I've tried desperately a number of times to locate the screw on my throttle body so that I can set my idle speed. Unfortuately, I have had no such luck in the matter. Could someone, using simple english, explain to me how to find the thing. No, I'm not stupid, just a bit cursed...

 

Its on the drivers side of the throttle body on the top...i dont remember what bit it uses to adjust though


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Flowmaster 80 series, Random Technologies Cat, 3" intermediate pipe, SS
Hand Made Tips, 3 1/4" out, Accel 8.8 wires, MSD Coil, MSD Ignition Module,MSD 6A Box, Air Intake Temp Guage, Brushed Aluminum Hood Pins
Currently Working On:
T5 swap
Next to buy:
Slp dual cold air intake!

 

Oh, so that's where that little SOB is...man, I've been looking for it for months now, turns out it was covered by a retarded little metal cap that I have to punch out. Stupid GM...

 

don't even bother dude. your idle speed is computer controlled. if you move the screw, the computer will just adjust to the change.

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Dan
1990 3.1L RS
80 Series Flowmaster
It's fast(er than a 3 cyl metro)

 

Yes, if you do things that way, the computer will compensate. You have to set it when the car is running, but the connector for the computer bit has to be undone. Then, you sort of set a "minimum" idle speed. The computer can't do a damned thing about it then, if it's not hooked up! Read the article in thirdgen.org under tech articles, it'll make things a lot simpler. Thanks for the help.

 

You use a Torx 15 bit to turn it. Also, about the computer thing, it cannot totally adjust for you setting the screw. Think about it - if you put the screw all the way out so the throttle is at WOT, there sure as hell is nothing you computer can do to keep your car from running at WOT. The throttle is connected to the throttle plate, which governs air flow into the intake. Whatever you set your idle to, that is how much air is coming in, which causes a lean mixture if your computer doesn't adapt, so the computer is forced into letting more fuel in. The only thing to computer will do if you change your idle screw position is compensate for the higher/lower amount of air coming in.

Vman

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1969 Camaro
383, Corvette heads, 700R4
Resto is in progress

1988 Toyota 4-Runner
aka the Parts Hauler

 

Correct me if I'm wrong, but that's not a good example.. idle speed affects the computer, because it decides how far to move the IAC valve. If you open the throttle stop more than it should be, the computer will close the IAC valve more.

You're right on one thing, if the idle was set to WOT the computer couldn't do anything. It would probably seat the IAC valve closed.

I think the danger of idle-speed-setting without doing the proper procedure (computer knows what's up) is that you can have the throttle blades closed too much, and the computer won't try to open up the IAC as far as it should- meaning a very poor idle.

Or, vise-versa, I suppose.. the blades could be adjusted too far open, and the computer still opens the IAC valve as always- and the idle's too high.

One thing that confuses me though- if the throttle stop is plugged over, to prevent movement & tampering, shouldn't the car always have a perfect idle when doing the IAC-reset-procedure?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

I tried to set mine it just got worse so i just opened it til the car sounded ok.. and me bein the stupid person i am figured the idlespeed changes from park to drive so i had the car in drive but blocked off well lets say it hopped the block and i had my car run into me then hit the wall in the grage thank god gfor our flexable bumpers

 

Thanks for clearing that up, Tom. I just made a hypothesis regarding what I already knew, as well as some plain ole logic! I had no idea there was an IAC valve, let alone what it did. Sorry I got it wrong. Maybe that was why my car had so many problems when my stepdad decided to use the idle screw to set the idle speed.
LOL @ FastRS - that sucks, but it is funny!!!


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1969 Camaro
383, Corvette heads, 700R4
Resto is in progress

1988 Toyota 4-Runner
aka the Parts Hauler

 

hrmm i set my idle speed a few times with the screw, and didnt have any problems.. as you shouldnt unless you say, crank your idle up to 1500 rpm or so.. if i recall correctly proper idle speed is 800 rpm in park..