From the Ford TSP (Technical Service Publication): In reply to:
Diagnostic Trouble Code (DTC) P1506 indicates Self-Test has detected an IAC overspeed error.
Possible causes: -- IAC circuit short to GND. -- IAC assembly stuck open. -- Vacuum leak. -- Damaged IAC assembly. -- Damaged throttle body. -- Damaged PCM.
* Key on, engine running. * With the engine at idle, listen for vacuum leaks. * Inspect the entire inlet air system from the Mass Air Flow (MAF) sensor to the intake manifold for damage or leaks such as: * Cracked or punctured inlet air tube. * Loose inlet air tube at the air cleaner housing or throttle body. * IAC valve assembly or gasket seal. * Intake manifold assembly or gasket seal. * EGR valve gasket seal. * Vacuum supply connectors and hose. * PCV valve, connectors and hose.
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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