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Joined: Jul 2000
Posts: 242
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Joined: Jul 2000
Posts: 242 |
hey all,
Does anybody know if the IAC is normally closed or open when the engine is not running? And with the key in the on position? I belive mine is faulty, but cannot tell unless I know if its normally open or closed when the engine isnt running.
Anybody know about this or be able to go out to their car, remove the IAC tube from the intake, and blow into it?
And yes, I realize this post may get some funny answers, but I really neeed this info.
Thanks in Advance!
Jon - NJNeco
2000 Silver Frost Cougar v6 MTX
Dyno Tested 173.6 whp - 161.2 wtq
Visit MaStaMooN.Com for Details! *Back up in a limited form*
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Joined: Dec 2001
Posts: 594
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Joined: Dec 2001
Posts: 594 |
I was just looking at my fathers 95 over the weekend and I beleive the secondaries are open when the car is off. When the car is started they close and then if working correctly they will open at about 4k. this is the only thing that makes sense since they only more when the enhine is started or when they open while driving
Son - 1995 Mystique LS Zetec 5-spd --> newest "mod" -> a girlfriend by my side Father - 1995 Contour SE Duratec 5-spd Mother - 1999 Contour SE Sport Duratec 5-spd My CEG Registry My Car My Home Page
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Joined: Mar 2002
Posts: 1,040
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Joined: Mar 2002
Posts: 1,040 |
IAC closed with no power, reasoning to follow in edit.
Edit: Although no experience myself problems with IAC seem to lead to stalling, so I deduce normally closed is static situation, i.e., power off. Key in run position is different matter however since PCM would presumably be giving it some some signal in preparation for engine start.
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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Joined: Apr 2001
Posts: 1,367
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Joined: Apr 2001
Posts: 1,367 |
i believe horseydug is correct. at WOT the IAC valve should be fully opened. at idle it should be almost closed. and while off, but the key in the ignition it should probably be open waiting for you to start the car. (how far i dont know, though i would assume it would be largely open until the idle comes down when it goes to the almost closed position). why do you think your IAC is bad? what symptoms are you having? if your symptom is a high idle, go to your car and pinch the rubber hose that connects to the IAC while the car is idling high. if your rpms drop down when you do that (almost stalling) then your IAC is sticking open.
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Joined: Mar 2002
Posts: 1,040
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Joined: Mar 2002
Posts: 1,040 |
Why don't you just block off its air intake to determine how it affects idle operation?
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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Joined: Jun 2000
Posts: 1,619
Moderator
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Moderator
Joined: Jun 2000
Posts: 1,619 |
I have a 95 with the vacuum operated secondaries. They are open when the car is off. Closed once it's started. Then open when it hits 3.5K.
95 Mystique LS Young America edition, V6, MTX, Yeah...it's stock. Now with new underhood wiring!!! My Profile
Moderator of the Florida Contour Enthusiast Group
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