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.
1993 Geo Metro Base, 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE
Idle Air Control Valve
- Idle Air Control (IAC) valve is located below left side of air cleaner. IAC valve by-passes air around throttle valve and directly into intake manifold. Air is allowed to pass through IAC valve when valve is energized by ECM.
- IAC valve is energized whenever idle speed drops to less than desired RPM due to engine load (i.e., electrical, P/S, A/T in Drive, etc.). IAC valve is energized each time engine is started and during periods of deceleration to compensate for rich mixtures caused by a fully closed throttle. Other information is not available from manufacturer.
Factory Service Tools
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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.
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