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4.2 ford e250 idle air control 1998 where?

On a 1998 Ford E250 with a 4.2L engine, the Idle Air Control (IAC) valve is typically located on the throttle body. The throttle body itself is situated on the intake manifold, near the engine's front.

To be certain, you'll need to consult a repair manual specific to your vehicle's year and engine. A diagram will show the exact location. You can usually find these manuals online (often as PDFs) or at auto parts stores. Searching for "1998 Ford E250 4.2L repair manual" should yield results.

The IAC valve is usually a small, cylindrical component with electrical connectors attached. It might be hard to spot if you're not familiar with the engine bay. Having a repair manual with diagrams will significantly help you locate it.