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Old 11-13-2006, 06:14 AM   #1 (permalink)
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Default IAC valve---adjustment screw in it?

the iac valve has a hex headed screw in the rear of it . does anyone know or even reccommend adjusting this screw? my cold idle is too high. vehicle runs smooth , just that cold idle is too high and stays that way too long in my opinion.
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Old 11-13-2006, 11:35 AM   #2 (permalink)
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never mind, took it off cleaned it up put it back on and tweeked with screw to see how it responds. cold idle now at 1500 rpm smooooth . slow staedy drop down to 800 in a couple mins. and is super smoooooooth now. screw tightened means lower cold idle speed and shorter duration. screw loosened means higher cold idle and longer duration.
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Old 11-13-2006, 03:22 PM   #3 (permalink)
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Talking Cool!

Excellent Info!

Thanks!
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Old 04-28-2007, 10:14 PM   #4 (permalink)
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what did you use to clean it,
?

thanks for this nfo. !

I pulled mine (91kick) stroked the spring while blasting with carb cleaner (mek ! nasty stuff) and it idles perfect , after fixing 5 air leaks.
"EGR bolts loose = 1 leak", IAC mount loose, 3 hoses with cracks.
now, car idles like new. (5mm hex screw pointing forward)

This is our #3 beater car, it will be mech. perfect by end of june.
all new brakes , clutch , tranny rebuild, hoses,belts, tuneup kit, etc.
New rotors, new wheel bearings. $500 total on parts, free labor.
No rust, not a drop (thanks to no salt here)

We have 2 roadsters and will use this to fetch items, like plants , groceries, car parts, etc.

with the rear seat out and back top off, you can carry huge stuff.
in fact it is an amazing machine. ( like a mini pickup, then presto 4 passengers , dang !)
It will be the snow day car.

I put in the capacitor upgrade to the ECM. (PCM sae jargon).

My only gripe is the huge expense of new head lights! wow.
mine are fogging.

OFFER:
If some one has a pdf shop manual (i have crappy samarai) I will trade you for my full factory 5sp tranny manual.
I will electroncially mail it to you. or give you an upload secret page on my server.
PM ME ?

If you have any problems , esp. electrical , let me know.

summer project.

Last edited by jtgh; 05-16-2007 at 07:49 PM.
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Old 05-17-2007, 06:21 PM   #5 (permalink)
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Default Idle Air Controller , themo type.

see photo of the IAC (idle Air control valve)

Last edited by jtgh; 07-26-2007 at 12:52 PM.
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Old 05-17-2007, 06:35 PM   #6 (permalink)
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Default Idle Air Controller , themo type.

theory of op.'s:
When coolant temp. is low, this valve leaks air into the
intake plemum and cause fast idle. (in fact all times)
as the water warms the wax pellet inside the valve closes until 800 rpm is reached.
the trick is that you must set it hot to 800.

but if you dont like the cold high idle , you must choose a compromise.

or buy a very expensive new one. ( and pray)

that adjustment is just a simple 5mm Allen wrench hex socket screw.

hope this helps.

a little history.
on newer cars (kicks and trackers) this valve evolved to a motor that the ECU controls.
The ECU then sets the idle based on temperature, and load. It can even raise the idle when the A/C is switched on.

But this old one works like an old Choke but uses Air Instead ( crude as it is).
The ECU sees the extra air and addes more fuel.
then end effect is cold enrichenment.
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Old 07-18-2007, 03:33 PM   #7 (permalink)
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Don't suppose you could post a pic of this IAC valve mounted in the car could you?

Thanks
Tracy
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Old 07-18-2007, 06:19 PM   #8 (permalink)
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look up three lines see photo attachment.
the real deal
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Old 07-19-2007, 08:11 PM   #9 (permalink)
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Thanks but where do I find it?
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Old 07-20-2007, 12:21 AM   #10 (permalink)
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What car and engine do you have? Not all have an IAC. Tracka
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