Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA19904RUNNER 2D UTILITY, 3.0 V, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - EFI
1990 Toyota 4Runner 2D Utility, 3.0 V, Automatic
Engine Controls - Basic Testing - EFI
1990 Toyota 4Runner 2D Utility, 3.0 V, AutomaticSECTION Engine Controls - Basic Testing - EFI
- Introduction
- Preliminary Inspection & Adjustments
- Fuel System Testing Information
- Fuel Pump Quick Test
- Fuel System Pressure Test
- Fuel Pump Control Circuit Test
- Ignition Checks (Except Supra Turbo)
- Ignition Checks (Supra Turbo)
- Idle Speed & Ignition Timing
- Summary
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.