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Replace the idle air control valve , takes about 15 minutes to do and will save you a lot of pain and suffering . It will be the best 45.00 dollars you ever spent. When idle has returned to normal ? also check for vacuum leaks at all controls even at vac. solenoids. Hope this helps!

AnswerThis question is from me. :-)

After the engine server soon light on, I got P1506 error code . It cuased by "Idle Air Contol Overspeed Error"

The general recommend is to clear TB and check the IAC valve.

I clear the TB and check the IAC valve and loose the battery's negative terminal for half hour, then connected it and start the car let the PCM re-learning. (See pic1: http://i20.Photobucket.com/albumsb233taurusprojectpic1.jpg and pic4: http://i20.photobucket.com/albumsb233taurusprojectpic4.jpg )

But the Idle speed is around 1100 --1200 RPM. and the engine server soon light came back again.

I think the clear&check does not work.

This symptos is appear after I change it's HG. I do remember one special termial like a sense that I did not know where it should go( See pic 1: http://i20.photobucket.com/albumsb233taurusprojectpic1.jpg and pis 2: http://i20.photobucket.com/albumsb233taurusprojectpic2.jpg and pic 3: http://i20.photobucket.com/albumsb233taurusprojectpic3.jpg and pic 5: http://i20.photobucket.com/albumsb233taurusprojectpic5.jpg ).

Who know what this special part name and what function it perferm and where it should to be connected?

Anybody has any idea?

Thanks a lot for any input.

New Answer from waitingroom:

If it is not the IAC, check for vacuum leaks. Check the length of the vacuum hoses and inspect for cracks/holes. Especially check the pcv valve/hose. Basically unmetered air is coming in and the IAC can not compensate for it.

Answer from yopw11pw

I just had this problem with my 2001 Ford Windstar 3.8L error code P1506. After running the full spectrum of the Ford flow chart & any ideas I could gather from forums, I did what my dad taught me go back to the basics. The part for the fix was $8.00 & less than 10 minutes. If you look at the front of the engine there is a little black box, it is called an IMRC accuator, there 2 rods coming off of it, 1 to the front bank & 1 to the rear bank. A bushing holds the rod into the IMRC. If the bushing breaks the rod falls out. That is how I fixed my problem.

2012-06-17 01:19:26
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Q: P1506 error code Idle Air Contol Overspeed Error how cure it on 1997 windstar Gl with 3.8L engine?
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