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 MANUALSTOYOTA1990PICKUP BASE, 22RREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 4-CYL CARBURETEDAIR SUCTION SYSTEMHOT AIR INTAKE (HAI) SYSTEM
1990 Toyota Pickup Base, 22R
Hot Air Intake (HAI) System
1990 Toyota Pickup Base, 22RSECTION Hot Air Intake (HAI) System
- Remove air cleaner. On Pickup, cool thermostatic valve. On Corolla and Tercel, cool Hot Idle Compensator (HIC) valve. Start engine. Check that air control valve closes cool air passage at idle.
- Reinstall air cleaner cover. Start and warm engine. Check that air control valve opens cool air passage at idle. See Fig 2, Figure or Figure. Visually check hoses and connections for cracks, leaks and damage.
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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.