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, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EFIIDLE CONTROL SYSTEMAUXILIARY AIR VALVE SYSTEMWITH 22R-E
1990 Toyota 4Runner 2D Utility, 3.0 V, Standard
With 22R-E
1990 Toyota 4Runner 2D Utility, 3.0 V, StandardSECTION With 22R-E
- Engine must be cold to perform test. Install tachometer to engine. See appropriate ADJUSTMENTS article for tachometer attaching points.
- Start engine. Turn idle speed adjusting screw to bottom of its travel. Engine RPM should drop slightly when coolant temperature is below 176°F (80°C).
- Back out idle adjusting screw. Warm engine to normal operating temperature. Turn idle speed adjusting screw to bottom of its travel. See Fig 1. Engine should idle roughly or die as idle speed adjusting screw is seated.
- If engine RPM does not drop during step 2 or 3 , check for vacuum leaks after the valve or restricted chamber in auxiliary air valve circuit. Replace valve if defective.
RENDER: 1.0x
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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.