Originally Posted by GUM85
I guess you can test it electrically but not mechanically. Autozone's web site says to test the IAC on 2000-2005 focus disconnect the two pin electrical connector, using a digital multimeter do a resistance test at the two pins on the IAC valve electrical connector and you should get a reading between 6-15 ohms if the reading is out of that range replace the valve. I did this test on the IAC valve on my car and got a 0 ohms reading. If I did it correctly than my IAC valve is no good. I just don't understand why it would run worse after I took it off and cleaned it.
You could have logged the "gunk" in where the piston screw is causing it to not work properly anymore.
If any of you guys have suffered the vlv drop issue I have lots of good used OEM piston and rod assemblies if you need any, just PM me.