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Where is the idle control valve on 1997 Mercury Mystique 2.0 engine?

The Idle Air Control (IAC) valve on a 1997 Mercury Mystique with a 2.0L engine is located on the throttle body. It's usually a small, cylindrical component mounted on the side or top of the throttle body itself. It's often connected by a single electrical connector.

To be certain, you'll need to consult a repair manual specific to your 1997 Mercury Mystique 2.0L engine. A picture in the manual will definitively show its location. You can often find these manuals online (some are free, others are paid) or at auto parts stores.

Looking at diagrams or pictures online for a 1997 Mystique 2.0L engine's throttle body will also help you identify it visually once you've located the throttle body itself.