IAC questions
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Freshman User
Joined: Jul 2014
Posts: 49
Likes: 0
From: British Columbia
IAC questions
i found that my idle air control solenoid was the route to the majority of my problems and was curious on how i could possibly bench test it or clean it and possibly make it work.. or test one from the wreckers thnx.
Lead Driver
Joined: Feb 2002
Posts: 7,970
Likes: 595
From: Greater Austin, Texas
I personally have never bought a new one. I clean em with throttle body cleaner and and old toothbrush - take it off the truck to do this. If you are gonna buy a new one, be sure to get a Motorcraft. The other replacements are junk in my experience.
Disconnect the battery while cleaning or replacing so you reset the computer. I can then take up to a week for the computer to re-learn the idle.
Disconnect the battery while cleaning or replacing so you reset the computer. I can then take up to a week for the computer to re-learn the idle.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Yup, I bought a new one, didn't work any better then the old one.
Remove the old one, take it apart(two small screws)---mark the orientation of the two pieces by scribing them with screwdriver. Clean the valve portion with brake clean and blow it dry. Then do the same with the soleniod portion. Then a touch of PB blaster or such to lubricate it. You should be able to shake the soleniod and have it rattle easily.
Put it back together and install it.
I made the mistake of using oil to lubricate the soleniod, but when it got cold outside it would stick and not work right. I cleaned and used PB on it and it has worked flawless all winter(-20 weather).
Remove the old one, take it apart(two small screws)---mark the orientation of the two pieces by scribing them with screwdriver. Clean the valve portion with brake clean and blow it dry. Then do the same with the soleniod portion. Then a touch of PB blaster or such to lubricate it. You should be able to shake the soleniod and have it rattle easily.
Put it back together and install it.
I made the mistake of using oil to lubricate the soleniod, but when it got cold outside it would stick and not work right. I cleaned and used PB on it and it has worked flawless all winter(-20 weather).
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Some good info here:
IAC Cleaning - FSB Forums
Fuel Injection Technical Library » Idle Air Bypass (IAB)
IAC Cleaning - FSB Forums
Fuel Injection Technical Library » Idle Air Bypass (IAB)
Lead Driver
Joined: Dec 2012
Posts: 7,877
Likes: 49
From: Tennessee
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Freshman User
Joined: Jul 2014
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From: British Columbia
well i hosed it in carb cleaner and she runs prime now i finally got the 302 to idle at 600 and nicely lol.... it was gummed up with old dirty oil from my pcv that was leaking into my intake and making it smoke blue at high rpm's so 2 birds with one stone lol thnx guys cheers
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Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
well i hosed it in carb cleaner and she runs prime now i finally got the 302 to idle at 600 and nicely lol.... it was gummed up with old dirty oil from my pcv that was leaking into my intake and making it smoke blue at high rpm's so 2 birds with one stone lol thnx guys cheers
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Freshman User
Joined: Jul 2014
Posts: 49
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From: British Columbia
so the iac completely ***** itself and now it wont stay running with it plugged in but if i unplug it the truck starts rough but runs smooth. and i priced out the IAC solenoid and damn its steep its $200 after taxes so i was wondering how to bench test one at the wreckers
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
so the iac completely ***** itself and now it wont stay running with it plugged in but if i unplug it the truck starts rough but runs smooth. and i priced out the IAC solenoid and damn its steep its $200 after taxes so i was wondering how to bench test one at the wreckers
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Freshman User
Joined: Jul 2014
Posts: 49
Likes: 0
From: British Columbia
lol lordco 
summit racing is $39.99 plus like $20 in shipping and handling and then the U.S. to Canadian conversion so i'm in at least $70 but i might be able to find a newer one at the wreckers
summit racing is $39.99 plus like $20 in shipping and handling and then the U.S. to Canadian conversion so i'm in at least $70 but i might be able to find a newer one at the wreckers