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Testing IAC valve


 
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rtlofishing
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Joined: 08 Nov 2006

PostPosted: Fri Nov 10, 2006 8:29 pm    Post subject: Testing IAC valve Reply with quote

I have pretty much narrowed my idle problem to the IAC...Going by the book it tells me if i unplug the IAC to test,it will set a check engine light..Going by the book I unplugged it when warm and didnt notice any change in idle or running and no check engine light...Now I am really confused.....
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Sat Nov 11, 2006 8:30 am    Post subject: Reply with quote

The best way to test an IAC is with a computer scanner, but most people don't have one. There's a stand alone tool designed for testing IAC's. It's called an IAC stepper/excersizer tool part Miller Tools part#7558. It's basically an On/Off/On switch that tests the IAC. The link below shows how it works. OTC makes a universal IAC tester, but it's expensive. Call Autozone and see if they have one for rent, or if they have the equipment to test the IAC.
But before you get into that, remove the IAC and check the IAC tip and port for carbon build up. A lot of times carbon deposits keep the IAC from seating properly. Also check for vacuum leaks. I had an IAC problem with my S-10. I pulled the IAC out, and sure enough the IAC tip, and port were packed full of carbon. I cleaned the tip and port with brakleen, no more issues, and it runs fine now.
IAC test procedure:
https://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/10/11/c9/0900823d801011c9.jsp
IAC tester:
http://www.usatoolwarehouse.com/spx-store/otc-3320.html
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