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Answer I have a 02 ford escape, and it is doing the same thing your ford escort doing.( overspeed error.) well anyway I was told it is a faulty vaccum harness tube assemby. haven't tried it yet, but thats on the list. cause I've tried everything.

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.

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Q: What can you do to fix problem with code p1506 idle air control overspeed error in a 1999 Ford Escort?
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