Replace the IAC valve.,
Well, no disrespect but that IS WRONG. I am currently having this issue myself. I have replaced the IAC, AND the ECM (or some call it the PCM). Guess what? STILL SAYS IAC overspeed error!!!!! Could be anything from a bad head gasket to a vacuum leak.
P1506 - Idle Air Control System At Adaptive ClipCheck for vacuum leaks and clean the throttle body, maybe check the iat and maf sensors.
Trouble code P1506 means: Idle Air Control Overspeed Error
Trouble code P1506 means: Idle Air Control Overspeed Error
Idle Air Control Overspeed Error
Error code P1506 is for the idle air control overspeed. Remove the idle air control valve and clean it with carburetor cleaner and check for vacuum leaks. If the problem persists change the valve.
Trouble code P1506 means: Idle Air Control Overspeed Error
Trouble code P1506 means: Idle Air Control Overspeed Error
idle air control valve error.... try to clean it up
ran in to same problem with 93 escort. went to ford escort owners association (feoa.net). my problem turned out to be a vacuum leak. the forums will help narrow down problem. there is also a way to check and find out error codes on the site.
That code is an idle air control overspeed error. It means that the engine idle is out of factory specification. Sometimes the Idle Air Control may have carbon built up so clean it and if that does not fix it, replace it.
swirl control valve problem.
Error control