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International Automotive Technicians Network
Re: 1991 Ford F-250
Posted to Technical Discussion Forum on 12/16/2003

Jarrod, please include the engine size or 8th digit of the VIN when you get back to us. I assume you are referring to the two wire Idle Air Control valve mounted on the throttle body. If so, one test that you can perform: Take a digital multi-meter on DC V set... Login to read more.