high idle question
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Elder User
Joined: Mar 2003
Posts: 589
Likes: 3
From: Villa Rica, GA
high idle question
this morning when i got to school my bronco was idling at like 2000 rpms and it would not kick down. its an '87 and has a straight 6. i shut it off and started it back up and still the same thing. so i popped the hood to see if the throttle linkage was stuck or something but it wasnt, i pulled the intake pipes off the TB and the butterflies were totally shut (with the truck off) so i know they arent stuck open. is there a sensor or something that will make it idle that high? it never idles that high even when first starting it on a cold morning. could it be the coolant temp sensor going bad and making it idle high? anything i can unplug or check to try to figure out whats goin on?
thanks for any help, Jason
thanks for any help, Jason
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
high idle question
Its possible that your idle air control motor is going, or has gone bad, or either your throttle position sensor is ba d, causing the high idle.
Or it could be the coolant temp sensor, but that would also cause a rich running condition.
Other than that, the only thing i can think of that would cause the high idle, is your lower intake gasket has slipped or has been sucked partially into the plenum, causing the leak.
Or it could be the coolant temp sensor, but that would also cause a rich running condition.
Other than that, the only thing i can think of that would cause the high idle, is your lower intake gasket has slipped or has been sucked partially into the plenum, causing the leak.
Posting Guru
Joined: Feb 2001
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From: Keweenaw Bay, MI
high idle question
The first thing I would do is take that idle air control valve apart and clean it. You will probably find that this is the problem unless you have a vacuum leak somewhere.
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Elder User
Joined: Mar 2003
Posts: 589
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From: Villa Rica, GA
high idle question
ok i cleaned out the IAC, there was a ton of **** packed in there. it fixed the high idle problem .. now its idling kinda low .. like 750-800 but ill jus turn it up a lil and it will be fine.
another thing ... theres 2 vac lines that come out of the top of the TBs right by the IAC, they have a Y and go into one which runs across the intake to the passenger side. where is that suppose to connect to? its just hanging there and i know it shouldnt be.
-Jason
another thing ... theres 2 vac lines that come out of the top of the TBs right by the IAC, they have a Y and go into one which runs across the intake to the passenger side. where is that suppose to connect to? its just hanging there and i know it shouldnt be.
-Jason
Posting Guru
Joined: Feb 2001
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From: Keweenaw Bay, MI
high idle question
It is supposed to plug into your carbon (charcoal) canister down below the battery.
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Elder User
Joined: Mar 2003
Posts: 589
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From: Villa Rica, GA
high idle question
aight thanks .. that was it. theres another line comin out of that charcoal box .. that goes to the gas tank .. right? anyway its rusted off .. it wont hurt anything will it? besides the ozone?
Last edited by chuck641; May 13, 2003 at 04:14 PM.
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Thread Starter
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Elder User
Joined: Mar 2003
Posts: 589
Likes: 3
From: Villa Rica, GA
high idle question
thanks man ... i noticed that when i went out there . i had never paid attention to it before ... i changed my last post. do u have an answer for that other question? and i think ill be done after that 
ill throw a chunk of rubber hose over the broken pipe tomorrow.
ill throw a chunk of rubber hose over the broken pipe tomorrow.
Posting Guru
Joined: Feb 2001
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From: Keweenaw Bay, MI
high idle question
It will only allow your gas tank to vent to the atmosphere. Other than maybe drawing moisture into your tank as it empties, like real humid air that will condense when it gets cooler, forming moisture in your tank.
Post Fiend
Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
high idle question
It doesn't vent to the atmosphere - it pulls fresh air in through those vents when the purge solenoid opens (only while the engine is running), to clear the vapor that was stored in the charcoal when the engine was off & pressure built up in the tank. The only air that goes into the tank comes in thru the gas cap, if the fuel pump pulls a vacuum on it.