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Mar 25, 2002 | 09:51 AM

PAUL_2

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IAC

Mar 26, 2002 | 11:47 AM

MF15

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IAC

Still have rough idle on my 1989 5.8L, have cleaned the IAC. If I unplug it the engine dies quick. I have read many of the old posts and some say when you unplug it the engine should die quick and that is normal, other say that the engine should shudder a little while and then die. Does anyone know for sure what should happen when you unplug it and how to tell if working correctly, Thanks Mike

Mar 26, 2002 | 12:28 PM

Pastmaster

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From: Lee's Summit MO

IAC

You can test it, a local auto parts store hooked up the terminals with a 9 volt battery and if the plunger opens, it's working okay.

'93 F-150 loaded and modified!
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Mar 26, 2002 | 02:28 PM

uy7v

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From: victoria canada

IAC

i have a 1993 5.8 cant get rid of the bad idle .if i unplug my air by pass solenoid, the motor will slow down to about400 rpm but would not die.hope i find what is causing this

Mar 26, 2002 | 02:36 PM

swirk

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Joined: Aug 2001

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From: New England

IAC

I guess that I should just join the group. It seems that there are quite a few people with this problem.

Maybe a new forum... The rough Idling 5.8s.

My 351 is in a 1995 F150 and it has a rough idle. I unplug my IAC and the idle goes down a little but it doesn't stall.

I will keep a watch for a fix.

Mar 26, 2002 | 04:18 PM

bjoern

Tuned

Joined: Nov 2000

Posts: 426

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From: houston, texas (now Berli

IAC

If you unplug the IAC and it doesn't stall, you have an air leak somewhere. Most likely the upper manifold is leaking where it sits on the lower manifold, common problem.

Mar 27, 2002 | 11:19 AM

uy7v

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From: victoria canada

IAC

hey i agree rough idling 5.8 as a forum . i have sprayed carb cleaner all around lwr /upper intake and still came up empty ,tryed vacumm connections,had 2 diffrent shops try and locate they came up with either ecm or injectors .i figure the last owner gave up and sold it i may just do the same. scott

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Mar 27, 2002 | 05:39 PM

Lightning2Fast

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Joined: Feb 2002

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From: ct

IAC

when you unplug the iac it should not stall. the rpms should drop to like around 400. if your engine wont start with the iac unplugged then you need to set your hard idle. just turn the throttle stop screw a little and keep trying to start the engine. stop adjusting the screw in when the engine starts and just barely idles. now plug in the iac and your hard idle is set.