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It.s under the plenum (that's the big silver thing) near the back. Don't replace or service it unless you have pinging or have failed emissions on the NOX test.

you only need to replace the EGR if the vacuum diaphragm inside is broken. you can check it with a vacuum gun. another reason to service valve is a bad sensor or carbon build up on the pintle.

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Q: Where is the EGR valve on a '91 Aerostar 3.0?
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