Here are a few tests from the Ford TSP CD:
Check IAC Solenoid Resistance
* Key off.
* IAC solenoid vehicle harness connector disconnected.
* Measure solenoid resistance.
NOTE: Due to diode in solenoid, place DVOM (+) lead on VPWR pin and (-) lead on IAC pin.
* Resistance should be between 6.0 and 13.0 ohms.
Check IAC Solenoid for Proper Function
* Key on, engine running.
* Bring engine to normal operating temperature.
* Transmission in Park or Neutral.
* Disconnect IAC solenoid vehicle harness connector.
* RPM should drop or engine should stall.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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