high-pressure spray on wheel bearings or electrical components. Avoid wax on matte black trim.

Regulatory Information

Manufactured by Toyota Motor Corporation. Meets 1988 FMVSS standards. EPA estimated MPG: 18 city/21 highway. California emissions certified. VIN located on dashboard visible through windshield. For service, contact authorized Toyota dealerships.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Hard starting	Fuel filter, spark plugs	Replace fuel filter; check spark plugs and wires; verify fuel pressure.
4WD won't engage	Vacuum lines, hub mechanism	Check vacuum lines to front axle; inspect hub lock mechanism.
Transmission grinding	Clutch adjustment, fluid level	Adjust clutch pedal; check transmission fluid; inspect synchronizers.
Overheating	Coolant level, thermostat	Check coolant level; test thermostat; inspect radiator for blockage.
Brake pulsation	Warped rotors	Resurface or replace front rotors; check brake calipers.

Reset: Disconnect battery for 30 minutes to reset ECU if needed.

Service: Contact authorized Toyota service center for major repairs.